JP2001009793A - Manufacturing method of perforated foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture perforated foil large in freedom of size, pitches, etc., of holes without causing cost increase. SOLUTION: Metallic foil 5 is arranged on a metallic mold 4 having a punching hole 4a, when an elastic body 3 arranged on the metallic foil 5 is pressurized from above, the elastic body 3 is pushed in the punching hole 4a with the metallic foil 5, the metallic foil 5 is punched out by shearing force between the elastic body 3 pushed in the punching hole 4a and an edge part of the punching hole 4a, and a hole 5a corresponding to the punching hole 4a is formed on the metallic foil 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a perforated foil used for an electrode or the like of a Li-ion battery.
The present invention relates to a method for manufacturing a perforated foil, which can efficiently produce a perforated foil having a large degree of freedom such as a hole size and a pitch without increasing costs.

[0002]

2. Description of the Related Art Conventionally, perforated foils have been produced by a method of forming holes by press working using a metal mold having irregularities (referred to as punching metal), or by a chemical treatment such as etching. Is used to form a hole by dissolving a part of the material.

[0003]

However, according to the conventional method for manufacturing a perforated foil by press working, it is necessary to reduce the accuracy of 1/10 of the material to be punched in order to prevent the occurrence of burrs during press working. Since it is necessary to combine a male mold and a female mold, in order to prevent the occurrence of burrs especially when the material is a thin foil of 10 to 30 μm, a combination accuracy of 1 to 3 μm is required, and the cost of the mold is high. In addition, there are problems that it is difficult to maintain the accuracy of the mold and the diameter and pitch of the holes to be punched cannot be reduced.

On the other hand, according to the conventional method for producing a perforated foil by a chemical treatment, many steps such as masking before the chemical treatment, forming a hole by the chemical treatment, and removing the masking after the hole formation are required. Therefore, there is a problem in that the production time is long, and the cost for treating and maintaining the liquid used for the chemical treatment is high.

Accordingly, an object of the present invention is to provide a method for manufacturing a perforated foil capable of efficiently producing a perforated foil having a large degree of freedom in terms of hole size and pitch without increasing the cost. Is to provide.

[0006]

According to the present invention, in order to achieve the above object, a metal foil is placed on a die having a punched hole and pressurized, and the metal foil is pressed against the die. In the method for manufacturing a perforated foil for forming a hole, the metal foil is arranged on the mold, an elastic body is arranged on the metal foil, and the elastic body is placed on the opposite side of the mold. A method for manufacturing a perforated foil is provided, wherein the hole is formed in the metal foil by deforming the elastic body into the punched hole of the mold by pressing. According to the above configuration, when pressure is applied from above the elastic body disposed on the metal foil, the elastic body is pushed together with the metal foil into the punched hole of the mold, and the elastic body pushed into the hole and the edge of the punched hole are pressed. The metal foil is punched by a shearing force between the metal foil and a hole corresponding to the punched hole is formed in the metal foil.

[0007]

FIG. 1 shows a manufacturing apparatus according to a first embodiment of the present invention. The manufacturing apparatus 1 includes a pair of upper rolls 2 that rotate in a direction indicated by an arrow in FIG.
A and a lower roll 2B, an annular elastic body 3 that rotates and moves in the direction of the arrow shown by rotation of the upper roll 2A, and an annular body of a predetermined thickness that rotates and moves in the direction of the arrow shown by rotation of the lower roll 2B. Mold 4. In mold 4,
A plurality of punched holes 4a are formed two-dimensionally.

Next, the manufacturing apparatus 1 configured as described above
Will be described with reference to the drawings.

FIG. 2 shows the details of the drilling step. As shown in FIG. 1, a metal foil 5 is sandwiched between the elastic body 3 and the mold 4,
When the metal foil 5 is sent out while being pressed by the rotating rolls 2A and 2B, as shown in FIG. 2, the elastic body 3 is deformed and the deformed portion 3a inserts the portion 5b of the metal foil 5 into the punched hole 4a of the mold 4. Push in. The portion 5 of the metal foil 5 is formed by shearing the green portion of the punched hole 4a and the deformed portion 3a of the elastic body 3.
b falls and the hole 5a is formed.

FIG. 3 shows a perforated foil 5 obtained in the perforating step.
Is shown. By pressing the metal foil 5 with the rolls 2A and 2B while rotating and moving the elastic body 3 and the mold 4,
As shown in FIG. 3, a plurality of holes 5a are continuously formed two-dimensionally in the metal foil 5.

According to the above-described first embodiment, by performing the press working using the simple mold 4 and the elastic body 3, compared with the conventional press working method or the chemical processing method. A long perforated foil that is inexpensive and has a high degree of freedom in terms of hole size and pitch can be continuously produced.

FIG. 4 shows a manufacturing apparatus according to a second embodiment of the present invention. In the manufacturing apparatus 1, in the first embodiment, an annular elastic body 6 that rotates and moves in a direction indicated by an arrow in the figure by rotation of the lower roll 2 </ b> B is arranged between the lower roll 2 </ b> B and the annular mold 4. Other configurations are the same as those of the first embodiment.

FIG. 5 shows a manufacturing process according to the second embodiment. When the metal foil 5 is sandwiched between the elastic body 3 and the mold 4 and the metal foil 5 is sent out while being pressed by the rotating rolls 2A and 2B, the elastic body 3 is deformed as shown in FIG. 3a inserts a portion 5b of the metal foil 5 into a punched hole 4a
Push in. At the same time, the lower elastic body 6 is also deformed, and the deformed portion 6a supports the portion 5b of the metal foil 5. After that, similarly to the first embodiment, the metal foil 5 is formed by shearing the green of the punched hole 4a and the deformed portion 3a of the elastic body 3.
5b is dropped, the hole 5a is continuously formed in the metal foil 5, and the metal foil 5 in which the plurality of holes 5a are formed two-dimensionally is obtained.

According to the above-described second embodiment, the first
Without breaking the metal foil 5 as compared with the embodiment of
The hole 5a can be formed stably. That is, according to the above-described first embodiment, depending on the size of the hole 5a and the thickness of the metal foil 5, the metal foil 5 may be torn from the deformed portion 5b during processing, or the outer peripheral portion of the hole 5a of the metal foil 5 May not be cut by the shearing process, and the removed scum may not be completely separated. Deformed portion 5b of metal foil 5
The metal foil 5 is broken by the deformed portion 3a of the elastic body 3.
Because the central part of the deformed part 5b is more strongly pushed,
It is considered that the metal foil 5 is broken before shearing occurs in the green portion of the punched hole 4a of the mold 4. In addition, the reason why a part remains without being completely sheared may be that the entire outer peripheral portion of the deformed portion 5b is simultaneously cut by the shearing process. It is considered that a part of the die 3 is released because the force pushed into the punched hole 4a of the mold 4 is released. Then, the metal foil 5 pushed into the punched hole 4a of the mold 4 is supported by the elastic body 6 provided on the opposite side of the mold 4, so that the center of the portion 5b of the metal foil 5 pushed into the punched hole 4a. The stress most applied to the portion can be reduced, and the metal foil 5 can be prevented from breaking. Even if a part of the metal foil 5 starts shearing first, since the metal foil 5 pushed into the punched hole 4a is pressed from both sides by the elastic bodies 3 and 6, the force by the elastic bodies 3 and 6 is not changed. Punched hole 4 without being released
a, the entire outer peripheral portion of the portion 5b of the metal foil 5 can be uniformly cut, so that a stable hole 5a can be formed.

[0015]

EXAMPLE An example corresponding to the second embodiment will be described. The elastic members 3 and 6 have a width of 100 made of hard rubber.
The mold 4 was 100 mm wide having 3 mm holes 4a at 5 mm intervals. A copper foil having a thickness of 30 μm is passed between the elastic body 3 and the mold 4,
Pressure was applied at A and 2B. Thereby, the metal foil 5 in which the holes 5a were continuously formed could be manufactured.

The elastic body need not be a sheet-like body, but may be a roll-like body with an elastic body lining. Further, the metal foil may be other metals such as gold and aluminum other than copper.

[0017]

As described above, according to the method for manufacturing a perforated foil of the present invention, a hole is formed in a metal foil by applying pressure using a simple mold and an elastic body. Thus, it is possible to efficiently manufacture a perforated foil having a large degree of freedom such as a hole size and a pitch without increasing the cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a manufacturing apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG. 1;

FIG. 3 is a perspective view of a main part of a perforated foil obtained by a perforating step according to the first embodiment;

FIG. 4 is a view showing a manufacturing apparatus according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2A Upper roll 2B Lower roll 3 Elastic body 4 Die 4a Punched hole 5 Metal foil 5a Hole 6 Elastic body

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Tadao Otani 3550 Kida Yomachi, Tsuchiura-shi, Ibaraki Hitachi Cable System Materials Laboratory (72) Inventor Makoto Oba 3550 Kida Yomachi, Tsuchiura-shi, Ibaraki Hitachi Cable, Ltd. 3C060 AA16 AA20 BA01 BB12 BB19 BD03 BG03 BH01 5H017 AA03 BB06 BB19 CC01 CC05 EE01

Claims (3)

[Claims] 1. A method for producing a perforated foil, wherein a metal foil is placed on a die having a punched hole and pressure is applied to form a hole corresponding to the punched hole in the metal foil. Along with disposing the metal foil on a mold, disposing an elastic body on the metal foil, pressing the elastic body from the opposite side of the mold to place the elastic body in the punched hole of the mold. A method for producing a perforated foil, wherein the hole is formed in the metal foil by deforming. 2. The method according to claim 1, wherein the mold and the elastic body have an annular shape, and the hole is formed in the metal foil by rotating the annular mold and the elastic body while rotating the annular mold. 2. The method for producing a perforated foil according to claim 1, wherein said metal foil is sandwiched between elastic bodies. 3. The method according to claim 1, wherein the mold has a predetermined thickness, and the hole is formed in the metal foil by disposing a lower elastic body under the mold having the predetermined thickness. 2. The method for manufacturing a perforated foil according to claim 1, wherein a portion of the foil pushed into the punched hole by pressurization from the opposite side of the mold is supported by a portion of the lower elastic body entering the punched hole.