JPH1145836A - Manufacture of electrode terminal for electrolytic capacitor and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode terminal for an electrolytic capacitor and its quipment, wherein a cutting blade for molding an end part of the electrode terminal is made unnecessary. SOLUTION: Upper and lower molds 23, 24 having U-shaped notches 23a, 24a at the tips are fixed face to face on upper and lower retaining tables 21, 22. Strippers 25, 26 which are freely slidable on the central parts of the upper and lower molds 23, 24 and are energized with springs 27, 28 so as to protrude from the U-shaped notches 23a, 24a at the tips of the upper and lower molds 23, 24 are installed on the upper and lower retaining tables 21, 22. The retaining tables 21, 22 are moved mutually so as to approach and separate, and either one of the strippers 25, 26 is pressed against the springs 27, 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an electrode terminal for an electrolytic capacitor.

[0002]

2. Description of the Related Art Conventionally, a method of manufacturing an electrode terminal for an electrolytic capacitor is as follows.
A lead wire made of a P wire is welded, and the vicinity of the other end is pressed to form a flat portion. Further, the flat portion is subjected to a chemical conversion treatment to form an oxide film on the surface. This flat portion is welded to the capacitor element, and the lead wire is projected outside to use as an electrode terminal of the electrolytic capacitor.

[0003] Conventionally, a flat portion to be welded to a capacitor element is formed as shown in FIG.
That is, as shown in FIG. 4 (a), the flat portion is formed by a punch member having an end face formed of an upper punch 41 and a lower punch 42 having a rectangular shape, and a U-shaped end face along the outer peripheral portion of the punch member. The cutting is performed by the cutting blade 43 on which the cutting edge 43 is located. The Al round bar 40 is inserted between the upper punch 41 and the lower punch 42, and the Al round bar 40 is
Hold down the press part of and lower it.

When the Al round bar 40 has passed through the cutting blade 43, the upper and lower punches 41, 42 as shown in FIG.
Presses the Al round bar 40 with the flat portion 40 having a predetermined thickness.
a is formed. At this time, the end 40 b of the Al round bar 40 protrudes outside the punches 41 and 42. Next, when the upper and lower punches 41 and 42 return to their original positions while being pressed,
As shown in FIG. 4C, the Al round bar 4 is
The protruding end portion 40b of 0 is cut. FIG. 4 (d)
FIG. 5 is a perspective view of the electrode terminal 44 having the flat portion 40a formed in this manner. Note that reference numeral 45 denotes CP
It is a lead wire made of a wire and is welded to the end of the Al round bar 40 before pressing.

[0005] By the way, the Al round bar 4
When the flat portion 40a is formed on the upper and lower punches 41 and 4,
End portion 40b of Al round bar 40 protruding outside from between 2
Is pressed from one side to the other, so that the cut surface becomes a clean cut surface without an edge at the portion where the cutting blade 43 enters, but the cut end portion is as shown in the cross-sectional view of FIG. Burrs 40c are generated. If the flat portion 40a having such burrs 40c is encapsulated by welding to a capacitor element (aluminum foil), the capacitor element may be damaged and a product defect may occur.

Therefore, there has been proposed an apparatus for manufacturing an electrode terminal for an electrolytic capacitor in which burrs are not generated when a flat portion is formed. In this manufacturing apparatus, cutting blades are arranged along the outer peripheral portions of the upper punch and the lower punch, and the cutting blade is provided with an upper blade and a lower blade vertically. The pressing of the Al round bar is performed where the Al round bar is located between the upper blade and the lower blade of the cutting blade.

[0007] When the Al round bar is pressed and formed into a flat shape, the cutting blade descends, and the portion protruding outside from between the upper punch and the lower punch is first half cut by the upper blade. Next, the cutting blade is raised to completely cut off the protruding portion.

Since the electrode terminal is manufactured from the Al round bar in this manner, edges are not formed on both sides of the electrode terminal, and when used as an electrode terminal for an electrolytic capacitor, the occurrence of product defects is reduced. Can be.

[0009]

However, in the method of cutting off the end of the flat electrode terminal with the cutting blade, burrs are generated at the end when the blade is worn. For this reason, it is necessary to constantly monitor the state of the blade, and at the time of wear, it is necessary to replace the cutting blade, which is complicated.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method and apparatus for manufacturing an electrode terminal for an electrolytic capacitor which does not require a cutting edge.

[0011]

In order to solve the above-mentioned problems, the present invention employs the following means. The apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to claim 1, wherein the upper and lower molds each having a U-shaped notch at the end are fixed to the upper and lower support bases in opposition, and the center of the upper and lower molds is fixed to the upper and lower support bases. A stripper slidably slidably and urged by a spring so as to protrude from the U-shaped notch at the tip of the upper and lower dies, so that the support bases move toward and away from each other, and It is characterized in that one of them is pressed against the spring.

According to a second aspect of the present invention, there is provided an apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to the first aspect of the present invention, wherein a guide member for supporting and guiding the electrode terminal is provided on the upper and lower mold sides. Is characterized in that when the stripper is pushed in, the stripper moves in the same direction in synchronization with the stripper.

According to a third aspect of the present invention, there is provided a method of manufacturing an electrode terminal for an electrolytic capacitor, wherein the flattened electrode terminal is fixed to opposed upper and lower support bases, and a U-shaped cut portion is formed at a tip end surface. Holding the upper and lower molds while pressing the upper and lower molds with a stripper provided at the center of the upper and lower molds, and cutting the U-shaped cut portions into both sides of the electrode terminal while leaving a constant thickness; and The center part of the electrode terminal is moved in one direction by pushing one of the strippers slidably provided at the center part of the electrode terminal, and a predetermined thickness part left in the cut part is sheared. It is characterized by:

[0014]

The present invention is configured as described above.
First, an electrode terminal having a flat shape and an elliptical flat surface formed in the previous process is guided between the stripper and the upper and lower molds while supporting one end of the electrode terminal by a guide member. Next, the upper and lower support bases are moved in a direction in which the upper and lower U-shaped cut portions approach each other until the interval between the upper and lower U-shaped cut portions becomes equal to or less than the thickness of the electrode terminal. Both sides of the electrode terminal are sandwiched by strippers,
The upper and lower U-shaped cut portions cut into the U-shape from both sides of the electrode terminal. At that time, the stripper is pressed against the surface of the electrode terminal and retreats inward from the upper and lower U-shaped cut portions against the urging force of the spring. The opening of the upper and lower U-shaped cutouts is in the lead wire direction of the electrode terminal.

Subsequently, one of the strippers elastically in contact with the center of the electrode terminal is pushed in to move the center of the electrode terminal in one direction, so that the center and the periphery of the electrode terminal are U-shaped. Shear at the notch. At this time, since the guide member supporting the electrode terminal is moved in the same direction in synchronization with the stripper on the pushing side, an unreasonable posture of the electrode terminal at the time of shearing does not occur.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to the present invention, in which (a) and (b) show the operation of the apparatus in a manufacturing process in the order of steps. It is. FIG. 2 is a view showing a step of rolling the tip end into a flat shape before sending the electrode terminal into the manufacturing apparatus 10, and FIG. 3 is a side view showing the state of FIG. 1 (b).

First, in the step of forming a prototype of the electrode terminal 11, one end of the Al round bar 12 cut to an appropriate length is provided with a C having a diameter of about 1/3 of the Al round bar 12.
The P lead wire 13 is welded. Next, as shown in the side view of FIG. 2A, the Al round bar 12 is sandwiched and supported by a guide member including a front guide upper part 14 and a front guide lower part 15, and includes an upper punch 16 and a lower punch 17. Then, the Al round bar 12 is rolled by the upper punch 16 and the lower punch 17 to form a flat portion 12a.
FIG. 2B shows an electrode terminal 1 formed by this process.
1 is a plan view, and the plane of the flat portion 12a is elliptical.

Next, the electrode terminal 11 formed by the above-described process is molded by an apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to the present embodiment to make it close to a finished product. Apparatus 10 for manufacturing electrode terminal for electrolytic capacitor according to this embodiment
Has a pair of upper and lower supports 21 and 22 composed of an upper support 21 and a lower support 22 as shown in FIG. 1A, and these upper and lower supports 21 and 22 are not shown in the drawings. It is configured to move toward and away from the device.

The upper support 21 has an upper die 23 having a U-shaped notch 23a at the tip, and the lower support 22 also has a lower die having a U-shaped notch 24a at the tip. 24 are fixed by bolts 30 so as to face each other.
The upper and lower supports 23 and 22 are provided on the upper and lower supports 23 and 22, respectively.
4, a stripper 25 slidably formed at the center of
26 are attached. These strippers 25,
26 has rectangular parallelepiped parts 25a and 26a,
Bolts 25b, 26b are fixed to one surface of 5a, 26a, and the ends thereof pass through through holes 21a, 22a provided in the upper and lower supports 21, 22. , 26c.

The bolts 25a and 26a are fitted with springs 27 and 28, respectively.
The strippers 25, 26 are biased so that the tip surfaces of the rectangular parallelepiped portions 25a, 26a project from the U-shaped cut portions 23a, 24a at the tips of the upper and lower dies 23, 24. Actually, the rectangular parallelepiped portions 25 of the strippers 25, 26
a, 26a and the top surfaces of the U-shaped cut portions of the upper and lower dies 23, 24 are flush with each other. The portions corresponding to the openings of the U-shaped cut portions 23a and 24a are the electrode terminals 1
1 is an insertion direction for molding.

Then, as shown in FIG. 2, the flat portion 12a of the electrode terminal 11 having the elliptical flat portion 12a formed by rolling at the front end portion is connected to the upper front guide 14 and the lower front guide 15 shown in FIG. The guide member is formed to support the end of the Al bar 12 and guide it between the strippers 25 and 26.
Next, as shown in FIG.
Is moved in the approaching direction (the direction of the arrow A) until the interval between the end faces of the U-shaped cut portions 23a, 24a of the upper and lower dies 23, 24 becomes about a fraction of the thickness of the flat portion 12a. When,
The tip surfaces of the upper and lower dies 23 and 24 are flat portions 1 of the electrode terminals 11.
2a is cut into a U-shape from both sides. At this time, the upper and lower strippers 25 and 26 are pressed against the surface of the flat portion 12a and resist the urging force of the springs 27 and 28, and the tips of the U-shaped cut portions 23a and 24a of the upper and lower dies 23 and 24. The tip surface is receded inside the surface.

Next, as shown in FIG. 1C, the tips of the bolts 25b of the upper stripper 25 projecting from the outer surface of the upper support 21 are pushed in the direction shown by the arrow B. When the bolt 25b is pushed in, the distal end surface of the rectangular parallelepiped portion 25a of the stripper 25 pushes the central portion of the flat portion 12a of the electrode terminal 11 (see FIG. 2B) downward.
Since the positions of the upper and lower dies 23 and 24 are kept as they are, the flat portion 12a in which the upper and lower dies 23 and 24 have grooves cut in a U-shape from both sides is formed by the peripheral portion 12a at the groove.
b and the center are sheared. The lower stripper 26
Is supported by the lower support base 22 with the spring 28 interposed therebetween, and thus can be pushed by the flat portion 12a from above and move in the arrow C direction against the urging force of the spring 28. That is, the upper stripper 25 can be pushed in.

As shown in FIG. 3 (a), when the flat portion 12a is sheared, the electrode member 11 is formed by the front guide upper portion 14 and the front guide lower portion 15 of the Al round bar 12. Since the end is retained, the upper stripper 2
If the position is not changed when 5 is pushed in, the flat portion 12a will be damaged. Therefore, when the upper stripper 25 is pushed in, the upper front guide 14 and the lower front guide 15 are also synchronously lowered by the same stroke.

When the shearing of the central portion and the peripheral portion of the flat portion 12a is completed, as shown in FIG. 1 (d), the upper and lower support bases 21 and 22 are moved apart in the vertical direction, and the electrode terminals 11 are moved.
When it is taken out, it is molded into a shape as shown in FIG. The peripheral portion 12b of the flat portion 12a shown in FIG. 1D is blown off in a predetermined direction by air and collected.

As described above, the apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to the present embodiment does not cut by the cutting blade when forming the peripheral portion of the flat portion 12a of the electrode terminal 11 without cutting with a cutting blade. Since the groove is cut from both sides and sheared at that portion, no burr is generated at both ends of the flat portion 12a. For this reason, it is possible to reduce the occurrence of defects of the electrolytic capacitor using the electrode terminals 11 manufactured by this device.

In the above embodiment, the upper stripper 25 is pushed downward to shear, but the lower stripper 26 may be pushed upward. In this case, the upper and lower front guides 14, 15 Need to be moved in the same direction in synchronization with the movement of the lower stripper 27.
In the above-described embodiment, the names of the members such as the upper and lower supporters 21 and 22 and the upper and lower strippers 25 and 26 are given with the moving direction being the up and down direction. It is also possible to use the left and right.

[0027]

As described above, according to the present invention,
The peripheral molding of the flat portion formed at the tip of the electrode member for the electrolytic capacitor is performed by a shearing process, not by a cutting process using a cutting blade. The occurrence of defective capacitors can be reduced. Further, since a cutting blade with a worn cutting edge is not used, there is no need for monitoring, and no replacement work is required, so that the efficiency of the manufacturing work can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to the present invention.
(B) shows the operation of the device in the manufacturing process in the order of the processes.

FIGS. 2A and 2B are diagrams showing a pretreatment process of an electrode terminal performed before manufacturing by the present manufacturing apparatus, wherein FIG. 2A shows a pressing process for flattening the tip of the electrode terminal, and FIG. It is a top view of the electrode terminal formed in the process.

FIG. 3 is a side view of the apparatus for manufacturing an electrode terminal for an electrolytic capacitor shown in FIG. 1 (b).

FIG. 4 is a view showing a conventional method for manufacturing an electrode terminal for an electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manufacturing apparatus of electrode terminal for electrolytic capacitors 11 Electrode terminal 12 Al round bar 12a Flat part 12b Peripheral part 13 Lead wire 14 Upper front guide 15 Lower front guide 16 Upper punch 17 Lower punch 21 Upper support 22 Lower support 23 Upper Type 23a U-shaped notch 24 Lower die 24a U-shaped notch 25 Upper stripper 26 Lower stripper 27, 28 Spring

Claims (3)

[Claims] An upper and lower mold having a U-shaped notch at its tip is fixedly opposed to an upper and lower support, and a center of the upper and lower mold is slidably mounted on the upper and lower support by a spring. A stripper biased so as to protrude from the U-shaped notch at the tip of the mold is provided so that the support bases can be moved toward and away from each other, and one of the strippers can be pressed against the spring. An apparatus for manufacturing an electrode terminal for an electrolytic capacitor, characterized in that: 2. A guide member for supporting and guiding an electrode terminal is provided on a side of the upper and lower molds, and the guide member moves in the same direction in synchronization with the stripper when the stripper is pushed in. The apparatus for manufacturing an electrode terminal for an electrolytic capacitor according to claim 1. 3. A rolled and flattened electrode terminal is clamped by a stripper provided at the center of an upper and lower die having a U-shaped notch formed at a tip end surface and fixed to opposed upper and lower supports. Either a step of pressing the upper and lower molds so that the U-shaped cut portions are cut into both sides of the electrode terminal while leaving a constant thickness, and a stripper provided so that the center of the upper and lower molds is slidable. And moving the central portion of the electrode terminal in one direction by shearing the same, and shearing a fixed thickness portion left in the cut portion.