TW202140164A - Manufacturing method of bottomed cylindrical body - Google Patents

Abstract

The present invention provides a method for manufacturing a bottomed cylindrical body, which can take into account the strict can-making processing such as conventional drawing and ironing, as well as cost reduction or environmental load reduction in the cleaning step. The present invention is a method for manufacturing a bottomed cylindrical body, which is characterized in that it includes: a drawing step, using a formed member with a processed surface hardness Hv of 1500 to 12000 to draw a metal plate; and a shrinking step, using processing The forming and processing member with carbon film on the surface is processed by shrinking and shrinking the processed member through a refrigerant to form a bottomed cylindrical body; and the above-mentioned refrigerant is a water-soluble refrigerant or a refrigerant with a boiling point of less than 300°C. Alternatively, the present invention is a method for manufacturing a bottomed cylindrical body, which is characterized in that it includes: a drawing step, using a drawing die with a processed surface hardness Hv of more than 1500-12000 and a drawing die with a Hv of 1000-12000 The head performs deep-drawing processing on the metal plate; and the shrinking step, using a formed member with a processed surface hardness Hv of 1500 to 12000, and shrinking and shrinking the processed member through a refrigerant to form a bottomed cylindrical body; and the above-mentioned refrigerant Meet at least any one of the following (a) to (c): (a) the concentration of the oil content does not reach 4.0% by volume; (b) the water-soluble refrigerant; or (c) the boiling point does not reach 300°C.

Description

Manufacturing method of bottomed cylindrical body

The present invention relates to a method of manufacturing a bottomed cylindrical body, and more specifically, to a method of manufacturing a metal bottomed cylindrical body by drawing and ironing.

A metal bottomed cylindrical body, such as a so-called seamless can system, is manufactured by drawing and shrinking using a die for press processing.

The punches and die heads used in the above-mentioned drawing and shrinking process are generally placed in a harsher environment. Therefore, for example, molds as shown in Patent Documents 2 to 5 have been proposed. That is, it has been proposed to coat the processed surface with a carbon film such as a diamond film or a DLC (Diamond Like Carbon) film to improve the durability of the mold.

On the other hand, in the past, for example, when an aluminum alloy material is used to manufacture a seamless can body, a lubricant or a coolant (refrigerant) is generally used for forming in a humid environment. In this case, after the can-making process, a washing step (washing step) is indispensable, which uses a detergent or a chemical to wash the processing oil, lubricant, refrigerant, etc. attached to the can body. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 6012804 [Patent Document 2] Japanese Patent Application Laid-Open No. 10-137861 [Patent Document 3] Japanese Patent Application Laid-Open No. 11-277160 [Patent Document 4] JP 2013-163187 A [Patent Document 5] International Publication No. WO2017/033791

[The problem to be solved by the invention]

However, the above-mentioned conventional seamless tank manufacturing method has the following problems: the cleaning step requires a lot of energy or cost, or the environmental load is large.

For example, the following requirements are proposed: reduce the cost or environmental load related to the large amount of water used in the washing step; reduce the environmental load caused by the chemicals used in the washing step; and reduce the use of detergents in the washing step Energy required for heating, etc.

Furthermore, this time the inventors have carried out intensive research and found that when a bottomed cylindrical body is manufactured using a refrigerant under specific conditions, it is possible to take into account the conventional drawing, ironing, etc. Strict processing and cost reduction or environmental load reduction in the cleaning step have completed the present invention. [Technical means to solve the problem]

In order to achieve the above-mentioned object, the method for manufacturing a bottomed cylindrical body in one embodiment of the present invention is characterized in that (1) includes: a drawing step, using a formed member with a processed surface hardness Hv of more than 1500-12000 to metal The plate is subjected to deep drawing processing; and the shrinking step, using a shaped processing member with a carbon film on the processing surface, and shrinking the processed member through a refrigerant to form a bottomed cylindrical body; and the above-mentioned refrigerant is a water-soluble refrigerant, and/ Or refrigerant with a boiling point of less than 300°C.

The above (1) preferably, (2) the bottomed cylindrical body is a seamless tank. Furthermore, it is preferable that (1) or (2) above is that (3) the above-mentioned metal plate is an aluminum alloy. Furthermore, it is preferable that any one of (1) to (3) above is that (4) the above carbon film is a diamond film.

Preferably, any one of (1) to (4) above is that (5) includes a lubricant coating step. Lubricants and/or lubricants with a boiling point of less than 300° C. are coated on the above-mentioned metal plate, and the hardness Hv of the processed surface of the formed member in the above-mentioned drawing step is 1500-12000.

Preferably, in any one of (1) to (5) above, (6) the above-mentioned refrigerant contains an anticorrosive agent and/or a rust preventive agent.

The method of manufacturing a bottomed cylindrical body in an embodiment of the present invention preferably further includes a cleaning step in any one of (1) to (6) above (7), which removes the attachment to Lubricant and/or refrigerant on the surface of the above-mentioned bottomed cylindrical body.

The method for manufacturing a bottomed cylindrical body in an embodiment of the present invention preferably further includes a purification step in any one of (1) to (7) above (8), and the purification step affects the shrinking step. And/or the discharged water discharged in the washing step is purified.

In order to achieve the above object, the method for manufacturing a bottomed cylindrical body in another embodiment of the present invention is characterized in that (9) includes: a drawing step, using a drawing die with a processed surface hardness Hv of more than 1500-12000 And the drawing punch with Hv of 1000～12000 to deepen the metal plate; and the shrinking step, using the processed part with the hardness of the processed surface Hv of 1500 to 12000, and the processed part is made by shrinking the processed part through the refrigerant. A bottomed cylindrical body; and the above-mentioned refrigerant satisfies at least any one of the following (a) to (c): (a) the concentration of oil contained does not reach 4.0% by volume; (b) water-soluble refrigerant; or ( c) The boiling point does not reach 300°C.

The above (9) preferably, (10) the bottomed cylindrical body is a seamless tank. In addition, it is preferable that the above-mentioned (9) or (10) is that (11) the above-mentioned metal plate is an aluminum alloy.

Any one of the above (9) to (11) is preferably that (12) the processed surface of the forming processing member in the above drawing step and/or the processing surface of the forming processing member in the above shrinking step is formed with Carbon film.

Any one of the above (9) to (12) preferably, (13) includes a lubricant coating step, which is to coat the lubricant on the surface of the metal plate before the drawing step , And the hardness Hv of the processed surface of the drawing die in the above drawing step is 1000～12000.

Preferably, any one of (9) to (13) above is that (14) further includes a purification step that performs the purification step on the discharged water discharged in the above-mentioned shrinking step or the washing step after the above-mentioned shrinking step Purification. [Effects of the invention]

The method for manufacturing a bottomed cylindrical body according to the present invention includes the following steps: performing shrinking processing using a forming processing member (such as a punch and a die) with a carbon film on the processing surface.

Therefore, even when a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300°C is used as the refrigerant used in the shrinking step, a bottomed cylinder with the same or higher shrinkage rate can be obtained.状体。 Shape body.

In addition, the method for manufacturing a bottomed cylindrical body according to the present invention includes the following steps: deep drawing is performed using a shaped processed member (such as a punch and a die) whose surface hardness is greater than a predetermined value. Therefore, the lubricant coating step of coating the lubricant on the surface of the metal plate (flat plate) before deep drawing can be omitted.

In addition, the present invention may also have the following steps: before the deep drawing process, a water-soluble lubricant and/or a lubricant with a boiling point of less than 300° C. is applied to the surface of the metal plate (flat plate). In this case, even if the lower limit of the hardness of the processed surface of the formed member in the drawing step is reduced, the same or higher processability can be obtained as before.

Furthermore, according to this embodiment, water-soluble lubricants or refrigerants, and lubricants or refrigerants with a boiling point of less than 300°C are used in the drawing step and the shrinking step. Therefore, in the washing step, it is not necessary to use a detergent. Use water or hot water for washing. Alternatively, the concentration of the cleaning component in the cleaning agent can be reduced. Alternatively, a washing step may not be provided, and after the can-making process, the lubricant, refrigerant, etc. adhering to the can body may be dried and removed. Therefore, it is possible to reduce the environmental load or reduce the cost in the cleaning step.

In addition, the method for manufacturing a bottomed cylindrical body according to the present invention includes the following steps: drawing processing and shrinking processing using formed processing members (such as punches and dies) whose surface hardness is greater than a predetermined value. Therefore, in the shrinking step, when using at least one of (a) the concentration of the oil contained in it does not reach 4.0% by volume, (b) a water-soluble refrigerant, or (c) a refrigerant with a boiling point below 300°C At the same time, a bottomed cylindrical body with the same or higher shrinkage rate as in the past can be obtained.

Moreover, according to this embodiment, the step of applying processing oil or lubricant to the surface of the metal plate (flat plate) before the drawing process can be omitted. In addition, as the refrigerant used in the shrinking step, at least any one of (a) the concentration of the contained oil is less than 4.0% by volume, (b) the water-soluble refrigerant, or (c) the boiling point is less than 300°C can be used Item of refrigerant. Therefore, in the washing step, water or hot water can be used for washing without using a detergent. Alternatively, a washing step may not be provided, and after the can-making process, the lubricating component, refrigerant, etc. adhering to the can body may be dried and removed. Therefore, it is possible to reduce the environmental load or reduce the cost in the cleaning step.

[Method of manufacturing bottomed cylindrical body] The applicants of the present invention have discovered the manufacturing method of seamless can bodies as disclosed in Japanese Patent Application No. 2018-204896 and Japanese Patent Application No. 2018-204823. That is, it was discovered that when using a mold with a diamond film with high sliding characteristics formed on the processed surface, and the oil in the refrigerant is set to a predetermined amount or less for press processing, even if strict processing such as shrinking processing is performed , It also obtains the processing degree (such as the limit shrinkage rate) that is equal to or higher than that of the stamped products made by using the previous amount of lubricant. Furthermore, this time the inventors discovered a method for manufacturing a bottomed cylindrical body related to the above-mentioned method for manufacturing a seamless can body.

Hereinafter, the manufacturing method of the bottomed cylindrical body of the present invention will be specifically described with reference to the drawings as appropriate. In addition, the following embodiments show an example of the present invention and explain the content thereof, and do not intend to limit the present invention. In addition, in the following embodiments, a seamless can body is cited as an example of a bottomed cylindrical body for description, but the present invention is not intentionally limited.

(First Embodiment) First, the manufacturing method of the bottomed cylindrical body of the first embodiment will be described. Fig. 1 is a schematic diagram showing the drawing step in the manufacturing method of the bottomed cylindrical body of the first embodiment. 2 is a schematic diagram showing the shrinking step in the manufacturing method of the bottomed cylindrical body of the first embodiment. Furthermore, FIG. 3 is a schematic diagram which shows the flow of the manufacturing method of the bottomed cylindrical body of 1st Embodiment.

＜Metal plate＞ The metal plate as the material to be processed in this embodiment is not particularly limited as long as it is a metal plate used in general metal press processing. For example, aluminum, copper, iron, steel, and titanium can be applied. Furthermore, not only pure metals but also various known metal plates such as alloys thereof can be applied. Among them, in the case of forming a seamless can body, an aluminum alloy plate is particularly suitable.

The thickness of the metal plate in this embodiment is not particularly limited, and the usual thickness when manufacturing seamless cans can be applied. For example, as an example of the thickness of the metal plate when an aluminum alloy plate is used for can-making processing, the original plate thickness (the thickness of the original plate) is 0.1 mm to 0.5 mm.

＜Lubricant application procedure＞ The manufacturing method of the bottomed cylindrical body of this embodiment may include a lubricant coating step of coating the lubricant on the surface of the metal plate. As we all know, by applying lubricant, even if strict drawing and shrinking processing is performed in the subsequent drawing step or shrinking step, the metal plate can be processed into a bottomed cylindrical body without damage or breakage. The required shape. Furthermore, in this embodiment, the lubricant coating step is not an essential step, and can be omitted as appropriate.

As the type of lubricant in this embodiment, it is preferable to use a water-soluble lubricant and/or a lubricant with a boiling point of less than 300°C. As the water-soluble lubricant in this embodiment, it is defined as a lubricant soluble in water. By using a water-soluble lubricant, it is possible to remove the lubricant components adhered to the can after making the can without using chemicals (acids, alkalis, surfactants, etc.), so it is preferred. Furthermore, in this embodiment, for example, when washing with water in the following washing step, it is preferable to remove the lubricant component or the refrigerant component so that unevenness and shrinkage of the paint do not occur in the printing of the subsequent step. To the extent of defects such as holes.

Furthermore, in this embodiment, the so-called "water-soluble lubricant and/or lubricant with a boiling point less than 300°C" means that it may include a "water-soluble lubricant" and a "lubricant with a boiling point less than 300°C" Any one of them may also include both of them. Furthermore, it also means that a lubricant with either "water-soluble" and "boiling point below 300°C" can be used, and it can also be used with both "water-soluble" and "boiling point below 300°C". Two types of lubricants.

In addition, in this embodiment, a lubricant having a boiling point of less than 300°C is preferred, because the lubricant component can be vaporized and removed at a relatively low temperature after the can-making step. Furthermore, from the viewpoint of equipment cost, energy cost, etc., the boiling point of the lubricant is more preferably less than 250°C. As the lubricant in this embodiment, specifically, a disposable oil that is commercially available as a volatile lubricant can be applied. Furthermore, with regard to the coating amount and coating method of the lubricant, a known amount and a known method can be applied.

＜Drawing step＞ Next, the drawing step in this embodiment will be described. In the drawing step in the present embodiment, the processed surface of the formed member (for example, a drawing die or a drawing punch) in the drawing step is preferably a predetermined hardness or more. Specifically, the Vickers hardness Hv of the hardness of the above-mentioned processed surface must exceed 1500-12000. In addition, in the case where a lubricant coating step is provided before the above-mentioned drawing step, the lower limit of the hardness of the processed surface of the formed member in the drawing step can be set to Hv1500. The reason is as follows.

That is, when the embodiment of FIG. 1 deep step of pulling metal plate is provided here, between at drawing die D _D and the drawing punch P _D be interposed with a state where the metal plate 10 of, by drawing the punch P _D The deep drawing process is performed to manufacture a shallow drawn cup M. At this time, since it would have a better impact load to the drawing and the die D _D drawing punch P _D, and therefore must be able to withstand higher with the mass production of live degree of durability and abrasion resistance.

In addition, in this embodiment, in order to reduce the environmental load or cost in the cleaning step, the lubricant applied in the lubricant coating step as described above is preferably a water-soluble lubricant and/or a boiling point. Lubricant up to 300°C. At this time, in order to avoid damage or breakage of the metal plate due to the formed member, it is necessary to impart higher hardness or slidability to the mold.

Based on the above point of view, the inventors of the present invention conducted repeated tests and found that, in this embodiment, when the hardness of the processed surface of the formed member is set to exceed 1500 to 12000 in Vickers hardness Hv, even though the implementation is severe There are no problems with deep drawing, durability or wear resistance, and damage to metal plates.

In this embodiment, as the forming processing member (mold) in the drawing step, as long as the processed surface has the above-mentioned hardness, it can be manufactured using a base material composed of a known material, or it may be processed on the above-mentioned base material. A surface-treated film L (refer to FIG. 1) is formed on the surface.

Regarding the above-mentioned mold, as the material of the base material, specifically, it can include: a cemented carbide obtained by sintering a mixture of tungsten carbide (WC) and a metal binder such as cobalt; for metal carbides such as titanium carbide (TiC) Or cermets obtained by sintering a mixture of titanium compounds such as titanium carbonitride (TiNC) and metal binders such as nickel or cobalt; ceramics, etc.

In addition, as the surface treatment film L formed on the substrate, for example, a carbon film, a ceramic film, etc. can be preferably used.

As said carbon film, a diamond film, a DLC film, etc. are mentioned. The method for forming the carbon film is not particularly limited, and for example, a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method can be applied.

In addition, as the ceramic film, for example, silicon carbide (SiC) or silicon nitride (Si ₃ N ₄ ), aluminum oxide (Al ₂ O ₃ ), zirconium oxide (ZrO ₂ ), titanium nitride (TiN), Hard ceramics such as titanium carbide (TiC) and chromium nitride (CrN).

In this embodiment, as a combination of the types of forming parts used in the drawing step, the same material or surface treatment film can be used for both the drawing die and the drawing punch, or different materials can be used. Or surface treatment film. For example, both the deep-drawing die and the deep-drawing punch may be made of cemented carbide, or one of the deep-drawing die and the deep-drawing punch may be made of cemented carbide. Alternatively, a carbon film may be formed on the processing surface of both the drawing die and the drawing punch, or a carbon film may be formed on the processing surface of either the drawing die or the drawing punch.

Furthermore, when the surface treatment film of one of the drawing die and the drawing punch is a diamond film, it is better from the viewpoint of managing the size between the dies or preventing the damage between the dies The other surface treatment film is a surface treatment film other than the diamond film.

<Drawing steps> Next, the contraction step in this embodiment will be described. As the shrinking step in this embodiment, it is preferable that a carbon film is formed on the processed surface of the forming processing member (for example, shrinking die or shrinking punch) in the shrinking step.

If the drawing is used to more specifically explain the shrinking steps of this embodiment, as shown in Fig. 2(a) and (b), for example, it includes the following steps: Use the shrinking die D _{I with the diamond film 20 formed on the processed surface , And a shrinking punch P I} with a surface treatment film 30 that is different from the diamond film formed on the processed surface _{, using the processed surface of the die D I} and the punch P _I to align the shallow drawing cup with the refrigerant C interposed M performs shrinking processing.

At this time, the shrinking die D _I and the shrinking punch P _I must have high durability or wear resistance to the extent that they can withstand mass production. In addition, in this embodiment, the above-mentioned refrigerant C must be a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300°C. Therefore, in order to avoid damage or breakage of the processed component (metal plate 10 or shallow drawing cup M), it must be formed on either surface of the _{shrinking die D I} and the shrinking punch P _I. There is a carbon film that has both hardness and sliding properties. As the carbon film, a diamond film, a DLC film, or the like can be cited. The method for forming the carbon film is not particularly limited, and for example, a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method can be applied.

Furthermore, in the present embodiment, the term "water-soluble refrigerant and/or refrigerant with a boiling point less than 300°C" means that it may include any of "water-soluble refrigerant" and "refrigerant with a boiling point less than 300°C" It can also include both "water-soluble refrigerant" and "refrigerant with a boiling point below 300°C". Furthermore, it also means that a certain refrigerant can be used with either "water-soluble" or "boiling point less than 300°C", or both "water-soluble" and "boiling point less than 300°C" can be used. The nature of refrigerant.

Furthermore, in this embodiment, especially in the shrinking step, it is preferable to form a diamond film with a Vickers hardness Hv of about 8000 to 12000 on the processing surface of either the male mold or the female mold of the mold.

That is, as shown in FIG. 2, a diamond film 20 with a higher hardness can be formed on _{the processing surface of the shrinking die D I} , and a surface treatment film 30 different from the diamond film _{can be formed on the processing surface of the shrinking punch P I} Surface; vice versa, but not shown in the figure. Furthermore, generally speaking, the shrinking die can bear more severe processing load than the shrinking punch in most cases. Therefore, it is particularly preferable to form the diamond film 20 on the processing surface of the shrinking die.

The thickness of the above-mentioned diamond film 20 is preferably 5 μm to 30 μm. When the thickness is less than 5 μm, the obtained diamond film is prone to cracks and becomes easy to peel off, so it is not good. On the other hand, when the thickness exceeds 30 μm, the internal stress of the diamond film becomes high and it becomes easy to peel off, which is not preferable.

In addition, in this embodiment, from the viewpoint of imparting higher sliding characteristics to the mold, the surface roughness Ra (JIS B-0601-1994) of the diamond film 20 is preferably 0.12 μm or less. Furthermore, when Ra is set to 0.08 μm or less, the appearance of the processed object (for example, a can body) can be made into a mirror surface or a smooth surface close to a mirror surface, which is more preferable. In this case, the friction coefficient μ between the diamond film 20 and the material to be processed during the stamping process is preferably less than 0.1.

Next, the refrigerant used in the contraction step of this embodiment will be described. The refrigerant used in this embodiment may contain oil in its components, and it is preferable that it can be easily washed in the subsequent washing step, or it can be removed by drying even if no washing step is provided. . Therefore, the refrigerant in this embodiment must be a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300°C.

Furthermore, as the above-mentioned water-soluble refrigerant, it is defined as a refrigerant soluble in water. By using a water-soluble refrigerant, it is possible to remove the components of the refrigerant adhering to the tank after making the tank without using chemicals (acids, alkalis, surfactants, etc.), so it is preferable. Furthermore, in this embodiment, for example, when washing with water in the following washing step, it is preferable to remove the lubricant component or the refrigerant component so that unevenness and shrinkage of the paint do not occur in the printing of the subsequent step. To the extent of defects such as holes.

In addition, a refrigerant having a boiling point of less than 300°C is preferable because the adhered refrigerant component can be vaporized and removed at a relatively low temperature after the can-making step. Furthermore, from the viewpoint of equipment cost or energy cost, the boiling point of the refrigerant is more preferably less than 250°C. As the refrigerant in this embodiment, specifically, a disposable oil that is commercially available as a volatile lubricating oil can be applied.

In addition, the refrigerant in this embodiment may contain additives as long as it does not impair the water solubility and/or the boiling point of less than 300°C. For example, it may also contain water, surfactants, rust inhibitors, extreme pressure additives, coupling agents, non-ferrous metal corrosion inhibitors, preservatives, rust inhibitors, defoamers, chelating agents, colorants, perfumes, etc. as appropriate.

In particular, the refrigerant of this embodiment preferably contains an anticorrosive agent and/or a rust preventive agent. The reason is as follows. That is, in the case of a water-soluble refrigerant, it contains a large amount of substances that can become a nutrient source for microorganisms such as bacteria or molds. Therefore, there are the following problems: the diluted refrigerant is easy to decay, and the parts in contact with the refrigerant in the processing equipment are easy to rust.

Furthermore, in the present embodiment, the so-called "preservative and/or rust inhibitor" means that it can include any one of "preservative" and "rust inhibitor", and can also include "preservative" and "preservative". Anti-rust agent" both. Furthermore, it also means that a substance with either "anti-corrosion" and "anti-rust" can be used, and a substance with both "anti-corrosion" and "anti-rust" properties can also be used.

If the refrigerant is corrupted, the lubricating function or cooling function of the refrigerant will decrease. Not only that, but the odor caused by the corruption will also cause problems. In addition, in the case of rust, problems such as a significant decrease in the life of the processing device or damage to the processed object may occur. In addition, there is also a cost problem, which is caused by the occurrence of corruption or rust, which increases the frequency of refrigerant replacement. Furthermore, when mold or rust occurs, it can also become a cause of clogging of pipes in circulation systems such as pumps.

As the antiseptic and rust inhibitor, as long as the refrigerant is water-soluble and/or has a boiling point of less than 300°C, a known substance can be suitably used. For example, formaldehyde-releasing or phenol-based substances, or amine-based substances may be added as appropriate.

In this way, in the manufacturing method of this embodiment, even when a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300° C. is used, molding defects during can manufacturing can be suppressed, and as a result, molding stability can be improved.

Furthermore, in this embodiment, as described above, a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300°C is used. Therefore, in the following cleaning step, it is possible to clean with chemicals or water with a low environmental load. Alternatively, the washing step itself may be omitted, so that the load on the environment can be reduced. In addition, since the treatment of the discharged water after washing becomes easier, when the discharged water is recycled and reused, the recycling rate can be improved, and the cost or the load on the environment can be reduced.

Furthermore, in the shrinking step of this embodiment, it is preferable to include a shrinking processing step, which shrinks the metal material to form a can so that the shrinkage rate (the reduction rate of the plate thickness) becomes 10% or more. The main body. Furthermore, it can include multiple shrinking and shrinking processing steps, and the shrinking and shrinking rate can be changed each time. For example, the contraction rate of the initial contraction step can be set to more than 10%, and the contraction rate of the final contraction step can be set to more than 30%. Furthermore, when the plate thickness before shrinking processing is set to t0, and the plate thickness after processing (the part 60 mm from the bottom of the tank) is set to t1, the shrinking rate in this embodiment is expressed by the following formula . Retraction rate (%)=100×(t0－t1)/t0

＜Washing steps＞ Next, the cleaning step in this embodiment will be described. The washing step in this embodiment is a step as follows: the detergent is brought into contact with the bottomed cylindrical body obtained in the above drawing step and shrinking step, and the inside of the bottomed cylindrical body is removed. Lubricant and/or refrigerant on the surface and outer surface. Furthermore, in this embodiment, the washing step is not an essential step, and can be omitted as appropriate.

As a method of bringing the detergent into contact with the bottomed cylindrical body, a known method can be suitably used. For example, the bottomed cylindrical body can be immersed in the detergent, and the detergent can also be sprayed with a sprayer or a water jet.

As the detergent used in this embodiment, in addition to a known alkaline detergent, acidic detergent, or neutral detergent, water can also be used. Examples of alkaline detergents include aqueous solutions of inorganic compounds such as sodium carbonate, potassium carbonate, sodium bicarbonate, sodium hydroxide, and potassium hydroxide. In addition, as the above-mentioned acidic detergent, for example, aqueous solutions of inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and hydrofluoric acid can be cited. As the neutral detergent, a surfactant or the like can be used. Furthermore, after washing with an alkaline detergent, an acid detergent, or a neutral detergent, in general, in order to remove the detergent remaining on the surface of the metal plate, it is preferable to perform a water washing treatment After that, the moisture on the surface of the metal plate is removed by methods such as blasting or hot air drying.

In addition, the concentration of the cleaning component of the cleaning agent when using an alkaline cleaning agent or an acidic cleaning agent, etc., is preferably 3.0% by volume or less from the viewpoint of cost reduction or environmental impact.

In the cleaning step in this embodiment, it is preferable that the temperature of the cleaning agent used does not reach 70°C. That is, in this embodiment, since the lubricant in the drawing step and the refrigerant in the shrinking step are both water-soluble and/or the boiling point does not reach 300°C, even if the temperature of the detergent does not reach 70°C, It can fully remove the oil on the inner surface and outer surface of the bottomed cylindrical body.

On the other hand, as the lower limit of the temperature of the detergent, room temperature (for example, 20°C) is preferred. Generally speaking, in order to improve the cleaning performance when cleaning processing oil or the like in metal press processing, the cleaning agent is heated and used. However, in order to heat the detergent, corresponding energy resources are consumed. Therefore, in the present embodiment, from the viewpoint of cost reduction or environmental load reduction, when a detergent is used, it can be used at room temperature as long as the detergency does not decrease.

Furthermore, in the present embodiment, the washing time in the washing step is preferably 45 seconds or less from the viewpoint of cost reduction or environmental load reduction. That is, in this embodiment, since the lubricant in the drawing step and the refrigerant in the shrinking step are water-soluble and/or the boiling point is less than 300°C, even if the washing time is 45 seconds or less, it can be Fully clean the inner and outer surfaces of the bottomed cylindrical body. In addition, the lower limit of the washing time is not particularly limited. As a lower limit of the washing time that can be washed practically and normally without any problem with the discharge water treatability, it is preferably more than 10 seconds, for example. In addition, as a cleaning method, when spraying the detergent with a sprayer or a water sprayer, it is preferable that the spray amount of the detergent per tank is 60 to 70 ml/sec.

In the washing step of this embodiment, the lubricant and refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body are removed by a detergent. Therefore, the weight of the bottomed cylindrical body before and after washing changes, and the weight change is preferably less than 100 mg/m ² .

That is, in this embodiment, as described above, the lubricant in the drawing step and the refrigerant in the shrinking step are both water-soluble and/or the boiling point is less than 300°C, so they can be passed through the can-making step (drawing After the step and the shrinking step), the amount of lubricant or refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body is reduced.

Therefore, by reducing the weight change of the bottomed cylindrical body before and after washing to less than 100 mg/m ² , the amount of lubricant and refrigerant contained in the discharged water generated during the washing step can also be reduced, thereby reducing the environment load.

＜Drying step＞ In this embodiment, the reason why the washing step can be appropriately omitted is as described above. In this case, in order to remove the lubricant and refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body, it is preferable to provide a drying step. That is, in the present embodiment, it is preferable to use both water-soluble and/or boiling point less than 300°C lubricant and refrigerant for both the lubricant in the drawing step and the refrigerant in the shrinking step. Therefore, after the can-making step (the drawing step and the shrinking step), the washing step can be omitted and the drying step can be used to remove the lubricant and refrigerant adhering to the inner surface and the outer surface.

In the drying step of this embodiment, specifically, for example, heating is performed in a drying oven at about 150 to 300°C for 30 to 180 seconds, thereby removing the inner surface and outer surface of the bottomed cylindrical body. The lubricants and refrigerants.

＜Purification step＞ Next, the purification step in this embodiment will be described. The purification step is to purify the drain water discharged from the shrinking step and/or the washing step in the manufacturing method of the bottomed cylindrical body described above. Furthermore, in this embodiment, the so-called "discharged water discharged in the shrinking step and/or washing step" means that it can be the "discharged water discharged in the shrinking step" and "the discharged water discharged in the washing step". Either of the "drained water" may be both "drained water from the shrinking step" and "drained water from the washing step".

That is, as described above, the shrinking step in the method of manufacturing a bottomed cylindrical body of the present embodiment is to perform shrinking processing via a refrigerant. In addition, in the washing step, in addition to the formal washing that uses a detergent to remove the lubricant and refrigerant adhering to the surface of the bottomed cylindrical body, pre-washing with water or in the formal washing is also carried out. After cleansing, use water to remove the detergent for rinsing, etc. Therefore, a large amount of discharged water is generated during the washing step.

Therefore, as shown in FIG. 3, the manufacturing method of the bottomed cylindrical body in this embodiment may further include a purification step of purifying the above-mentioned discharged water. At this time, for the following reasons, the discharged water purified as described above is preferably recovered (reused) again as purified water to the shrinking step or the washing step.

That is, in the method of manufacturing a bottomed cylindrical body in this embodiment, as described above, the lubricant applied in the lubricant coating step is water-soluble and/or has a boiling point of less than 300°C. In addition, as for the refrigerant used in the shrinking step, as described above, it is a water-soluble refrigerant and/or a boiling point of less than 300°C. Therefore, the oil content in the discharged water discharged in the shrinking step and the washing step also does not reach the specified value.

Therefore, the discharged water generated in the shrinking step and/or the washing step can be purified by a relatively simple method. In addition, by going through the above-mentioned purification steps, further reduction in environmental load or cost reduction can be achieved.

As a method of purifying the discharged water in the above purification step, a known method can be suitably used. That is, methods such as filtration, neutralization, boiling, precipitation, suspension, biological treatment, UV sterilization, etc. can be appropriately combined for purification. In addition, coagulants, disinfectants, bactericides, etc. can also be appropriately mixed.

In summary, according to the method of manufacturing a bottomed cylindrical body of this embodiment, the following effects can be exerted. (A) Since the processed surface of the forming member in the shrinking step has a carbon film, the refrigerant used in the shrinking step can be made water-soluble and/or the boiling point is less than 300°C. (B) Since the hardness of the processed surface of the formed member in the drawing step is set to a predetermined value or more, the lubricant coating step of applying the lubricant on the surface of the metal plate (flat plate) before the drawing process can be omitted. (C) As a result, the heating of the detergent in the washing step can be suppressed, and/or the washing time can be shortened. In addition, it is not necessary to provide a washing step. (D) In the end, the environmental load can be reduced or the cost can be reduced.

Moreover, in this embodiment, if the above-mentioned purification step is further performed, the following effects can be further exhibited. (E) It is easy to purify the discharged water discharged in the shrinking step and/or washing step. (F) The discharged water can be purified and recycled (reused), which can reduce the cost or the load on the environment.

(Second Embodiment) Next, the manufacturing method of the bottomed cylindrical body of the second embodiment will be described. The schematic diagram showing the drawing step shown in FIG. 1 can also be applied to the second embodiment. In addition, the schematic diagram showing the contraction step shown in FIG. 2 can also be applied to the second embodiment. Furthermore, FIG. 4 is a schematic diagram showing the flow of the manufacturing method of the bottomed cylindrical body of the second embodiment.

＜Metal plate＞ The metal plate as the material to be processed in this embodiment is not particularly limited as long as it is a metal plate used in general metal press processing. For example, aluminum, copper, iron, steel, and titanium can be applied. Furthermore, not only pure metals but also various known metal plates such as alloys thereof can be applied. Among them, in the case of forming a seamless can body, an aluminum alloy plate is particularly suitable.

The thickness of the metal plate in this embodiment is not particularly limited, and the usual thickness when manufacturing seamless cans can be applied. For example, as an example of the thickness of the metal plate when an aluminum alloy plate is used for can-making processing, the original plate thickness (the thickness of the original plate) is 0.1 mm to 0.5 mm.

＜Lubricant application procedure＞ The manufacturing method of the bottomed cylindrical body of this embodiment may also include a lubricant coating step of coating a lubricant on the surface of the metal plate (flat plate) before the drawing process. Furthermore, in this embodiment, the aforementioned lubricant generally also includes an oil called "metalworking oil" or "metal cutting oil". As we all know, by coating well-known processing oil or lubricant before drawing, even if strict drawing and shrinking is performed in the subsequent drawing or shrinking step, the metal plate can be processed without being damaged or broken. Into the required shape such as a bottomed cylindrical body. However, in this embodiment, it is understood that this step is not an essential step for the following reasons.

As the types of lubricants in this embodiment, the following types can be cited. For example, mineral oil composed of fatty acid esters, fatty alcohols, fatty acids, etc. can be used. Alternatively, water-soluble lubricants or lubricants with a boiling point of less than 300°C can also be used. As the water-soluble lubricant in this embodiment, it is defined as a lubricant soluble in water. By using a water-soluble lubricant, it is possible to remove the lubricant components adhered to the can after making the can without using chemicals (acids, alkalis, surfactants, etc.), so it is preferred. Furthermore, in this embodiment, for example, when washing with water in the following washing step, it is preferable to remove the lubricant component or the refrigerant component so that unevenness and shrinkage of the paint do not occur in the printing of the subsequent step. To the extent of defects such as holes.

As a lubricant with a boiling point of less than 300°C, specifically, a disposable oil that is commercially available as a volatile lubricating oil can be used. A lubricant with a boiling point of less than 300° C. is preferable because it can be removed by vaporizing the attached lubricant component at a relatively low temperature after the can-making step. Furthermore, in consideration of equipment cost or energy cost, the boiling point of the lubricant is preferably less than 250°C.

Furthermore, in this step, with regard to the coating amount and coating method of the lubricant, a known amount and a known method can be applied.

In the present embodiment, the viscosity of the above-mentioned lubricant is preferably less than 200 mPa·s from the viewpoint of reducing the environmental load or cost in the cleaning step, which is the purpose of the present invention. When the viscosity of the lubricant is 200 mPa·s or more, it may not be sufficient to clean or remove the lubricant in the subsequent washing step or drying step, so it is not good. Furthermore, the viscosity of the lubricant is preferably less than 100 mPa·s.

＜Drawing step＞ Next, the drawing step in this embodiment will be described. In the drawing step in the present embodiment, the processed surface of the formed member (for example, a drawing die or a drawing punch) in the drawing step is preferably a predetermined hardness or more. Specifically, the Vickers hardness Hv of the hardness of the above-mentioned processed surface must be 1000-12000. Specifically, the method for manufacturing a bottomed cylindrical body in this embodiment is characterized in that the hardness Hv of the processing surface of the drawing die is more than 1500 to 12000, and the hardness Hv of the processing surface of the drawing punch is 1000 to 12000. The reason is as follows.

That is, when the embodiment of FIG. 1 deep step of pulling metal plate is provided here, between at drawing die D _D and the drawing punch P _D be interposed with a state where the metal plate 10 of, by drawing the punch P _D The deep drawing process is performed to manufacture a shallow drawn cup M. At this time, since it would have a better impact load to the drawing and the die D _D drawing punch P _D, and therefore must be able to withstand higher with the mass production of live degree of durability and abrasion resistance.

Furthermore, in this embodiment, in order to reduce the environmental load or cost in the cleaning step, the step of applying processing oil or lubricant on the surface of the metal plate (flat plate) before the drawing process can be omitted. At this time, in order to avoid damage or breakage of the metal plate due to the forming and processing of components, it is necessary to impart higher hardness or slidability to the mold.

Based on the above point of view, the inventors of the present invention carried out repeated tests and found that in this embodiment, when the hardness of the processed surface of the formed member in the deep drawing process is set as the hardness of the processed surface of the deep drawing die using the Vickers hardness meter. When the hardness Hv exceeds 1500～12000, and the hardness Hv of the processing surface of the drawing punch is 1000～12000, despite the implementation of severe drawing processing, shrinking processing, durability or wear resistance, metal plate damage, etc. There is no problem.

Furthermore, in this embodiment, as the forming processing member (mold) in the drawing step, as long as the processed surface has the above-mentioned hardness, it can be manufactured using a base material composed of a known material, or it may be based on the above-mentioned base material. The surface treatment film L (refer to Figure 2) is formed on the processed surface of the material.

Regarding the above-mentioned mold, as the material of the base material, specifically, it can include: a cemented carbide obtained by sintering a mixture of tungsten carbide (WC) and a metal binder such as cobalt; for metal carbides such as titanium carbide (TiC) Or cermets obtained by sintering a mixture of titanium compounds such as titanium carbonitride (TiNC) and metal binders such as nickel or cobalt.

In addition, as the surface treatment film L formed on the substrate, for example, a carbon film, a ceramic film, a fluororesin film, etc. can be preferably used.

As the above-mentioned carbon film, a diamond film having a Vickers hardness Hv of about 8000 to 12000 or a DLC film having a Vickers hardness Hv of about 3000 to 7000 can be cited. The method for forming the carbon film is not particularly limited, and for example, a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method can be applied.

In addition, examples of the ceramic film include hard ceramics such as silicon carbide (SiC), silicon nitride (Si ₃ N ₄ ), aluminum oxide (Al ₂ O ₃ ), and zirconium oxide (ZrO _{2 ).}

In this embodiment, as a combination of the types of forming members used in the drawing step, the same material or surface treatment film L can be used for both the drawing die and the drawing punch, or different Material or surface treatment film L. For example, both the deep-drawing die and the deep-drawing punch may be made of cemented carbide, or one of the deep-drawing die and the deep-drawing punch may be made of cemented carbide. Alternatively, a carbon film may be formed on the processing surface of both the drawing die and the drawing punch, or a carbon film may be formed on the processing surface of either the drawing die or the drawing punch. That is, in FIG. 2, the machined surface deep processing die D _D is to the pull-formed surface treatment film is L, to the drawing processing surface of the punch P _D of not formed surface treatment film is L, but the present invention is not limited thereto.

Furthermore, in this embodiment, it is preferable that a carbon film is formed on the processing surface of at least one of the male mold and the female mold during the deep drawing process. For example, when a drawing die is used as a female die and a drawing punch is used as a male die, it is preferable that a carbon film is formed on the processing surface of at least one of them.

Furthermore, specifically, a DLC film can be formed on the processing surface of both the deep drawing die and the deep drawing punch, and a diamond film can also be formed on the processing surface of one of the deep drawing die and the deep drawing punch. , And a DLC film is formed on the processed surface of the other.

Especially, from the viewpoint of managing the size between the dies or suppressing damage between the dies, when the surface treatment film of one of the drawing die and the drawing punch is a diamond film, the other The surface treatment film of the other is more preferably a surface treatment film other than the diamond film. In this case, it is particularly preferable to form a diamond film on a deep drawing die which is subjected to a higher processing load. Furthermore, the diamond film only needs to be formed on at least the above-mentioned processed surface of the die head, and it may also be formed on other parts.

The thickness of the above-mentioned diamond film is preferably 5 μm to 30 μm. When the thickness is less than 5 μm, the obtained diamond film is prone to cracks and becomes easy to peel off, so it is not good. On the other hand, when the thickness exceeds 30 μm, the internal stress of the diamond film becomes high and it becomes easy to peel off, which is not preferable.

On the other hand, when the surface treatment film of one of the drawing die and the drawing punch is a diamond film, the thickness of the surface treatment film formed on the processed surface of the other is preferably 0.1-10 μm It is particularly preferable to set it to be thinner than the thickness of the diamond film. The reason is as follows. That is, for example, when the thickness of the surface treatment film formed on the drawing punch is made thinner than the thickness of the diamond film formed on the drawing die, since the film is thinner, the size due to the film formation can be reduced. error. In addition, the Vickers hardness of the surface treatment film is soft compared to the diamond film, so it can be easily polished by using well-known diamond abrasive grains, which can reduce the processing cost. Not only that, but also can be processed with high precision. Into the target mold size.

<Drawing steps> Next, the contraction step in this embodiment will be described. As the shrinking step in this embodiment, it is characterized in that the hardness Hv of the processed surface of the forming processing member (for example, shrinking die or shrinking punch) in the shrinking step is 1500 to 12000.

If the drawing is used to more specifically explain the shrinking steps of this embodiment, as shown in Fig. 2(a) and (b), for example, it includes the following steps: Use the shrinking die D _{I with the diamond film 20 formed on the processed surface , And a shrinking punch P I} with a surface treatment film 30 that is different from the diamond film formed on the processed surface _{, using the processed surface of the die D I} and the punch P _I to align the shallow drawing cup with the refrigerant C interposed M performs shrinking processing.

At this time, the shrinking die D _I and the shrinking punch P _I must have high durability or wear resistance to the extent that they can withstand mass production. Furthermore, in this embodiment, as described below, the concentration of the oil contained in the refrigerant C must be less than 4.0% by volume, or the refrigerant C must be a water-soluble refrigerant or a refrigerant with a boiling point of less than 300°C. Therefore, in order to avoid damage or breakage of the processed component (metal plate 10 or shallow drawing cup M), the hardness Hv of the processed surface of the _{shrinking die D I} and the shrinking punch P _{I must be 1500 to 12000} .

Among the above, it is particularly preferable that a carbon film is formed on either of the processing surfaces of the _{shrinking die D I} and the shrinking punch P _I. As the carbon film, for example, a diamond film having a Vickers hardness Hv of about 8000 to 12000, or a DLC film having a Vickers hardness Hv of about 3000 to 7000, etc. can be cited. The method for forming the carbon film is not particularly limited, and for example, a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method can be applied.

Furthermore, in this embodiment, it is particularly preferable to form a diamond film on the processed surface of either the male mold or the female mold of the mold. That is, as shown in FIG. 2, a diamond film 20 with a higher hardness can be formed on _{the processing surface of the shrinking die D I} , and a surface treatment film 30 different from the diamond film _{can be formed on the processing surface of the shrinking punch P I} Surface; vice versa, but not shown in the figure.

Furthermore, generally speaking, the shrinking die can bear more severe processing load than the shrinking punch in most cases. Therefore, it is particularly preferable to form the diamond film 20 on the processing surface of the shrinking die.

The thickness of the above-mentioned diamond film 20 is preferably 5 μm to 30 μm. When the thickness is less than 5 μm, the obtained diamond film is prone to cracks and becomes easy to peel off, so it is not good. On the other hand, when the thickness exceeds 30 μm, the internal stress of the diamond film becomes high and it becomes easy to peel off, which is not preferable.

On the other hand, the thickness of the surface treatment film 30 that is different from the diamond film 20 is preferably about 0.1-10 μm, and it is particularly preferable to set it to be thinner than the thickness of the diamond film 20. The reason is as follows. That is, for example, when the thickness of the surface treatment film 30 is made thinner than the thickness of the diamond film 20, since the film is thinner, the dimensional error caused by the film formation can be reduced originally.

In this embodiment, from the viewpoint of imparting higher sliding characteristics to the mold, the surface roughness Ra (JIS B-0601-1994) of the diamond film 20 is preferably 0.12 μm or less. Furthermore, when Ra is set to 0.08 μm or less, the appearance of the processed object (for example, a can body) can be made into a mirror surface or a smooth surface close to a mirror surface, which is more preferable. In this case, the friction coefficient μ between the diamond film 20 and the material to be processed during the stamping process is preferably less than 0.1.

Next, the refrigerant used in the contraction step of this embodiment will be described. The refrigerant used in this embodiment may contain oil in its components, and it is preferable that it can be easily washed in a subsequent washing step, or it can be removed by drying even if a washing step is not provided. Therefore, the refrigerant in this embodiment preferably satisfies at least any one of the following (a) to (c): (a) the oil content is less than 4.0% by volume; (b) is a water-soluble refrigerant; or ( c) It is a refrigerant with a boiling point below 300°C.

In the case of (a) the refrigerant containing less than 4.0% by volume, as the oil, the oil contained in the general water-soluble metalworking oil composition can be cited. The oil can be natural oil or synthetic oil.

Examples of natural oils include mineral oils such as paraffin-based, naphthenic-based, and aromatic-based oils. In addition, fatty acid glycerides can also be cited as natural oils. Examples of synthetic oils include hydrocarbons such as polyolefins, esters such as fatty acid esters, ethers such as polyalkylene glycols, fluorine-containing systems such as perfluorocarbons, phosphorus-containing systems such as phosphate esters, and silicates. And other silicon-containing systems. As the oils listed above, they may be used singly, or two or more of them may be mixed and used.

Specifically, for example, A1 type (emulsion type) or A2 type (soluble type) water-soluble metal processing oils specified in JIS K 2241 can be cited. In addition, water-soluble metalworking oils that are called synthetic types (that is, metalworking oils that do not contain mineral oil but contain chemically synthesized oils) although not specified in the JIS standard can also be cited.

In this embodiment, the concentration of the above-mentioned oil in the refrigerant is preferably less than 4.0% by volume. In this case, the refrigerant can be prepared by the following method: first, prepare a stock solution containing an oil content of 4.0% by volume or more, store the stock solution before use, and dilute the stock solution with a solvent such as water during use to prepare Refrigerant whose oil concentration is less than 4.0% by volume. That is, the concentration of the oil in the refrigerant only needs to be less than 4.0% by volume in the use state.

Next, regarding the refrigerant used in this embodiment, (b) water-soluble refrigerant is defined as a refrigerant soluble in water. By using a water-soluble refrigerant, it is possible to remove the components of the refrigerant adhering to the tank after making the tank without using chemicals (acids, alkalis, surfactants, etc.), so it is preferable. Furthermore, in this embodiment, for example, when washing with water in the following washing step, it is preferable to remove the lubricant component or the refrigerant component so that unevenness and shrinkage of the paint do not occur in the printing of the subsequent step. To the extent of defects such as holes.

In addition, in this embodiment, as (c) a refrigerant with a boiling point of less than 300°C, specifically, a disposable oil that is commercially available as a volatile lubricating oil can be applied. A refrigerant with a boiling point of less than 300° C. is preferable because it can be removed by vaporizing the attached refrigerant component at a relatively low temperature after the can-making step. Furthermore, from the viewpoint of equipment cost, energy cost, etc., the boiling point of the refrigerant is more preferably less than 250°C.

Furthermore, as the refrigerant of this embodiment, the refrigerants of (a), (b), and (c) described above can be mixed and used. In addition, refrigerants with multiple properties in (a), (b), and (c) can also be used.

In addition, in the refrigerant in this embodiment, as long as it does not impair the characteristics of at least any one of (a) the oil content does not reach 4.0% by volume, (b) water solubility, or (c) the boiling point does not reach 300°C, It can also contain additives. For example, water, surfactants, rust inhibitors, extreme pressure additives, coupling agents, non-ferrous metal corrosion inhibitors, preservatives, rust inhibitors, defoamers, chelating agents, coloring materials, perfumes, etc. may also be appropriately contained.

In particular, the refrigerant of this embodiment preferably contains an anticorrosive agent and/or a rust preventive agent. The reason is as follows. That is, in the case of a water-soluble refrigerant, it contains a large amount of substances that can become a nutrient source for microorganisms such as bacteria or molds. Therefore, there are the following problems: the diluted refrigerant is easy to decay, and the parts in contact with the refrigerant in the processing equipment are easy to rust. Furthermore, in the present embodiment, the so-called "preservative and/or rust inhibitor" means that it can include any one of "preservative" and "rust inhibitor", and can also include "preservative" and "preservative". Anti-rust agent" both. Furthermore, it also means that a substance with either "anti-corrosion" and "anti-rust" can be used, and a substance with both "anti-corrosion" and "anti-rust" properties can also be used.

If the refrigerant is corrupted, the lubricating function or cooling function of the refrigerant will decrease. Not only that, but the odor caused by the corruption will also cause problems. In addition, in the case of rust, problems such as damage to the processed object may occur. In addition, there is also a cost problem, which is caused by the occurrence of corruption or rust, which increases the frequency of refrigerant replacement. Furthermore, when mold or rust occurs, it can also become a cause of clogging of pipes in circulation systems such as pumps.

As an antiseptic and/or rust inhibitor, as long as it does not damage the characteristics of at least any one of (a) the oil content of less than 4.0% by volume, (b) water solubility, or (c) the boiling point of less than 300℃ , You can use well-known substances appropriately. For example, formaldehyde-releasing or phenol-based substances, or amine-based substances may be added as appropriate.

As mentioned above, in the manufacturing method of this embodiment, the refrigerant used during shrinkage processing is (a) the oil content is less than 4.0% by volume, (b) the water-soluble refrigerant, or (c) the boiling point is less than 300 When at least any one of the refrigerants at a temperature of ℃, it can suppress forming defects during can making, and as a result can improve the forming stability.

In addition, in this embodiment, since the refrigerant as described above is used, it is possible to clean with chemicals or water with a low environmental load in the following cleaning step. Alternatively, the washing step itself can be omitted, so that the load on the environment can be reduced. In addition, since the treatment of the discharged water after washing becomes easier, when the discharged water is recycled and reused, the recycling rate can be improved, and the cost or the load on the environment can be reduced.

Furthermore, in the shrinking step of this embodiment, it is preferable to include a shrinking processing step, which shrinks the metal material to form a can so that the shrinkage rate (the reduction rate of the plate thickness) becomes 10% or more. The main body. Furthermore, it can include multiple shrinking and shrinking processing steps, and the shrinking and shrinking rate can be changed each time. For example, the contraction rate of the initial contraction step can be set to more than 10%, and the contraction rate of the final contraction step can be set to more than 30%. Furthermore, when the plate thickness before shrinking processing is set to t0, and the plate thickness after processing (the part 60 mm from the bottom of the tank) is set to t1, the shrinking rate in this embodiment is expressed by the following formula . Retraction rate (%)=100×(t0－t1)/t0

＜Washing steps＞ Next, the cleaning step in this embodiment will be described. The washing step in this embodiment is a step as follows: the detergent is brought into contact with the bottomed cylindrical body obtained in the above drawing step and shrinking step, and the inside of the bottomed cylindrical body is removed. Lubricant and refrigerant on the surface and outer surface. Furthermore, in this embodiment, the washing step is not an essential step, and can be omitted as appropriate.

As a method of bringing the detergent into contact with the bottomed cylindrical body, a known method can be suitably used. For example, the bottomed cylindrical body can be immersed in the detergent, and the detergent can also be sprayed with a sprayer or a water jet.

As the detergent used in this embodiment, known alkaline detergents, acid detergents, and neutral detergents can be used, and water can also be used.

Examples of alkaline detergents include aqueous solutions of inorganic compounds such as sodium carbonate, potassium carbonate, sodium bicarbonate, sodium hydroxide, and potassium hydroxide. In addition, as the above-mentioned acidic detergent, for example, aqueous solutions of inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and hydrofluoric acid can be cited.

Furthermore, after washing with an alkaline detergent or an acid detergent, generally speaking, in order to remove the detergent remaining on the surface of the metal plate, it is preferable to perform the water washing treatment by blowing air or Hot air drying and other methods to remove moisture on the surface of the metal plate.

Furthermore, as the concentration of the cleaning component of the cleaning agent when an alkaline cleaning agent or an acidic cleaning agent is used, from the viewpoint of maintaining cleaning performance and suppressing cost or environmental load, it is preferably 2.0 to 5.0 weight%.

In the cleaning step in this embodiment, the temperature of the cleaning agent used is preferably less than 70°C. That is, in this embodiment, it is possible to omit the step of applying processing oil or lubricant on the surface of the metal plate (flat plate) before the drawing process, and use (a) the oil content of less than 4.0% by volume, (b) At least any one of water-soluble refrigerant or (c) refrigerant with a boiling point of less than 300°C is used as the refrigerant in the shrinking step. Therefore, even if the temperature of the detergent does not reach 70°C, the oil on the inner and outer surfaces of the bottomed cylindrical body can be sufficiently removed.

On the other hand, as the lower limit of the temperature of the detergent, room temperature (for example, 20°C) is preferred. Generally speaking, in order to improve the cleaning performance when cleaning processing oil or the like in metal press processing, the cleaning agent is heated and used. However, in order to heat the detergent, corresponding energy resources are consumed. Therefore, in the present embodiment, from the viewpoint of cost reduction or environmental load reduction, when a detergent is used, it can be used at room temperature as long as the detergency does not decrease.

Furthermore, in the present embodiment, the washing time in the washing step is preferably 45 seconds or less from the viewpoint of cost reduction or environmental load reduction. That is, in this embodiment, the lubricant in the drawing step and the refrigerant in the shrinking step are both water-soluble and/or have a boiling point of less than 300°C. Therefore, even if the washing time is 45 seconds or less, it can be The inner and outer surfaces of the bottomed cylindrical body are sufficiently cleaned. In addition, the lower limit of the washing time is not particularly limited. As a lower limit of the washing time that can be washed practically and normally without any problem with the discharge water treatability, it is preferably more than 10 seconds, for example. In addition, as a cleaning method, when spraying the detergent with a sprayer or a water sprayer, the spray amount of the detergent per tank is preferably 60-70 ml/sec.

In the washing step of this embodiment, the lubricant and refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body are removed by a detergent. Therefore, the weight of the bottomed cylindrical body before and after washing changes, and the weight change is preferably less than 100 mg/m ² .

That is, in this embodiment, the amount of lubricant or refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body can be reduced after the can-making step (the drawing step and the shrinking step).

Therefore, by reducing the weight change of the bottomed cylindrical body before and after washing to less than 100 mg/m ² , the amount of lubricant and refrigerant contained in the discharged water generated during the washing step can also be reduced, thereby reducing the environment load.

＜Drying step＞ In this embodiment, the reason why the washing step can be appropriately omitted is as described above. In this case, in order to remove the lubricant and refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body, it is preferable to provide a drying step.

That is, in this embodiment, it is possible to omit the step of applying processing oil or lubricant on the surface of the metal plate (flat plate) before the drawing process, and use (a) the oil content of less than 4.0% by volume, (b) At least any one of water-soluble refrigerant or (c) refrigerant with a boiling point of less than 300°C is used as the refrigerant in the shrinking step. Among them, when the processing oil or lubricant is not applied to the surface of the metal plate (flat plate) before the drawing process, and (c) a refrigerant with a boiling point of less than 300°C is used as the refrigerant in the shrinking step, even in the case of After the tank step (drawing step and shrinking step), no washing step is provided, and the lubricant and refrigerant adhering to the inner and outer surfaces of the bottomed cylindrical body can also be removed by the drying step.

In the drying step of this embodiment, specifically, for example, heating is performed in a drying oven at about 150 to 300°C for 30 to 180 seconds, thereby removing the inner surface and outer surface of the bottomed cylindrical body. The lubricants and refrigerants.

＜Purification step＞ Next, the purification step in this embodiment will be described. The manufacturing method of the bottomed cylindrical body in this embodiment is shown in FIG. 3, and may include a purification step, which purifies the discharged water discharged in the above-mentioned shrinking step and/or washing step.

That is, as described above, regarding the manufacturing method of the bottomed cylindrical body of this embodiment, the shrinking process is performed through the refrigerant in the shrinking step. In addition, in the washing step, a detergent is used to remove the refrigerant component adhering to the surface of the bottomed cylindrical body. Therefore, a large amount of discharged water will be generated in the above two steps.

Therefore, as shown in FIG. 3, the manufacturing method of the bottomed cylindrical body in this embodiment may further include a purification step of purifying the above-mentioned discharged water. At this time, for the following reasons, the discharged water purified as described above is preferably recovered (reused) again as purified water to the shrinking step or the washing step.

Regarding the manufacturing method of the bottomed cylindrical body in this embodiment, as described above, the step of applying processing oil or lubricant to the surface of the metal plate (flat plate) before the drawing process can be omitted. Also, as the refrigerant in the shrinking step, as described above, use at least any of (a) oil content less than 4.0% by volume, (b) water-soluble refrigerant, or (c) refrigerant with a boiling point less than 300°C By.

Therefore, the discharged water generated in the shrinking step and/or the washing step can be purified by a relatively simple method. In addition, by going through the above-mentioned purification steps, further reduction in environmental load or cost reduction can be achieved.

As a method of purifying the discharged water in the above purification step, a known method can be suitably used. That is, methods such as filtration, neutralization, boiling, precipitation, suspension, biological treatment, UV sterilization, etc. can be appropriately combined for purification. In addition, coagulants, disinfectants, bactericides, etc. can also be appropriately mixed.

In summary, according to the method of manufacturing a bottomed cylindrical body of this embodiment, the following effects can be exerted. (A) Since the hardness of the processed surface of the formed member in the drawing step is set to a predetermined value or more, the step of coating the surface of the metal plate (flat plate) with lubricant before the drawing can be omitted. (B) Since the hardness of the processed surface of the forming and processed component in the shrinking step is set to a specified value or more, it is possible to use (a) the oil content is less than 4.0% by volume, (b) water-soluble refrigerant, or (c) At least any one of the refrigerants whose boiling point is less than 300°C is used as the refrigerant in the shrinking step. (C) As a result, the concentration of the cleaning component in the cleaning agent in the cleaning step can be reduced, the heating of the cleaning agent can be suppressed, and/or the cleaning time can be shortened. In addition, the washing step may be omitted. (D) In the end, the environmental load can be reduced or the cost can be reduced.

Moreover, in this embodiment, if the above-mentioned purification step is further performed, the following effects can be further exhibited. (E) It is easy to purify the discharged water discharged in the shrinking step and/or washing step. (F) The discharged water can be purified and recycled (reused), which can reduce the cost or the load on the environment. [Example]

Hereinafter, the present invention will be further explained in detail using examples, but the present invention is not limited to the following examples.

(Example 1) A drawing and shrinking tank (DI tank) with an inner volume of 350 mL was manufactured by the method shown below. First, prepare an aluminum alloy plate (JIS H 4000 3104 material, 0.28 mm). Then, the water-soluble lubricant is used as a lubricant during deep drawing, and the coating is applied on both sides of the aluminum alloy plate at 1.0-1.3 ^{g/m 2.}

Then, the aluminum alloy plate was punched into a disc shape with a diameter of 160 mm using a deep drawing machine, and then immediately drawn into a cup with a diameter of 90 mm. Furthermore, the processed surface hardness of the formed part during the drawing process is set to Hv1500.

The obtained cup is transported to the Bodymaker (can manufacturing machine), and then it is drawn into a shape with a diameter of 66 mm, and then introduced into a shape with a diameter of 66 mm and a height of 130 mm using a refrigerant. Shrink processing.

As the shrinking die at this time, a diamond film with an average thickness of about 10 μm formed on the surface is used. The surface hardness of the diamond film is set to Hv10000. In addition, as the retracting punch used, a diamond-like carbon film with a thickness of 0.5 μm formed on the surface was used. The surface hardness of the diamond-like carbon film is set to Hv3000.

The shrinkage rate during shrinkage processing is shown in Table 1. Water-soluble refrigerant is used in shrinkage processing. Well-known surfactants, rust inhibitors, extreme pressure additives, and preservatives are added to the refrigerant.

The obtained DI tank was washed in order to remove the lubricant and refrigerant components adhering to the inner surface and the outer surface. Sulfuric acid (concentration: 3.0% by volume) is used as a detergent used in washing. In addition, the temperature of the detergent during washing was set to 20°C, and the washing time was set to 30 seconds.

(Example 2) Except for using the lubricant having the boiling point shown in Table 1 as the lubricant at the time of drawing, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Example 3) As shown in Table 1, the processing surface hardness of the formed member at the time of drawing processing was changed, and except for that, it was carried out in the same manner as in Example 1. The results are shown in Table 1.

(Example 4) Except changing the processing surface hardness of the drawing die at the time of drawing processing as shown in Table 1, it carried out similarly to Example 1 except this. The results are shown in Table 1.

(Example 5) Except changing the processing surface hardness of the drawing punch at the time of drawing processing as shown in Table 1, it carried out similarly to Example 1 except this. The results are shown in Table 1.

(Example 6) As the shrinking die for shrinking processing, use a drilled carbon film with an average thickness of 0.5 μm formed on the surface. The surface hardness of the diamond-like carbon film is set to Hv3000. Except for the above, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Example 7) As the shrinking punch used for shrinking processing, a diamond film with an average thickness of about 10 μm formed on the surface is used. The surface hardness of the diamond film is set to Hv10000. Except for the above, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Example 8) Regarding the refrigerant used in the shrinking process, the one with the boiling point shown in Table 1 is used. Except for the above, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Example 9) As the cleaning agent used for cleaning, pure water was used, except for this, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Example 10) Except for drying (at 300° C. for 30 seconds) instead of the washing step after drawing and shrinking, it was carried out in the same manner as in Example 1. The results are shown in Table 1.

(Example 11) As the refrigerant used in the shrinking process, the one with the boiling point shown in Table 1 is used. Except for the above, the same procedure as in Example 2 was carried out. The results are shown in Table 1.

(Example 12) As the cleaning agent used for cleaning, pure water was used, and except for this, the same procedure as in Example 2 was carried out. The results are shown in Table 1.

(Example 13) Except for drying (at 300° C. for 30 seconds) instead of the washing step after the drawing and shrinking process, the operation was performed in the same manner as in Example 2. The results are shown in Table 1.

(Example 14) As the cleaning agent used for cleaning, pure water was used, except for this, the same procedure as in Example 8 was carried out. The results are shown in Table 1.

(Example 15) Except for the drying (at 300° C. for 30 seconds) instead of the washing step after the drawing and shrinking process, it was carried out in the same manner as in Example 8. The results are shown in Table 1.

(Example 16) As the cleaning agent used for cleaning, pure water was used, except for this, the same procedure as in Example 11 was carried out. The results are shown in Table 1.

(Example 17) Except that drying (at 300° C. for 30 seconds) was carried out in place of the washing step after the drawing and shrinking process, it was carried out in the same manner as in Example 11. The results are shown in Table 1.

(Example 18) After the washing step after drawing and shrinking, it is dried (at 300°C for 30 seconds). Except for the above, the same procedure as in Example 14 was carried out. The results are shown in Table 1.

(Example 19) After the washing step after drawing and shrinking, it is dried (at 300°C for 30 seconds). Except for the above, the same procedure as in Example 12 was carried out. The results are shown in Table 1.

(Example 20) The lubricant was not applied during the drawing process, and the shrinkage ratio during the shrinking process was set to the value shown in Table 1, except that it was carried out in the same manner as in Example 3. The results are shown in Table 1.

(Comparative example 1) Except for coating a water-insoluble lubricant as a lubricant at the time of drawing, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Comparative example 2) Except for using the lubricant having the boiling point shown in Table 1 as the lubricant at the time of drawing, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Comparative example 3) Except changing the processing surface hardness of the drawing die at the time of drawing processing as shown in Table 1, it carried out similarly to Example 1, but the main body fracture|rupture occurred in a drawing process. The results are shown in Table 1.

(Comparative Example 4) Regarding the shrinking die and shrinking punch during shrinking processing, those made of cemented carbide (Hv1000) are used. Except for the above, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Comparative Example 5) Except for using a water-insoluble refrigerant as the refrigerant used in the shrinking process, the same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Comparative Example 6) Regarding the refrigerant used in the shrinking process, use the one with the boiling point shown in Table 1, and dry it (at 300°C for 30 seconds) instead of the washing step after the drawing and shrinking process. Otherwise, all The same procedure as in Example 1 was carried out. The results are shown in Table 1.

(Comparative Example 7) A water-insoluble refrigerant is used as the refrigerant used in the shrinking process, and drying (at 300°C for 30 seconds) is used instead of the washing step after the drawing and shrinking process. Except for this, the same as in Example 1 conduct. The results are shown in Table 1.

(Comparative Example 8) Except that no lubricant was applied during the drawing process, it was carried out in the same manner as in Example 1, but the main body was broken in the drawing process. The results are shown in Table 1.

[Evaluation] The DI tank obtained by the above method was evaluated by the following method. The results are shown in Table 1.

[Retractability] Visually observe the following 3 items: (i) whether there is any breakage during the shrinking process; (ii) whether the opening of the obtained DI can is penetrated (black stripes) or whether the internal and external surfaces of the can body are discolored; and (iii) the can Whether the outer surface of the main body is damaged. The excellent ones with no problems in the above 3 items are rated as ◎, those with problems in any of the items but able to withstand practical use are rated as ○, and those with problems in any of the items and unable to withstand practical use are rated as ×.

[Printing adaptability] The obtained DI tank was washed, and the water-based paint was applied to the surface of the washed tank, and then burned by a known method to evaluate the unevenness of the paint. Those who did not visually observe the unevenness of the paint were rated as ○, and those who had unevenness due to shrinkage of the paint were rated as ×. Furthermore, when uneven paint occurs, it can be judged that the lubricant and/or refrigerant used in the drawing step or shrinking step remains.

[Discharge water treatment property] After spraying the DI tank with the above-mentioned washing liquid and washing with water, the generated discharge water is contained in a beaker, and the chemical oxygen demand (COD) is measured by a known method. If the COD is less than 200 ppm, it is judged as ○ (better treatability of the discharged water), and if the COD is more than 200 ppm, it is judged as × (the treatability of discharged water is poor). The results are shown in Table 1.

[Table 1] Lubricant coating steps Drawing step Retraction step Washing steps Drying step Evaluation Water-soluble or water-insoluble Boiling point Die surface hardness Punch surface hardness Die surface type Punch surface type Retraction rate (%) Type of refrigerant Refrigerant boiling point Detergent ingredients Drying temperature Retractability Printing adaptability Discharge water treatment Example 1 Water soluble - 1500 1500 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Example 2 - 299 1500 1500 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Example 3 Water soluble - 10000 10000 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Example 4 Water soluble - 12000 1500 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Example 5 Water soluble - 1500 12000 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Example 6 Water soluble - 1500 1500 DLC film DLC film 40 Water soluble - sulfuric acid - ○ ○ X Example 7 Water soluble - 1500 1500 Diamond film Diamond film 40 Water soluble - sulfuric acid - ◎ ○ X Example 8 Water soluble - 1500 1500 Diamond film DLC film 40 - 299 sulfuric acid - ◎ ○ X Example 9 Water soluble - 1500 1500 Diamond film DLC film 40 Water soluble - water - ◎ ○ ○ Example 10 Water soluble - 1500 1500 Diamond film DLC film 40 Water soluble - - 30 seconds at 300°C ◎ X - Example 11 - 299 1500 1500 Diamond film DLC film 40 - 299 sulfuric acid - ◎ ○ X Example 12 - 299 1500 1500 Diamond film DLC film 40 Water soluble - water - ◎ X ○ Example 13 - 299 1500 1500 Diamond film DLC film 40 Water soluble - - 30 seconds at 300°C ◎ X - Example 14 Water soluble - 1500 1500 Diamond film DLC film 40 - 299 water - ◎ X ○ Example 15 Water soluble - 1500 1500 Diamond film DLC film 40 - 299 - 30 seconds at 300°C ◎ X - Example 16 - 299 1500 1500 Diamond film DLC film 40 - 299 water - ◎ X ○ Example 17 - 299 1500 1500 Diamond film DLC film 40 - 299 - 30 seconds at 300°C ◎ ○ - Example 18 Water soluble - 1500 1500 Diamond film DLC film 40 - 299 water 30 seconds at 300°C ◎ ○ ○ Example 19 - 299 1500 1500 Diamond film DLC film 40 Water soluble - water 30 seconds at 300°C ◎ ○ ○ Example 20 - - 10000 10000 Diamond film DLC film 41 Water soluble - sulfuric acid - ◎ ○ X Comparative example 1 Water insoluble - 1500 1500 Diamond film DLC film 40 Water soluble - sulfuric acid - ◎ ○ X Comparative example 2 - 350 1500 1500 Diamond film DLC film 40 Water soluble - water - ◎ X ○ Comparative example 3 Water soluble - 1000 1500 Unable to form during the drawing step (main body breakage occurs) X - - Comparative example 4 Water soluble - 1500 1500 Cemented carbide Cemented carbide 40 Water soluble - sulfuric acid - X ○ X Comparative example 5 Water soluble - 1500 1500 Diamond film DLC film 40 Water insoluble - water - ◎ X ○ Comparative example 6 Water soluble - 1500 1500 Diamond film DLC film 40 - 350 - 30 seconds at 300°C ◎ X - Comparative example 7 Water soluble - 1500 1500 Diamond film DLC film 40 Water insoluble - - 30 seconds at 300°C ◎ X - Comparative example 8 - - 1500 1500 Unable to form during the drawing step (main body breakage occurs) X - -

(Example 21) Use the method shown below to manufacture a deep drawing tank (DI tank) with an inner volume of 350 mL. First, prepare an aluminum alloy plate (JIS H 4000 3104 material, 0.28 mm). Lubricant was not applied to both sides of the above-mentioned aluminum alloy plate.

Then, the aluminum alloy plate was punched into a disc shape with a diameter of 160 mm using a deep drawing machine, and then immediately drawn into a cup with a diameter of 90 mm. Furthermore, as shown in Table 2, set the machined surface hardness of the formed part during the drawing process.

The obtained cup is transported to the Bodymaker (can manufacturing machine), and then it is drawn into a shape with a diameter of 66 mm, and then introduced into a shape with a diameter of 66 mm and a height of 130 mm using a refrigerant. Shrink processing.

As the shrinking die at this time, a diamond film with an average thickness of about 10 μm formed on the surface is used. Set the surface hardness of the diamond film as shown in Table 2. In addition, as the retracting punch used, a diamond-like carbon film with a thickness of 0.5 μm formed on the surface was used. Set the surface hardness of the diamond-like carbon film as shown in Table 2.

Set the shrinkage rate during shrinking processing as shown in Table 2. Set the oil content in the refrigerant as shown in Table 2. Well-known surfactants, rust inhibitors, extreme pressure additives, and preservatives are added to the refrigerant.

The obtained DI tank was washed in order to remove the lubricant and refrigerant components adhering to the inner surface and the outer surface. Sulfuric acid (concentration: 3.0%) is used as a detergent used in washing. In addition, the temperature of the detergent during washing was set to 50°C, and the washing time was set to 30 seconds.

(Example 22) The processing surface hardness of the shrinking die at the time of shrinking processing was changed as shown in Table 2, and it carried out similarly to Example 21 except for this. The results are shown in Table 2.

(Example 23) The processing surface hardness of the shrinking die at the time of shrinking processing was changed as shown in Table 2, and it carried out similarly to Example 21 except for this. The results are shown in Table 2.

(Example 24) The processing surface hardness of the shrinking punch at the time of shrinking processing was changed as shown in Table 2, and it carried out similarly to Example 21 except for this. The results are shown in Table 2.

(Example 25) Change the oil content of the refrigerant used in the shrinking process as shown in Table 2. Except for the above, the same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Example 26) As the refrigerant used in the shrinking process, the one with the boiling point shown in Table 2 is used. Except for the above, the same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Example 27) As the cleaning agent used in the cleaning, pure water was used. Except for this, the same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Example 28) As the refrigerant used in the shrinking process, use the one with the boiling point shown in Table 2 and dry it (at 300°C for 30 seconds) instead of the washing step after the drawing process. The same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Example 29) As shown in Table 2, the processing surface hardness of the punch and the die in the drawing processing step and the shrinking processing step were changed in the same manner as in Example 27, except for this. The results are shown in Table 2.

(Example 30) As shown in Table 2, the processing surface hardness of the punch and the die in the drawing processing step and the shrinking processing step were changed in the same manner as in Example 27, except for this. The results are shown in Table 2.

(Example 31) As shown in Table 2, the processing surface hardness of the punch and the die in the drawing process and the shrinking process were changed in the same manner as in Example 28, except for this. The results are shown in Table 2.

(Example 32) As shown in Table 2, the processing surface hardness of the punch and the die in the drawing process and the shrinking process were changed in the same manner as in Example 21 except for this. The results are shown in Table 2.

(Example 33) Before the drawing step, water-soluble lubricating oil was applied, and the processing surface hardness of the drawing punch and the drawing die in the drawing step was changed as shown in Table 2. Except for this, the same procedures as in Example 27 were carried out. . The results are shown in Table 2.

(Example 34) Except changing the processing surface hardness of the drawing punch in the drawing step as shown in Table 2, the same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Example 35) Except for coating water-soluble lubricating oil before the drawing process, it carried out similarly to Example 34. The results are shown in Table 2.

(Example 36) Except changing the processing surface hardness of the punch in the drawing processing step and the shrinking processing step as shown in Table 2, the same procedure as in Example 21 was carried out, except for this. The results are shown in Table 2.

(Example 37) Except changing the processing surface hardness of the punch in the shrinking processing step as shown in Table 2, it was performed in the same manner as in Example 34 except for this. The results are shown in Table 2.

(Comparative Example 9) Except changing the processing surface hardness of the drawing die at the time of drawing processing as shown in Table 2, it carried out similarly to Example 21, but the main body fracture|rupture occurred in the drawing process. The results are shown in Table 2.

(Comparative Example 10) Except for changing the processing surface hardness of the drawing die and the drawing punch at the time of drawing as shown in Table 2, it was performed in the same manner as in Example 21, but the main body was broken in the drawing step. The results are shown in Table 2.

(Comparative Example 11) As shown in Table 2, the processing surface hardness of the shrinking die and the shrinking punch were changed in the same manner as in Example 21, except that the processing surface hardness was changed. The results are shown in Table 2.

(Comparative Example 12) Except that the water-soluble lubricating oil was applied before the drawing step, it was carried out in the same manner as in Comparative Example 11. The results are shown in Table 2.

(Comparative Example 13) Except for drying (at 300° C. for 30 seconds) instead of the washing step after drawing and shrinking, it was carried out in the same manner as in Example 21. The results are shown in Table 2.

(Comparative Example 14) Change the processing surface hardness of the punch and die in the drawing and shrinking processing steps as shown in Table 2, and change the oil content of the refrigerant used in the shrinking processing as shown in Table 2. Except for the above, the same procedure as in Example 27 was carried out. The results are shown in Table 2.

(Comparative Example 15) Change the oil content of the refrigerant used in the shrinking process as shown in Table 2. Except for the above, the same procedure as in Example 21 was carried out. The results are shown in Table 2.

(Comparative Example 16) Except for coating water-soluble lubricating oil before the drawing process step, it carried out similarly to the comparative example 13. The results are shown in Table 2.

[Evaluation] The DI tank obtained by the above method was evaluated by the following method. The results are shown in Table 2.

[Retractability] Visually observe the following 3 items: (i) whether there is breakage during the shrinking process; (ii) whether the opening of the obtained DI can is penetrated (black stripes); and (iii) whether the outer surface of the can body is damaged. Those who have no problems in the above 3 items and the surface of the tank are mirrored are rated as ◎, those who have no problems in all items are rated as ○, those who have problems in any of the items but can withstand practical use are rated as △, and Those who have problems with any item and cannot withstand practical use are rated as ×.

[Printing adaptability] After washing the obtained DI tank, a water-based paint was applied to the surface of the washed tank, and then burned by a known method to evaluate the unevenness of the paint. Those who did not visually observe the unevenness of the paint were rated as ○, and those who had unevenness due to shrinkage of the paint were rated as ×. Furthermore, when uneven paint occurs, it can be judged that the lubricant and/or refrigerant used in the drawing step or shrinking step remains.

[Discharge water treatment property] After spraying the DI tank with the above-mentioned washing liquid and washing with water, the generated discharge water is contained in a beaker, and the chemical oxygen demand (COD) is measured by a known method. If the COD is less than 200 ppm, it is judged as ○ (better treatability of the discharged water), and if the COD is more than 200 ppm, it is judged as × (the treatability of discharged water is poor). The results are shown in Table 2.

[Table 2] Lubricant coating steps Drawing step Retraction step Washing steps Drying step Evaluation Die surface hardness Punch surface hardness Die surface hardness Punch surface hardness Type of refrigerant Retraction rate (%) Detergent ingredients Drying temperature Retractability Printing adaptability Discharge water treatment Example 21 none 12000 1500 12000 8000 Water soluble 40 sulfuric acid - ◎ ○ X Example 22 none 12000 1500 2000 8000 Water soluble 40 sulfuric acid - △ ○ X Example 23 none 12000 1500 5000 8000 Water soluble 40 sulfuric acid - ○ ○ X Example 24 none 12000 1500 12000 2000 Water soluble 40 sulfuric acid - ◎ ○ X Example 25 none 12000 1500 12000 8000 Oil content 3.9% by volume 40 sulfuric acid - ◎ ○ X Example 26 none 12000 1500 12000 8000 Boiling point 299℃ 40 sulfuric acid - ◎ ○ X Example 27 none 12000 1500 12000 8000 Water soluble 40 water - ◎ ○ ○ Example 28 none 12000 1500 12000 8000 Boiling point 299℃ 40 - 30 seconds at 300°C ◎ ○ ○ Example 29 none 10000 10000 10000 8000 Water soluble 40 water - ◎ ○ ○ Example 30 none 5000 5000 10000 8000 Water soluble 40 water - ◎ ○ ○ Example 31 none 5000 5000 10000 8000 Boiling point 299℃ 40 - 30 seconds at 300°C ◎ ○ ○ Example 32 none 12000 1500 2000 12000 Water soluble 40 sulfuric acid - △ ○ X Example 33 Yes (water-soluble) 1500 1500 12000 8000 Water soluble 40 water - ◎ ○ ○ Example 34 none 12000 1000 12000 8000 Water soluble 40 sulfuric acid - ◎ ○ X Example 35 Yes (water-soluble) 12000 1000 12000 8000 Water soluble 40 sulfuric acid - ◎ ○ X Example 36 none 12000 1000 12000 1500 Water soluble 40 sulfuric acid - △ ○ X Example 37 Yes (water-soluble) 12000 1000 12000 1500 Water soluble 40 sulfuric acid - ◎ ○ X Comparative example 9 none 1500 1500 - - - - - - - - - Comparative example 10 none 1500 12000 - - - - - - - - - Comparative example 11 none 12000 1500 1500 1500 Water soluble 40 sulfuric acid - X ○ X Comparative example 12 Yes (water-soluble) 12000 1500 1500 1500 Water soluble 40 sulfuric acid - X ○ X Comparative example 13 none 12000 1500 12000 8000 Water soluble 40 - 30 seconds at 300°C ◎ X ○ Comparative example 14 none 12000 1500 10000 8000 Oil content 3.9% by volume 40 water - ◎ X ○ Comparative example 15 none 12000 1500 12000 8000 Oil content 5.0% by volume 40 sulfuric acid - ◎ ○ X Comparative example 16 Yes (water-soluble) 12000 1500 12000 8000 Oil content 5.0% by volume 40 sulfuric acid - ◎ ○ X

According to the method of manufacturing a bottomed cylindrical body of the first embodiment, even when the refrigerant used in the shrinking step is made water-soluble and/or the boiling point is less than 300°C, it can be obtained with the same Or higher shrinkage rate of bottomed cylindrical body. In addition, according to the first embodiment, a lubricant coating step of applying a lubricant to the surface of a metal plate (flat plate) before deep drawing can be further provided, even if the lubricant is made water-soluble and/or has a boiling point lower than When the temperature reaches 300°C, the same or higher processability can be obtained as before.

In the first embodiment, water-soluble lubricants or refrigerants, and lubricants or refrigerants with a boiling point of less than 300°C are used in the drawing step and the shrinking step. Therefore, in the washing step, it is not necessary to use a detergent. Use water or hot water for washing. Alternatively, the cleaning step may not be provided, and the lubricant, refrigerant, etc. adhering to the can body may be removed by drying after the can making process. Also, it is obvious that it can be recycled (reused) again to the shrinking step or the washing step through a purification step of purifying the discharged water generated in the shrinking step and the washing step.

According to the method of manufacturing a bottomed cylindrical body of the second embodiment, even if the refrigerant used in the shrinking step meets (a) the concentration of the oil contained is less than 4.0% by volume, (b) the water-soluble refrigerant, or ( c) When the boiling point does not reach at least any one of 300°C, a bottomed cylindrical body with the same or higher shrinkage rate can also be obtained.

In the second embodiment, the above-mentioned refrigerant is used. Therefore, in the washing step, water or hot water can be used for washing without using a detergent. Alternatively, the cleaning step may not be provided, and the lubricant, refrigerant, etc. adhering to the can body may be removed by drying after the can making process. Also, it is obvious that it can be recycled (reused) again to the shrinking step or the washing step through a purification step of purifying the discharged water generated in the shrinking step and the washing step. [Industrial availability]

The present invention is suitable for the field of metal stamping processing which maintains workability or forming stability and is environmentally friendly.

D _D : Deep drawing die P _D : Deep drawing punch D _I : Shrinking die P _I : Shrinking punch C: Refrigerant M: Shallow deep drawing cup L: Surface treatment film 10: Metal plate 20: Diamond film 30: Surface treatment film

[Fig. 1] is a schematic diagram showing the drawing step in the manufacturing method of the bottomed cylindrical body in one embodiment of the present invention. [Fig. 2] is a schematic diagram showing the shrinking step in the manufacturing method of the bottomed cylindrical body in one embodiment of the present invention. [Fig. 3] is a schematic diagram showing the flow of a method of manufacturing a bottomed cylindrical body in an embodiment of the present invention. [Fig. 4] is a schematic diagram showing the flow of a method for manufacturing a bottomed cylindrical body in another embodiment of the present invention.

D _D : deep drawing die

P _D : Deep drawing punch

M: shallow draw cup

L: Surface treatment film

10: Metal plate

Claims (14)

A method for manufacturing a bottomed cylindrical body, which includes: In the drawing step, the metal plate is drawn using a formed member with a surface hardness Hv of more than 1500-12000; and In the shrinking step, a shaped processed member with a carbon film on the processed surface is used to ironing the processed member through a refrigerant to form a bottomed cylindrical body; and The above-mentioned refrigerant is a water-soluble refrigerant and/or a refrigerant with a boiling point of less than 300°C. Such as the method of manufacturing a bottomed cylindrical body of claim 1, wherein the bottomed cylindrical body is a seamless tank. The method for manufacturing a bottomed cylindrical body of claim 1 or 2, wherein the metal plate is aluminum alloy. The method for manufacturing a bottomed cylindrical body according to any one of claims 1 to 3, wherein the carbon film is a diamond film. The method for manufacturing a bottomed cylindrical body according to any one of claims 1 to 4, which includes a lubricant coating step, The lubricant coating step is to apply a water-soluble lubricant and/or a lubricant with a boiling point of less than 300°C on the metal plate before the drawing step of deep drawing processing on the metal plate, and The hardness Hv of the processed surface of the formed member in the above-mentioned drawing step is 1500 to 12000. The method for manufacturing a bottomed cylindrical body according to any one of claims 1 to 5, wherein the above-mentioned refrigerant has an anticorrosive agent and/or a rust preventive agent. The method for manufacturing a bottomed cylindrical body according to any one of claims 1 to 6, further comprising a washing step of removing lubricant and/or refrigerant adhering to the surface of the bottomed cylindrical body. The method for manufacturing a bottomed cylindrical body according to any one of claims 1 to 7, which further includes a purification step that purifies the discharged water discharged in the above-mentioned shrinking step and/or washing step. A method for manufacturing a bottomed cylindrical body, which includes: In the drawing step, the metal plate is drawn using a drawing die with a surface hardness Hv of more than 1500-12000 and a drawing punch with a Hv of 1000-12000; and In the shrinking step, the processed member with the hardness Hv of the processed surface of 1500 ~ 12000 is used, and the processed member is processed through the refrigerant to make a bottomed cylindrical body; and The above-mentioned refrigerant satisfies at least any one of the following (a) to (c): (a) the concentration of the oil contained does not reach 4.0% by volume; (b) the water-soluble refrigerant; or (c) the boiling point does not reach 300°C. Such as Claim 9 of the method for manufacturing a bottomed cylindrical body, wherein the bottomed cylindrical body is a seamless tank. The method for manufacturing a bottomed cylindrical body of claim 9 or 10, wherein the metal plate is aluminum alloy. The method for manufacturing a bottomed cylindrical body according to any one of claims 9 to 11, wherein the processing surface of the forming member in the above-mentioned drawing step and/or the processing of the forming member in the above-mentioned shrinking step A carbon film is formed on the surface. Such as the method for manufacturing a bottomed cylindrical body according to any one of claims 9 to 12, which includes a lubricant coating step, The lubricant coating step is to coat the lubricant on the surface of the metal plate before the drawing step; and The hardness Hv of the processed surface of the drawing die in the above drawing step is 1000-12000. For example, the method for manufacturing a bottomed cylindrical body according to any one of claims 9 to 13, which further includes a purification step for the exhaust discharged in the above-mentioned shrinking step or the washing step after the above-mentioned shrinking step The water is purified.

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