JP2000312928A - Manufacturing method of stamped parts - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for manufacturing a pressed part that eliminates damage due to dropout and wasteful alignment in assembling when pressing a pressed part for assembling a product. SOLUTION: After a metal plate material 6 fed between a die 13 and a punch 14 is punched into a sealing member (pressed part) 4, a die pressing member 17 and a punch pressing member as the die 13 retreats. 16 advance by the biasing of the springs 18 and 19, respectively, and return the punched sealing member 4 to the punched hole. Since the sealing member 4 is aligned and formed while being locked on the metal plate 6, the battery is assembled using the sealing member 4 in a state where the sealing member 4 is aligned on the metal plate 6 without being pulled out. It is transported to the assembly process of the sealing plate (product).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a pressed part for manufacturing a part for assembling a product by pressing, such as a sealing plate for sealing an opening of a battery case accommodating a power generating element of a battery. It is about.

[0002]

2. Description of the Related Art When a large number of pressed parts are manufactured by continuously punching a predetermined shape from a metal plate material by press working,
Pressed parts are successively withdrawn and accumulated under the press mold. When the pressed parts manufactured in this way are parts that require shape accuracy, there is a possibility that scratches or deformation may occur due to the impact when dropped and dropped and the collision in the state of being accumulated separately . Also, when the pressed part is one of the components that make up the product, when assembling it to the product, a large number of pressed parts are removed one by one from the press work, and are picked up one by one from a certain direction. It is necessary to provide the work to the assembly process in line with the above. Specific examples in which such pressed parts pose a problem are described below.

FIG. 2 shows a structure of a sealed portion of a lithium ion secondary battery which is an example of a battery. A battery case 7 formed in a flat bottomed cylindrical body having an oval cross section includes:
An electrode plate group 2 in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween and an electrolytic solution are accommodated. A sealing plate for sealing an open end of the battery case 7 is provided with a sealing member 4 via a gasket 3. A cap 5 serving as a positive electrode terminal of the battery 1 is arranged on the sealing member 4. The sealing member 4 seals the inside of the battery case 7 and electrically insulates the battery case 7 constituting the negative electrode terminal of the battery 1 from the battery case 7.
The battery case 7 is fixed to the open end by caulking to bend the open end of the battery case 7 inward with the gasket 3 interposed therebetween. The sealing member 4 has a burr 10 which is intentionally formed at a predetermined height around the inside of the battery, and the burr 10 bites into the gasket 3 by pressurization by caulking, thereby forming the inside of the battery case 7. Enclosed structure is ensured. The sealing member 4 is manufactured by stamping out a metal plate material such as an aluminum clad material by pressing.

When the sealing member 4 is continuously punched from a metal plate material, the sealing member 4 falls one after another below the press die, and a sharp edge is formed by a drop impact or a collision with another sealing member 4. The burrs 10 formed on the substrate will be chipped or deformed. The burr 10 cuts into the gasket 3 as described above to improve the tightness inside the battery case 1,
It has an important function of preventing leakage of the electrolytic solution sealed in the battery case 7, and if it is damaged, it will lead to a decrease in leakage resistance.

[0005] Further, in the assembly process of the sealing plate, it is necessary to arrange the sealing member 4 on the gasket 3 by regulating its front and back and surface directions. However, the minute sealing members 4 that are punched out are mixed separately. In order to recognize and align the front and back from the state, and to supply the assembly process with the surface direction aligned in a certain direction, it is necessary to manually align the components on the parts tray. However, it is difficult to distinguish between the front and back of the sealing member 4 in which the burrs 10 are formed at a height of about 0.2 mm on a minute part, and there is a risk that a defect may occur in the manufacture of the sealing plate due to an incorrect alignment direction. It is.

In order to solve the problem when the component parts for assembling a product are press parts manufactured by press working as shown in the above specific example, the present inventor has applied a press part stamped by press working. Was developed to return the holes to the punched holes in the metal plate. By returning the pressed part to the punched hole, damage due to dropout is prevented, and the esoteric work of aligning the pressed part as a small part and aligning it from a vibrant state to a constant state is eliminated can do.

The press working method for returning the once punched material to the punched hole itself is the same as the method of manufacturing a laminated iron core disclosed in Japanese Patent Application Laid-Open Nos. 6-16547 and 7-336963. 2. Description of the Related Art There has been known one used as a joining means of an automatic in-mold lamination method for joining each core to be dropped into a laminated state.

[0008]

However, according to the press working method disclosed in the above-mentioned publication, a laminated iron core such as a motor or a transformer is punched into individual iron cores by press working and simultaneously laminated in a die of a press die. It is specified for the manufacture of a laminated iron core used as a fitting portion when performing, and differs in the purpose and effect of the present application.

More specifically, in the method of manufacturing a laminated iron core, the unnecessary thin plate portion finally removed from each iron core is laminated by returning a predetermined shape into a punched hole after being half-punched or completely punched. Since the fitting projections between the cores are formed, the laminated cores are formed into a monolithic laminated core by fitting the fitting projections of the upper core into the recesses formed by the fitting projections of the lower core. You. The unnecessary thin plate portion on which the fitting projection is formed is punched and removed after the laminated core is formed.

On the other hand, the method of manufacturing a pressed part according to the present invention is to return the stamped pressed part to a state in which the stamped part is locked in a punched hole of a base metal plate. In addition to preventing damage due to the metal parts being pulled out, the pressed parts are aligned and held on the metal plate, so when this metal plate is transported to the assembly process using the pressed parts, Pressed parts in which the direction and the plate surface direction are in a fixed state have an effect that they can be assembled without causing an error in the mounting direction.

As described above, the object of the present invention is to prevent the stamped parts from being damaged by returning the stamped parts to the state of being locked in the punched holes of the base metal sheet. Another object of the present invention is to make it easier to assemble a product using the same. Hereinafter, details of the present invention will be described.

[0012]

According to a first aspect of the present invention for achieving the above object, there is provided a method for manufacturing a pressed part, which is manufactured by continuously punching a predetermined shape from a metal plate by pressing. The pressed parts punched out of the metal plate material are pushed back to the state locked in the punched holes, thereby forming the pressed parts on the metal plate in a row, and the metal plate material is conveyed to the assembly process of the structure. It is characterized by the fact that the pressed parts punched out of the metal plate by the press working are returned to the state locked in the punched holes, so that the damage of the pressed parts due to punching out is prevented, and the pressed parts are placed on the metal plate Are manufactured in a state where they are aligned in a certain state. When this metal sheet is conveyed to the assembly process of a product assembled using pressed parts, the pressed parts are aligned in a fixed state, and when removed from the metal sheet, a state corresponding to the assembly direction for assembly is obtained. This makes it possible to cope with automation of assembly.

In the above-described manufacturing method, the press part is returned to the punched hole by placing the metal plate material between the dies of the press die and the periphery of the punch by pressing mechanisms urged in opposing directions. In this state, the pressed component can be punched out by the advancing operation of the die or the punch in the facing direction, and the punched punched component can be pushed back to the punched hole by the advancing of the pressing mechanism in the facing direction accompanying the retreat of the die or the punch.

Further, a burr is intentionally formed around the pressed part in a direction opposite to the punching direction by a press die in which the peripheral edge of the punch is obliquely cut, and the burr portion is inserted into the hole. By pushing back, a state where the stamped stamped part is locked on the metal plate material can be obtained.

According to a second aspect of the present invention for achieving the above object, a sealing member constituting a sealing plate for sealing an opening of a bottomed cylindrical battery case containing a power generating element is formed by pressing a metal. In a method of manufacturing a pressed part manufactured as a pressed part punched from a plate material, the metal plate material is intermittently fed to a processing position of a press working machine at a predetermined pitch, and a peripheral edge portion formed in a punched shape of a sealing member is inclined. By punching a metal member with a cut punch, after punching a sealing member intentionally formed with a burr of a predetermined height around the periphery, the punched sealing member is inserted into a punched hole so that the burr portion is inserted into the punched hole. The sealing member is pushed back to the metal plate side to form a state in which the sealing member is locked at a predetermined pitch on the punched hole of the metal plate material, and this metal plate material is It is characterized in that it is transported to the cutting process, and the sealing member is locked on the metal plate material without being pulled out by pressing, so that the burr is not damaged by falling and the burr is formed into a gasket The battery can be engaged to maintain the leakage resistance of the battery. Also, when the punched sealing member is returned to the punched hole of the metal plate, the sealing member is kept in a fixed state and is aligned on the metal plate, and when this is transported to the sealing plate assembly process. In addition, it is possible to assemble the sealing member in a predetermined direction without recognizing the front and back direction and the surface direction of the sealing member, and it is also possible to automate the assembly of the sealing plate.

In the above-mentioned manufacturing method, the pilot hole is formed in the metal plate material at a pitch corresponding to the pitch at which the sealing member is formed, so that the pilot hole is used as a positioning point or a position recognition point of the sealing member to take out the sealing member from the metal plate material. It can be carried out.

Further, by punching out the sealing member from a metal plate material having a thickness of 0.3 to 1.0 mm, it becomes suitable to manufacture a sealing plate suitable for a flat small battery by the above manufacturing method.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

The method of manufacturing a pressed part according to the present embodiment is to prevent the pressed part manufactured by the press working from being damaged by dropping out by the pressing, and to keep the pressed pressed part in a certain state. It is intended to be manufactured in line with a specific example of improving the quality and productivity of a product assembled using this pressed part, such as a battery sealing plate, a pressed part The case where the present invention is applied to a sealing member will be described.

As shown in FIG. 1, the battery 1 according to the present embodiment is configured as a small and flat lithium ion secondary battery having an oblong cross section so that it can be used as a power source for portable equipment and the like. ing. The electrode group 2 and the electrolyte are accommodated in the battery case 7, and a gasket 3, a sealing member 4, and a cap 5 are provided on the open end side of the battery case 7.
These are fixed by caulking to bend the open end of the battery case 7 inward, and the gasket 3 and the sealing member 4
Thereby, the inside of the battery case 7 is sealed.

FIG. 2 shows that the open end of the battery case 7 is
A sealing plate including a gasket 3, a sealing member 4, and a cap 5 is arranged on the opening end side of the battery case 7 in which the electrode group 2 and the electrolytic solution are accommodated. When the opening end of the battery case 7 is bent inward from the surroundings and caulked, the surroundings of the sealing member 4 and the cap 5 are wrapped in the gasket 3 as shown in FIG. At the same time that the position of the battery case 5 is fixed, the opening end of the battery case 7 is sealed, and the inside of the battery case 7 is sealed. Further, a state in which the battery case 7 is electrically insulated from the sealing member 4 and the cap 5 by the gasket 3 is obtained, and the battery case 7 serving as the negative terminal of the battery 1 and the cap serving as the positive terminal of the battery 1 are provided. 5 is insulated and isolated.

When pressed by this caulking process,
The burr 10 formed around the sealing member 4 is a gasket 3
Therefore, leakage of the electrolytic solution from inside the battery case 7 is effectively prevented. It is necessary that the burr 10 is formed at a uniform height around the sealing member 4. If the burr 10 is chipped or deformed, the bite into the gasket 3 at that portion is weakened. Leakage occurs. Therefore, it is necessary to manufacture the sealing member 4 so that the burr 10 is not chipped or deformed.

FIG. 3 shows the structure of the sealing member 4. When the battery internal pressure rises abnormally due to gas generated in the battery due to improper use of the battery or the like, a safety valve 8 for discharging this gas is provided. It is configured. In order to form the safety valve 8, an opening 11 that forms the safety valve 8 is formed in an aluminum plate, and an aluminum clad material in which the opening 11 is closed and aluminum foil is integrally adhered to the aluminum plate by a cladding method is formed. The sealing member 4 having the shape shown in the figure is manufactured by press working from this aluminum clad material. When the outer shape is punched out by this press working, burrs 10 are intentionally formed around the periphery, and as described above, the sealing property of the battery case 7 by the sealing member 4 is improved, and leakage of the electrolyte is prevented. . Therefore, the sealing member 4 needs to be attached with the formation direction of the burr 10 facing the gasket 3, and the attachment is restricted in the front and back directions. In addition, the oval concave portion 1
Numeral 2 swells toward the inner side of the battery case 7 to join the leads drawn from the positive electrode plate of the electrode plate group 2 to facilitate the lead joining. Therefore, the sealing member 4
Must be mounted such that the concave portion 12 is located on the lead joint hole 20 of the gasket 3 as shown in FIG. 2, and the mounting is restricted in the surface direction.

As described above, since the sealing member 4 needs to be attached while regulating the front and back direction and the surface direction, when the sealing member 4 is manufactured by press working, the front and back direction and the surface direction are changed from the state where the sealing member 4 is pulled out separately. A great deal of labor is required to supply the battery 1 to the assembly process in a certain direction. At the same time as eliminating unnecessary labor for aligning in a certain direction, the burr 1
In order to prevent the occurrence of damage to the O. 0, the manufacturing method by press working is improved. Hereinafter, a method for manufacturing the sealing member 4 will be described.

FIG. 4 shows the structure and operation of a press machine for manufacturing the sealing member 4 by press working.
The operation steps are shown in the order of (a) to (d). The metal plate material 6 formed as an aluminum clad material is fed between the die 13 and the punch 14 by intermittent forward feeding. A die pressing member (pressing mechanism) 17 urged by a spring 19 is disposed inside the die 13, and a punch pressing member (pressing mechanism) urged by a spring 18 around the punch 14. 16 are provided. Also,
As shown in the figure, a cutting portion 9 that is cut obliquely to form a burr 10 intentionally is formed at the peripheral edge portion of the punch 14.

When the metal plate 6 is fed to a predetermined position as shown in FIG. 4A, the press machine advances the die 13 toward the punch 14 as shown in FIG. Die 1
The outer shape of the sealing member 4 is punched between the punch 3 and the punch 14. Around the perforated sealing member 4, the cutting portion 9
As a result, burrs 10 are formed. At the time of this punching,
The die pressing member 17 and the punch pressing member 16 move backward while holding the metal plate 6 sandwiched by the respective urging forces. When the die 13 moves backward, as shown in FIG. , 19, the die pressing member 17 pushes out the punched sealing member 4, and the punch pressing member 16 presses the metal plate 6.
Is pushed out, so that the sealing member 4 is pushed back into the punched hole. Due to the balance between the pressing force of the die pressing member 17 and the punch pressing member 16 urged by the springs 18 and 19 and the frictional force between the sealing member 4 and the punched hole, the sealing member 4 is completely inserted into the punched hole. 4D, the burr 10 formed around the sealing member 4 enters the punched hole, and the sealing member 4 is locked to the metal plate 6 as shown in FIG. 4D. .

FIG. 5 shows the metal plate 6 from which the sealing member 4 has been punched out by the above-mentioned press working. The sealing member 4 is pushed back into the punched hole from which the sealing member 4 has been punched, and the sealing member 4 is inserted into the metal plate 6. Are locked, and many sealing members 4 are aligned. When taking out the sealing member 4 from the metal plate 6, the sealing member 4 can be separated from the metal plate 6 simply by pushing it lightly from the back side. The pilot holes 15 are provided on both sides of the metal plate 6.
Are formed at the same pitch as the formation pitch of the sealing member 4, so that in the battery assembling process, the pilot hole 15 is used as a reference point.
With the automatic assembling device for the sealing plate, the position where the sealing member 4 is taken out from the metal plate material 6 can be determined. Further, by forming the pilot hole 15 before the press working, it can also be used as a position for progressive feeding to the press working machine.

Since the sealing member 4 is aligned and formed on the metal plate 6 by press working as described above, when the sealing member 4 is dropped from the metal plate 6 as in the conventional press working, the impact of dropping and a large number of sealings are caused. The state in which the burrs 10 are damaged when the members 4 are completely accumulated under the press machine is eliminated, and the liquid leakage resistance due to the burrs 10 biting into the gasket 3 in a constant state as described above is maintained. . In addition, since the sealing member 4 is arranged on the metal plate 6 at a predetermined interval, when the metal plate 6 is transported to the sealing plate assembling process as a carrier of the sealing member 4, the front and back and surface directions are placed on the battery case 1. Is easy to assemble with the sealing member 4 attached in a predetermined direction.

In the battery sealing plate according to the present embodiment, the metal plate 6 is manufactured by pressing an aluminum clad material having a thickness of 0.6 mm to form the sealing member 4. Even if aluminum, stainless steel, a steel plate, and their clad materials having a thickness of 0.0 mm are used, the above manufacturing method can be applied. The metal plate 6 is
The same processing can be performed with a hoop material or a plate material having a predetermined length.

In the embodiment described above, an example is shown in which the sealing member 4 of the battery sealing plate having an oval cross section is processed as a pressed part. However, the sealing member of the battery sealing plate having a circular cross section is used as a pressed part. It is also applicable when processing,
When assembling a product such as an electronic device, when manufacturing its component parts by press working, it may require precision, may be small, or may have a restricted mounting direction. At this time, when the above-described method of manufacturing a pressed part is applied, damage due to dropout due to press working is prevented, and assembling work is facilitated, and automation can be easily achieved.

[0031]

As described above, according to the method of manufacturing a pressed part according to the present invention, the pressed part is returned to the state of being locked in the punched hole of the metal plate material from which the pressed part has been punched. Damage to the pressed parts due to dropout is prevented, and furthermore, since the pressed parts are aligned on the metal plate material, in the assembling process of the product assembled using the pressed parts, the front and back direction and the plane direction are aligned. It is taken out and assembled, so that it can be easily adapted to automation of assembly.

[Brief description of the drawings]

FIG. 1A is a plan view showing a configuration of a battery according to an embodiment, and FIG. 1B is a cross-sectional view taken along line AA.

FIG. 2 (a) is a plan view during the assembly of a battery,
(B) is a sectional view taken along line BB, and (c) is a sectional view taken along line CC.

3A is a plan view showing a configuration of a sealing member, and FIG.
Is a sectional view taken along line DD, and FIG. 3C is a sectional view taken along line EE.

FIGS. 4A to 4D are working process diagrams showing working processes by a press machine for manufacturing a sealing member in the order of FIGS.

5A is a plan view showing a state of a sealing member manufactured by press working, and FIG. 5B is a cross-sectional view taken along line FF.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery (product) 4 Sealing member (pressed part) 6 Metal plate material 7 Battery case 9 Cutting part 10 Burr 13 Die 14 Punch 15 Pilot hole 16 Punch pressing member (Pressing mechanism) 17 Die pressing member (Pressing mechanism) 18, 19 Spring

Claims (6)

[Claims] 1. A method for manufacturing a pressed part, which is manufactured by continuously punching a predetermined shape from a metal plate by press working, wherein the pressed part punched from the metal plate by the press working is locked in a punched hole. By pressing it back, the pressed parts are formed in a row on the metal plate material,
A method for manufacturing a pressed part, comprising transporting the metal plate to a product assembling step. 2. A metal plate is disposed between a die or a punch in a direction opposite to a direction in which the metal plate is sandwiched by pressing mechanisms which are disposed in a die of a press die and around a punch and are urged in opposite directions. 2. The method for manufacturing a pressed part according to claim 1, wherein the pressed part is punched out by an advance operation, and the pressed part punched out by the advancement of the pressing mechanism in a facing direction accompanying the retreat of a die or a punch is returned to a punched hole. 3. A press die having a peripheral edge portion of a punch cut off at an angle to intentionally form a burr around a pressed part in a direction opposite to a punching direction, and push the burr portion back into the punched hole. 3. The method for producing a pressed part according to 1 or 2. 4. A sealing member constituting a sealing plate for sealing an opening of a cylindrical battery case having a bottom and containing a power generating element is manufactured as a pressed part formed by stamping a metal plate material into a shape of a sealing member by press working. In the method of manufacturing a pressed part, the metal plate material is intermittently fed to a processing position of a press working machine at a predetermined pitch, and a metal member is cut by a punch in which a peripheral edge of a punched shape of a sealing member is obliquely cut off. By punching, after punching a sealing member intentionally formed with a burr of a predetermined height around the periphery, by pushing the punched sealing member back to a metal plate material so that the burr portion is inserted into the punched hole, metal The sealing member is formed at a predetermined pitch on the punched hole of the plate material in a locked state, and the metal plate material is transported to a battery sealing plate assembly process. Method of manufacturing a less parts. 5. The method of manufacturing a pressed part according to claim 4, wherein a pilot hole corresponding to the pitch of the sealing member is formed in the metal plate. 6. The method according to claim 4, wherein the thickness of the metal plate is 0.3 to 1.0 mm.