JPH09239437A - Material for manufacturing hollow member and method for manufacturing hollow member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blank for production of hollow member in which the shape or dimension of a hollow member having a hollow part can be set freely and to provide the production method for the hollow member. SOLUTION: This blank is provided with a plastically deformable metal body 1 having a hollow part 2, formed inside, and a deformable and removable part 4 filled in the hollow part 2. The removable part 4 is formed of a low melting point material whose melting point is lower than a metal constituting the metal body 1, a material soluble in a solvent which does not dissolve the metal composing the metal body 1, a material mainly composed of a granular body and a fluidized powder, etc. The hollow member can be produced by removing the removable part 4 after plastically machining this blank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow member manufacturing material and a hollow member manufacturing method for forming a hollow member having a hollow portion which serves as a flow path for flowing a fluid.

[0002]

2. Description of the Related Art For example, in a heat exchanger used for an air conditioner, a freezer, a refrigerator, etc., a hollow member having a flow path formed inside a metal body has been conventionally used. As this kind of hollow member, a hollow member obtained by a method of fixing a metal pipe to the surface of a metal plate by welding or the like, or after forming a release agent layer on the joint surface of two metal plates, There is known one obtained by a method of forming a hollow channel by expanding a hollow channel by bonding metal plates together and blowing a high-pressure fluid along the joint surface.

[0003]

By the way, in each of the above-mentioned hollow member manufacturing methods, although there is an advantage that the shape of the flow path can be set relatively freely, the hollow member itself after forming the flow path may be bent. It was difficult to do so because the flow path might be crushed or narrowed locally. It was also difficult to adjust the dimensions of the entire member, especially the thickness, over a wide range.

The present invention has been made in view of the above circumstances, and provides a material for manufacturing a hollow member and a hollow member manufacturing method capable of freely setting the shape and dimensions of a hollow member having a hollow portion. Is an issue.

[0005]

In order to solve the above-mentioned problems, a material for producing a hollow member according to the present invention is filled with a plastically deformable metal body having a hollow portion formed therein. And a deformable removable portion. The removable portion can be formed of the following materials. A low melting point material having a lower melting point than the metal forming the metal body. A material that can be dissolved by a solvent that does not dissolve the metal forming the metal body. A material mainly composed of powder and granules. Fluids such as liquids, viscous fluids and slurries.

Another material for manufacturing a hollow member according to the present invention is a plastically deformable metal body having a hollow portion formed inside, a peeling layer formed on the inner surface of the hollow portion, and the peeling layer. And a deformable removable portion filled inside. The release layer can be formed of the following materials. A low melting point material having a lower melting point than the metal forming the metal body. A material that can be dissolved by a solvent that does not dissolve the metal forming the metal body. A material mainly composed of powder and granules.

The first method for manufacturing a hollow member according to the present invention includes a step of forming a hollow portion inside a metal body and a step of forming a removable portion that can be removed in a later step inside the hollow portion. And a step of plastically deforming the metal body in which the removable portion is provided, and a step of removing the removable portion from the plastically deformed metal body.

Further, the second method for manufacturing a hollow member according to the present invention comprises a step of forming a hollow portion inside the metal body, and a step of forming a release layer which can be removed in a later step on the inner surface of the hollow portion. A step of forming a removable portion that can be removed in a later step inside the peeling layer, a step of plastically deforming the metal body on which the peeling layer and the removable portion are formed, and the metal that has been plastically deformed A step of removing the peeling layer and the removable portion from the body. In any of the first and second methods, the metal body may be expanded by injecting a high-pressure fluid into the hollow portion after the removable portion is removed. Further, as the removable portion, a material containing a substance that generates a gas when heated is used, and the metal body is heated after the step of plastically deforming the metal body on which the removable portion is formed. A gas may be generated from the removable portion to thereby expand the metal body.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a hollow member manufacturing material and a hollow member manufacturing method according to the present invention will be described in detail below. [First Embodiment] FIG. 1 shows a first embodiment of a hollow member forming material according to the present invention. This hollow portion forming material includes a plastically deformable metal body 1 having a hollow portion 2 formed therein and a deformable removable portion 4 filled in the hollow portion 2. The metal body 1 of this example has a rectangular parallelepiped shape, while the hollow portion 2 is a through hole having a circular cross section which penetrates the metal body 1 in the longitudinal direction. However, the shapes of the metal body 1 and the hollow portion 2 are not limited to these shapes as described later.

The material of the metal body 1 is not particularly limited in the present invention as long as it is a plastically deformable metal. But,
If the hollow member is used as a heat transfer member for cooling or heating any object, the material of the metal body 1 is a metal having excellent thermal conductivity and electrical conductivity,
For example, copper, various copper alloys, aluminum and various aluminum alloys are suitable.

The removable portion 4 is formed of one or more composite materials selected from the following groups. A low melting point material having a lower melting point than the metal forming the metal body 1. A material that can be dissolved by a solvent that does not dissolve the metal forming the metal body 1. A material mainly composed of powder and granules. Fluids such as liquids, viscous fluids and slurries. If the metal body 1 is formed of the above-mentioned various materials, it is possible to easily remove the removable portion 4 from the inside of the hollow portion 2 after performing the necessary plastic working on the metal body 1. Hereinafter, a specific example will be described for each group.

Low-melting-point material In the present specification, the low-melting-point material broadly means not only a material in which a crystal is strictly in a liquid phase but also a solid material which is liquefied at a relatively low temperature or softened to be discharged. It shall be. Therefore, it broadly includes an amorphous material that does not have a strict melting point but is softened by heating and a material that is liquefied or softened by a chemical reaction caused by heating. In particular, a material that is liquefied or softened at a temperature (° C.) not higher than about 1/3 of the melting point (° C.) of the metal material forming the metal body 1 is preferable. Considering the ease of removal work, 100 ° C
Materials that melt or soften below are more preferable. This is because the cost required for removing the removable portion 4 is further reduced if it can be removed at a temperature of about boiling water.

Examples of the low melting point material include low melting point metals (including alloys), thermoplastics, heat decomposable plastics, polymer materials, low melting point inorganic substances, low melting point organic substances, and softening or liquefying at high temperatures. Mixtures of two or more substances are possible. A more specific description for each category is as follows.

The low melting point metal is Sn, Sn alloy, solder, Pb, Pb alloy, Bi, Bi alloy, In, In alloy, Ga, Ga alloy, Zn, Zn alloy, Ag, Ag alloy, Tl, Tl alloy. , Sb, Sb alloys, and the like, or a mixture of two or more thereof. As a particularly preferable low melting point metal, Sn, Sn (43.0%)-
Bi (57.0%), Sn (15.5%)-Bi (5
2.5%)-Pb (32.0%), Sn (12.0%)
-Bi (49.0%)-Pb (18.0%)-In (2
1.0%) and the like.

As the thermoplastics, polyethylene, polypropylene, poly-4-methylpentene-
1, ionomer, polyvinyl chloride, polyvinylidene chloride, ABS resin, polystyrene, AS resin, methacrylic resin, polyvinyl alcohol, cellulosic plastics, thermoplastic elastomers, thermoplastic polyester resins and the like. It is also possible to mix known additives in order to improve the physical properties.

Examples of the thermally decomposable plastics include materials that decompose at relatively low temperatures such as polyethylene, vinyl chloride resin and triacetyl cellulose. As low-melting point polymeric materials and low-melting point organic substances, various fluorine compounds such as fluorinated silicones, silicones, alkylnaphthalenes, polyalkylphthalates, polyphenyl ethers, polyolefins, paraffin hydrocarbons, fats, waxes, etc. are solid at room temperature. The following substances can be exemplified. The low melting point material may be not only a solid but also a powder or granular material, a clay-like material obtained by adding a liquid to powder, or a mixture of two or more kinds.

Materials that can be dissolved by a solvent that does not dissolve the metal that constitutes the metal body. Examples of such soluble materials include salts and polymer compounds that are soluble in polar solvents such as water and alcohol, as well as benzene and ether. Examples thereof include organic compounds such as polymers that are soluble in a nonpolar solvent such as carbon tetrachloride. Further, as the solvent, an acid or alkali solution that does not dissolve the metal body 1 can be used. The dissolvable material may be a solid, may be in a highly viscous state, or may be a state in which a powder is kneaded in a clay state with a liquid as required or is pressed and solidified.

Material Mainly Consisting of Granules The removable portion 4 is formed of a granule, a clay-like material in which a granule and a liquid are mixed, or a material obtained by compressing and solidifying these. In such a case, since the removable portion 4 can be removed by washing or crushing in a subsequent process, it is not always necessary to heat and melt or dissolve with a solvent. Therefore, in addition to the materials listed above, this type of granular material includes oxides, borides, carbides, nitrides, silicides, sulfides, carbonates such as barium carbonate, and phosphates such as calcium phosphate. One or a mixture of two or more selected from sulfates such as calcium sulfate, strontium sulfate and lead sulfate can be used. In the case of forming a clay-like material as required, these powders and granules may be mixed with a liquid such as water.

Fluids such as liquids, viscous fluids, slurries, etc. Such fluids include water, water glass, organic solvents such as alcohol and glycerin, perfluoropolyether,
Perfluoroolefin, fluorinated silicone, other fluorine compounds, silicone oil, silicone grease,
Examples thereof include oils such as mineral oil, alkylnaphthalene, polyalkylphthalate, polyphenyl ether, petroleum wax, microcrystalline wax, paraffin wax, and a mixture of one or more substances selected from polyolefin wax. In addition, in the fluid as described above,
It is also possible to use a substance in which some substance is dissolved or an insoluble powder as shown in (1) is dispersed to form a slurry.

When a fluid is used as the removable portion 4, if the both ends of the hollow portion 2 are left open as shown in FIG. 2, the removable portion 4 becomes a metal body when the metal body 1 is plastically processed. 1
Since it will leak out from it, it is necessary to block both ends. For that purpose, as shown in FIG. 4, one end of the hollow part 2 can be made a dead end while the other end can be closed by the end plugs 6, and both ends of the hollow part 2 can be closed by the end plugs 6. You can close it. In these cases, both ends of the metal body 1 may be cut off after the plastic working to remove the removable portion 4.

To fix the end plug 6, a female screw is formed on the inner surface of the hollow portion 2, and a male screw to be screwed into the female screw is attached to the end plug 6.
The end plug 6 may be press-fitted, fixed, welded, or adhered to the end of the hollow portion 2. If the end plug 6 is to be machined by rolling or the like, the end plug 6 is also a metal body 1.
It is preferable to be formed of a material having a workability equivalent to

Next, an embodiment of the hollow member manufacturing method according to the present invention via the hollow member manufacturing material of the above embodiment will be described. In this manufacturing method, first, the metal body 1 having the hollow portion 2 is created. For that purpose, the following method can be adopted.

A. When the metal body 1 is cast, a core is placed inside the casting mold, and after the metal body 1 is cast, the core is removed to form the hollow portion 2. As the core, it is possible to use a well-known core such as graphite, ceramics, or heat-resistant metal that does not react with the metal body 1. In addition, as the core at this time, it is also possible to use the above-mentioned dissolvable material or the material mainly composed of the above-mentioned powder or granular material. In this case, the raw material for producing the hollow member can be obtained as it is without removing the core after casting. When casting is performed using a core, the cross-sectional shape of the hollow portion 2 and thus the removable portion 4 can be changed arbitrarily by changing the shape of the core, and a spiral groove or an inner surface of the hollow portion 2 can be formed. It is also possible to form straight grooves. Further, the outer peripheral surface of the core may be processed to have irregularities.

B. The hollow portion 2 is formed in the metal body 1 obtained by a known method by machining or the like. As a method of processing the hollow portion 2, drilling or the like can be efficiently performed, but other processing methods may be adopted. A spiral groove, a linear groove, various irregularities, etc. may be formed on the inner wall surface of the hollow portion 2 after perforation.

C. A plurality of members are joined together to form the hollow portion 2 between them. For example, as shown in FIG. 9, even if a groove 2 is formed in one member 1B and the other member 1A is joined to the groove 2 to form a metal body 1 having a hollow portion 2. Good. In this case, the hollow portion 2 may be filled with the removable portion 4 before joining the members 1A and 1B, or may be filled after joining. Since the groove 2 can be formed into a free plane shape and a cross-sectional shape by cutting, etching, electric discharge, or the like with an end mill, there is an advantage that the shape of the finally obtained hollow portion can be freely set.

In order to fill the removable portion 4 in the hollow portion 2, the material of the removable portion 4 can be made to flow by a method such as heating melting, pulverization, or slurry formation, if necessary, and then the hollow portion 2 Can be filled in. Then, if necessary, the liquid may be removed to solidify it, or it may be cooled to promote solidification. Alternatively, after the removable portion 4 is filled in the hollow portion 2 of the metal body 1, the hollow portion 2 may be closed by the end plug 6 or the like as described above.

After the hollow member manufacturing material is obtained by the above steps, the plastic material is subjected to necessary plastic working to form the metal body 1 into the shape of the hollow member. As the plastic working method, any plastic working method such as extrusion, rolling, rolling, drawing, and bending can be adopted, and a plurality of them may be combined appropriately. The plastic working can be performed either cold or hot, but cold working is preferable from the viewpoint of shape accuracy and the like. If necessary, surface cutting may be performed before or after the plastic working, or an annealing step may be provided during the plastic working.

For example, when the material for manufacturing the hollow member shown in FIG. 1 is thinned by rolling, as the length and thickness of the metal body 1 increase, as shown in FIG.
And the removable portion 4 also narrows in the thickness direction. However, since the removable portion 4 exists, the hollow portion 2 is not completely closed, and the compressibility of the hollow portion 2 is almost the same as the other portions of the metal body 1, and the hollow portion after rolling is The inner diameter of 2 is almost constant over the entire length. The length of the metal body 1 after plastic working is not limited, and may be several meters, or if possible, a long strip material of several tens of meters or more.

After the plastic working is completed, the removable portion 4 is removed from the metal body 1 by using a method suitable for the material of the removable portion 4. For example, if the removable portion 4 is a fluid, the hollow portion 2 may be released and discharged. If the removable portion 4 is formed of a low melting point material, the metal body 1 is removed from the melting point. Also, the removable portion 4 liquefied or softened may be uniformly heated to a high temperature and discharged by gravity. When the discharge force is insufficient due to gravity, pressurized gas or the like is supplied from one end of the hollow portion 2 and / or the other end is connected to a pressure reducing means to discharge the liquefied or softened removable portion 4. May be. When the removable portion 4 is filled with a powder, a slurry, or a clay-like substance, the removable portion 4 may be dissolved by immersing the whole metal body 1 in a solvent such as water or hot water, or the end surface of the hollow portion 2. A jet water stream may be injected from the opening to wash away.

An example of the hollow member 10 thus obtained is shown in FIG. At the center of the hollow member 10, a hollow portion 12 having an elongated elliptical cross section is formed over the entire length.
On the inner wall surface of the hollow portion 12, an inner surface layer 14 made of a material forming the removable portion 4 or an alloy or a reaction product of the material and the material forming the metal body 1 is formed in some cases. If there is an adverse effect, the inner surface layer 14 may be removed by dissolution with various solvents, acid or alkaline solutions, machining, etc., but it may be effective in improving the performance of the hollow member 10. For example, if the inner surface layer 14 is formed of plastic or the like, a corrosion resistant metal or a corrosion resistant alloy, the inner surface of the hollow portion 12 is prevented from being corroded, or the metal is eluted from the metal body 1 into the liquid flowing in the hollow portion 12. It is also possible to prevent

Specific examples of such a preferable inner surface layer 14 include, for example, intermetallic compounds of Sn, Sn and various metals (eg, copper), Zn, intermetallic compounds containing Zn, Ti.
Examples thereof include an intermetallic compound containing, an intermetallic compound containing a noble metal such as gold and silver, barium sulfate, aluminum oxide, an anticorrosive material such as a rust preventive paint, Pb and the like.

According to the hollow member manufacturing material and the hollow member manufacturing method having the above-described structure, the metal body 1 can be plastically worked in the state where the removable portion 4 is filled in the hollow portion 2 of the metal body 1. Therefore, at that time, the hollow portion 2 is not closed. Then, since the removable portion 4 can be removed after the plastic working, the hollow member 1 having a free shape and dimensions.
It is possible to obtain 0, and it can be adapted to any application.

For example, according to the present invention, it is possible to manufacture a very thin hollow member 10 which is difficult to manufacture by other methods. For example, it is also possible to uniformly roll the thickness of the hollow member 10 to about 0.6 mm and manufacture the hollow portion 12 having an inner diameter of only 0.3 to 0.4 mm in the thickness direction inside the hollow member 10. It is possible. In such a case, the hollow member 10
Can also be used as a circuit board material or a lead frame material for semiconductor elements.

Further, the hollow member 10 according to the present invention can be used, for example, as a bus bar used as a high-current-carrying member while being forcedly cooled while circulating a refrigerant in the hollow portion 12, or as a refrigerant or heat in the hollow portion 12. A heat transfer body of a heat exchanger that cools or heats by circulating a medium, and further, a liquid such as water is sealed in the hollow portion 12 under reduced pressure to transfer heat from one end to the other end. The use as a main body of a heat pump can also be illustrated. The bus bar is used as, for example, a connection between a high frequency power source and a heater, a connection between a melting furnace power source and a furnace, a power source plate of the high frequency power source, etc. in a large high frequency furnace. In this type of bus bar, heat transfer member, or the like, it is preferable that a long object is appropriately bent to obtain a required three-dimensional shape. However, according to the present invention, as long as the removable portion 4 is not removed, it is hollow. Since the metal body 1 can be molded into any shape without causing the blockage of the portion 12, there is an advantage that a free shape can be realized. However, the application of the present invention is not limited to these.

[Second Embodiment] In the above-described hollow member manufacturing material and hollow member manufacturing method, the removable portion 4 itself is made of a low melting point material or a metal body having a lower melting point than the metal of the metal body 1. Materials that can be dissolved by a solvent that does not dissolve metals, materials that are mainly composed of powder,
Although it was formed of a fluid or the like, in the present invention, instead, a peeling layer consisting of a single layer or a plurality of layers is formed between the inner wall surface of the hollow portion 2 and the removable portion 4, The removable portion 4 may be pulled out from the hollow portion 2 with the peeling layer as a boundary. That is, the release layer is formed of the above materials.

Any material can be used for the removable portion 4 as long as it is deformable and can be pulled out. For example, copper, copper alloy,
Examples of metals include iron and iron alloys. In particular, when the removable portion 4 is made of the same material as the metal body 1, the plastic deformation rate of the removable portion 4 and the plastic deformation rate of the metal body 1 become equal, and the shape setting of the finally obtained hollow portion 12 is easy. Has the advantage of becoming. However, the material of the removable portion 4 is not limited to metal, and may be formed of, for example, the materials described above.

When the release layer is formed of the above-mentioned materials and the specific examples of these materials and materials may be as described in the first embodiment. However, when the release layer is formed of the material, the removable portion 4 is used. From the viewpoint of facilitating the withdrawal of the powder, a powder having a lubricating action is particularly preferable. For example, graphite, aluminum oxide, barium sulfate,
_{WS 2, MoS 2, CaF 2} , BaF 2, to a solid lubricant such as LiF or singly or may be used in admixture with some additives.

Next, the hollow member manufacturing method according to the second embodiment will be described. In this method, first, the hollow portion 2 is formed in the metal body 1 by the same means as in the first embodiment.

Next, the hollow portion 2 formed in the metal body 1
The peeling layer and the removable portion 4 are formed therein. For that purpose, for example, the following method is possible. i. The materials (1) to (4) are made flowable by a method such as heat melting, pulverization, or slurry formation, and then applied to the inner wall surface of the hollow portion 2 so as to have a constant thickness, and solidified if necessary to remove. Form the layers. At the time of application, some kind of adhesive may be used. Then, the removable portion 4 is formed inside the peeling layer by the same method as in the first embodiment.

Ii. The above materials (1) to (4) are made fluid by a method such as heat melting, pulverization, or slurry formation, and then applied to the outer peripheral surface of the removable portion 4 formed in a rod shape in advance so as to have a constant thickness. After solidifying, the removable portion 4 is inserted into the hollow portion 2. iii. The materials (1) to (4) are formed into a tubular shape, and the tubular body is inserted into the hollow portion 2. And inside the release layer,
The removable portion 4 is formed by the same method as in the first embodiment. iv. The removable portion 4 is positioned and arranged in the hollow portion 2, and the materials (1) to (3) are filled in the hollow portion 2 after being made flowable by a method such as heat melting, pulverization, or slurry formation.

After the hollow member manufacturing material is obtained by the above steps, the hollow member manufacturing material is subjected to necessary plastic working to form the metal body 1 into a desired hollow member shape. As the plastic working method, any plastic working method such as extrusion, rolling, rolling, drawing, and bending can be adopted, and a plurality of them may be combined appropriately. However, since it is finally necessary to pull out the removable portion 4, it is better to keep the shape of the removable portion 4 straight. With a slight degree of curvature, it can be pulled out. Regarding the cross-sectional shape of the removable portion 4, any shape is possible as long as it is the same in the longitudinal direction.

When the plastic working is completed, the peeling layer is heated, melted, softened, or melted and removed as needed, and then the removable portion 4 is pulled out from the metal body 1. The end portion of the removable portion 4 may be made to project from the end portion of the metal body 1 in advance so that it can be easily pulled out. Furthermore, the removable part 4
A hole, a hook portion, a screw, or other engaging portion for engaging the extraction tool or the jig may be formed in the protruding end portion of the.

According to the hollow member manufacturing material and the hollow member manufacturing method according to the second embodiment as described above, by selecting a material that does not easily react with the metal body 1 as the release agent,
Since the material of the removable portion 4 is not limited, the removable portion 4
Can be easily formed from a material having the same plastic deformation characteristics as the metal body 1 (for example, the same material). In that case, since the deformation rate of the removable portion 4 becomes the same as the deformation rate of the metal body 1, it is easy to predict the shape of the removable portion 4 after plastic working,
This has an advantage that the shape of the finally obtained hollow portion 12 can be easily set.

[Third Embodiment] As shown in FIG. 5, a plurality of hollow portions 2 and removable portions 4 (and peeling layers) may be provided in one metal body 1. By rolling this hollow member manufacturing material to remove the removable portion 4, a hollow member 10 as shown in FIG. 6 is obtained. In this case, the plurality of hollow portions 12 may be connected in parallel or may be used in series. The inner surface layer 14 is formed as needed. Other configurations are similar to those of the first or second embodiment.

[Fourth Embodiment] As shown in FIG. 7, the hollow portion 2 and the removable portion 4 (and the peeling layer) may have a rectangular cross section. By rolling this hollow member manufacturing material and removing the removable portion 4, a hollow member 10 as shown in FIG. 8 is obtained. The inner surface layer 14 is formed as needed. Other configurations are similar to those of the first or second embodiment.

[Fifth Embodiment] As shown in FIG. 9, a groove 2 is formed in one member 1B, and the other member 1A is joined on the groove 2 to form a metal having a hollow portion 2. The body 1 may be formed. When this hollow member manufacturing material is rolled to remove the removable portion 4, the hollow member 10 as shown in FIG.
Is obtained. The inner surface layer 14 is formed as needed. Other configurations are similar to those of the first or second embodiment.

[Sixth Embodiment] As shown in FIG. 10, a spiral groove, a linear groove, or various irregularities may be formed on the inner wall surface of the hollow portion 2. By rolling this material for manufacturing a hollow member and removing the removable portion 4, a hollow member 10 with an inner surface groove or unevenness as shown in FIG. 11 is obtained. In this way, the groove and the unevenness formed on the inner surface of the hollow portion 12 function as a wick structure for increasing the capillary force. By increasing the capillary force, it is possible to promote the spread of the heat medium liquid flowing in the hollow portion 12 and improve the heat exchange efficiency. Inner layer 1
4 is formed as needed. Other configurations may be similar to those of the first or second embodiment.

[Seventh Embodiment] As shown in FIG. 12, a hollow portion 2 and a removable portion 4 having a U-shape or a W-shape are formed inside a metal body 1, and the same end of the metal body 1 is formed. You may make it possible to form the inlet and outlet of a flow path in a part. For example, when used as a lead frame material for semiconductors, if the inlet and outlet of cooling water are at the same end, it is easy to fix to the circuit board.

[Eighth Embodiment] As shown in FIG. 13, a meandering hollow portion 2 and a removable portion 4 may be formed inside a metal body 1. In this case, the contact area between the heat medium and the metal body 1 is increased and the heat transfer efficiency is improved. According to the present invention, it is easy to make a part of the flow path thicker or thinner if necessary.

[Ninth Embodiment] As shown in FIG. 14, a plurality of hollow portions 2 and removable portions 4 are formed inside a metal body 1, and the end portion of the finally obtained hollow flow path is formed. It is also possible to form a flow path having a complicated shape by connecting the pipes 16 to each other.

[Tenth Embodiment] As shown in FIG.
It is also possible to form the hollow portion 2 and the removable portion 4 having a complicated meandering shape.

[Eleventh Embodiment] As shown in FIG.
The hollow portion 12 after removing the removable portion 4 may be subjected to inflation tube processing. Specifically, for example, FIG. 3, FIG. 6, FIG.
The hollow member 10 as shown in each of FIG. A groove that matches the planar shape of the hollow portion 12 is previously formed on one side or both sides of the inner surface of the expansion tube type. Further, one end of the hollow portion 12 is closed, and a high-pressure fluid is injected at a stretch from the other end along the hollow portion 12, so that the hollow member 1 is formed on the inner surface of the groove over the entire length of the hollow portion 12.
The hollow member 10 is expanded until 0 is in close contact. Thereby, it is possible to form a hollow flow path having a desired pattern. At the time of inflation, the hollow member 10 may be heated and softened. Alternatively, the removable portion 4 (and the peeling layer) may be set in the mold without being removed, and the removable portion 4 may be removed together with the fluid after the expansion tube. According to such a manufacturing method, there is an advantage that the hollow portion 12 having a large flow passage cross-sectional area can be formed.

As the material of the removable portion 4, a material containing a substance that generates a gas when heated is used, and a gas is generated from the removable portion 4 by heating the metal body 1 after plastic working. By doing so, it is also possible to raise the internal pressure of the hollow portion 12 and subject the metal body 1 to expansion processing.

As a material for generating gas by heating,
Water and organic substances that evaporate when heated above the boiling point, one or more mixtures that decompose or react to generate gas when heated above a certain temperature, explosives and explosives that do not ignite during plastic working . By using such a gas generating agent as the material of the removable portion 4 (or the peeling layer) or adding it to the material of the removable portion 4 (or the peeling layer), the metal body 1 is simply heated. It is possible to increase the internal pressure with. In this case, since the internal pressure is generated at the same time over the entire area of the hollow portion 12, it is not impossible to use the mold as described above at the time of processing the expansion tube.

[Twelfth Embodiment] As shown in FIG.
You may form the several hollow part 2 and the removable part 4 (and peeling layer) at intervals in the thickness direction of the metal body 1. By rolling this hollow member manufacturing material and removing the removable portion 4, the hollow member 10 having a plurality of hollow portions 12 formed at intervals in the thickness direction is obtained. The hollow portion 12 after the removable portion 4 is removed can be further subjected to a swelling process as shown in FIG.

[Thirteenth Embodiment] As shown in FIG.
A large number of hollow portions 2 and removable portions 4 inside the metal body 1.
(And a release layer) may be formed. When this removable material 4 is removed by rolling this hollow member manufacturing material, a hollow member 10 having a large number of hollow parts 12 formed at intervals is obtained, as shown in FIG. The inner surface layer 14 is provided as needed. Different fluids may be flowed to each hollow portion 12. For example, it is possible to exchange heat between two kinds of fluids.

[Fourteenth Embodiment] According to the method of discharging the removable portion 4 after bending the metal body 1, as shown in FIG.
The hollow member 10 having the refraction shape as shown in 1 can be easily formed. [Fifteenth Embodiment] It is also possible to wind the hollow member 10 in a roll shape including the removable portion 4 and mold it into an appropriate shape at the time of use, and then remove the removable portion 4 for use. is there. It is also possible to roll the material in the state of the hollow member manufacturing material, appropriately plastically process it, and remove the removable portion 4 before use.

[0058]

EXAMPLE A core made of a carbon rod was placed inside a casting die, and a molten pure copper was poured into the casting die, as shown in FIG.
A metal body 1 having a hollow portion 2 as shown in was molded. After removing the core, the metal body 1 was erected, and a molten metal of pure copper was poured into the hollow portion 2 to a depth of about 2 cm to form a lid 6 that closes one end of the hollow portion 2. After cooling, all 6 surfaces of the metal body 1 were flat-cut by 5 mm.

Next, barium sulfate powder is uniformly applied to the inner wall surface of the hollow portion 2 to form a release layer, and then a molten metal of a low melting point metal is filled inside the hollow portion 2 to a height of 2 cm from the open end. It was injected and it was made the removable part 4. The composition of this low melting point metal is Sn: 12.0 wt%, Bi: 49.0 wt%, P
b: 18.0 wt%, In: 21.0 wt%, and the melting point is 57 ° C. Further, after the removable portion 4 was solidified, a rectangular parallelepiped pure copper lid 6 was press-fitted into the upper end portion of the hollow portion 2 which was not closed to seal the removable portion 4.

The thus-obtained material for manufacturing a hollow member was cold-rolled at 80% to form a plate having a thickness of about 20 mm. The rolled material for manufacturing a hollow member is further annealed in a weak reducing atmosphere at 350 ° C. for 1 hour, and after cooling, the surface is pickled and further cold rolled to 50%. The thickness was about 10 mm and the length was about 3 m.

The two-stage rolled material for manufacturing a hollow member was bent into a gentle S-shape, and then both ends were cut off.
The whole was poured into boiling water to discharge the low melting point metal. At this time,
Gas pressure was applied from the opposite side of the hollow member manufacturing material. Through the above steps, the external dimensions are about 200 mm in width and about 10 in height.
A hollow member having a length of mm and a length of about 3 m was obtained. In the center of this hollow member, a hollow portion having a width of about 31 mm and a height of about 3.9 mm was formed over the entire length.

[0062]

As described above, according to the material for manufacturing a hollow member and the method for manufacturing a hollow member according to the present invention, when the hollow portion of the metal body is filled with the removable portion, it is plastic to the metal body. Since the processing can be performed, the hollow portion is not closed at that time. Then, by removing the removable portion after the plastic working, it is possible to obtain a hollow member having a free shape and dimensions, which can be applied to any application.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a material for manufacturing a hollow member according to the present invention.

FIG. 2 is a plan view of the same material for manufacturing a hollow member.

FIG. 3 is a front view of a hollow member obtained from the same material for manufacturing the hollow member.

FIG. 4 is a plan view showing another embodiment of the material for manufacturing a hollow member.

FIG. 5 is a front view showing another embodiment of the material for manufacturing a hollow member.

6 is a front view of a hollow member obtained from the material for manufacturing a hollow member of FIG.

FIG. 7 is a front view showing another embodiment of the material for manufacturing a hollow member.

8 is a front view of a hollow member obtained from the material for manufacturing a hollow member of FIG.

FIG. 9 is a front view showing another embodiment of the material for manufacturing a hollow member.

FIG. 10 is a front view showing another embodiment of the material for manufacturing a hollow member.

11 is a front view of a hollow member obtained from the material for manufacturing a hollow member of FIG.

FIG. 12 is a plan view showing another embodiment of the material for manufacturing a hollow member.

FIG. 13 is a plan view showing another embodiment of the material for manufacturing a hollow member.

FIG. 14 is a plan view showing another embodiment of the material for manufacturing a hollow member.

FIG. 15 is a plan view showing another embodiment of the material for manufacturing a hollow member.

16 is a front view of another hollow member obtained from the material for manufacturing a hollow member of FIG. 1. FIG.

FIG. 17 is a front view showing another embodiment of the material for manufacturing a hollow member.

18 is a front view of another hollow member obtained from the material for manufacturing the hollow member of FIG.

FIG. 19 is a front view showing another embodiment of the material for manufacturing a hollow member.

20 is a front view of a hollow member obtained from the material for manufacturing a hollow member of FIG.

FIG. 21 is a perspective view showing another embodiment of the hollow member.

FIG. 22 is a perspective view showing another embodiment of the hollow member.

FIG. 23 is a perspective view showing a hollow member manufacturing material used in Examples.

[Explanation of symbols]

 1 Metal Body 2 Hollow Portion 4 Removable Portion 6 End Plug 10 Hollow Member 12 Hollow Portion 14 Inner Surface Layer 16 Tube 18 Expansion Tube Portion

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Fumifumi Takahashi 128-7 Ogimachi, Aizuwakamatsu, Fukushima 7 Wakamatsu Works, Mitsubishi Shindoh Co., Ltd.

Claims (11)

[Claims] 1. A plastically deformable metal body having a hollow portion formed therein, and a deformable removable portion filled in the hollow portion, wherein the removable portion constitutes the metal body. A material for manufacturing a hollow member, which is formed of a low melting point material having a lower melting point than that of the metal. 2. A plastically deformable metal body having a hollow portion formed therein, and a deformable removable portion filled in the hollow portion, wherein the removable portion constitutes the metal body. A material for producing a hollow member, which is formed of a material that can be dissolved by a solvent that does not dissolve the metal. 3. A plastically deformable metal body having a hollow portion formed therein, and a deformable removable portion filled in the hollow portion, wherein the removable portion is mainly a powder or granular material. A material for manufacturing a hollow member, which is characterized by being configured. 4. A plastically deformable metal body having a hollow portion formed therein, and a deformable removable portion filled in the hollow portion, wherein the removable portion is a fluid. Characteristic material for manufacturing hollow members. 5. A plastically deformable metal body having a hollow portion formed therein, and a peeling layer formed on an inner surface of the hollow portion,
A hollow, wherein the peelable layer is formed of a low melting point material having a melting point lower than that of the metal forming the metal body. Materials for manufacturing parts. 6. A plastically deformable metal body having a hollow portion formed therein, and a peeling layer formed on the inner surface of the hollow portion,
A removable removable portion filled inside the peeling layer, wherein the peeling layer is formed of a material that can be dissolved by a solvent that does not dissolve the metal forming the metal body. Material for manufacturing hollow members. 7. A plastically deformable metal body having a hollow portion formed therein, and a peeling layer formed on the inner surface of the hollow portion,
A material for manufacturing a hollow member, comprising: a deformable removable portion filled inside the peeling layer, wherein the peeling layer is mainly composed of a powder or granular material. 8. A step of forming a hollow portion inside a metal body, a step of forming a removable portion that can be removed in a later step inside the hollow portion, and a step of forming the removable portion therein. A method of manufacturing a hollow member, comprising: a step of plastically deforming a metal body; and a step of removing the removable portion from the plastically deformed metal body. 9. A step of forming a hollow portion inside a metal body, a step of forming a release layer that can be removed in a later step on the inner surface of the hollow portion, and a step of removing the release layer inside the release layer in a later step. Forming a removable portion, plastically deforming the metal body on which the peeling layer and the removable portion are formed, and removing the peeling layer and the removable portion from the plastically deformed metal body And a step of manufacturing the hollow member. 10. The method for producing a hollow member according to claim 8 or 9, wherein the metal body is expanded by injecting a high-pressure fluid into the hollow portion after the removable portion is removed. . 11. The removable portion includes a substance that generates a gas when heated, and by heating the metal body after the step of plastically deforming the metal body on which the removable portion is formed. Generating gas from the removable portion,
The hollow member manufacturing method according to claim 8 or 9, wherein the metal body is expanded by this.