JP2510933B2 - Container for chemical conversion of tab terminals for electrolytic capacitors - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved container for forming a tab terminal for an electrolytic capacitor.

[0002]

2. Description of the Related Art A tab terminal 14 is a lead wire 13 formed by applying a copper plating layer and a soldering tin plating layer to the surface of a steel wire.
The aluminum wire 12 is welded to the aluminum wire 12 and the flat portion 11 is formed on the aluminum wire 12 (see FIG. 5).
It is necessary to form an oxide film on the surface of the aluminum wire 12 up to the vicinity of the connection with the lead wire 13, which is called chemical conversion.

For the purpose of efficiently carrying out this chemical conversion process, a conventional magnetic permeable straight cylindrical container 4 as shown in FIG.
2 is used, a large number of tab terminals 14 are accommodated in this container 42, and the lead wire 13 in the container 42 is attracted by the magnetic electrode jig 43 to hold the container 42 upside down. A method has been proposed in which the flat portion 11 protruding outside the container 42 is dipped downward in the chemical conversion solution (Japanese Patent Publication No. 4-24852).

[0004]

However, the tab terminal 14
Since the aluminum wire 12 is thick and the lead wire 13 is thin, when accommodating the tab terminals 14 in the conventional container 42, even if the thick aluminum wires 12 are densely packed,
The intervals between the thin lead wires 13 are sparse. For this reason,
As shown by the middle A, the other lead wire 13 is easily inserted between the lead wires 13 in the upright posture, so that the tab terminal 1
4 tends to have a tilted posture. As a result, the tab terminal 14 of A is not immersed in the chemical conversion liquid up to a predetermined position of the aluminum wire 12, resulting in a defective product of incomplete chemical conversion treatment.

Further, prior to the formation process, the tab terminal 14
It is necessary to wash the oil / fat and impurities adhering to the container with a cleaning liquid.
It would be convenient if they could be washed together. However, while it is necessary to provide a drain hole for discharging the cleaning liquid on the bottom surface of the container 42, the thin tab terminal 14 may fall off from the drain hole.

In view of this, the present invention aims to improve the quality of chemical conversion treatment by erecting the tab terminals in the cylindrical container so that the height of the aluminum wire is uniform.
Furthermore, it is an object of the present invention to discharge the cleaning liquid that has entered the opening container while preventing the tab terminals from falling off.

[0007]

In order to achieve the above object,
The present invention has the following configuration.

A first aspect of the present invention is a chemical conversion container for a tab terminal for an electrolytic capacitor, which is formed by forming an annular ridge on the inner circumference of a cylindrical body of a bottomed cylindrical container made of aluminum.

According to a second aspect of the present invention, an annular projection is formed on the inner circumference of the cylindrical body of a bottomed cylindrical container made of aluminum.
A container for chemical conversion of a tab terminal for an electrolytic capacitor, in which a drainage hole is formed in a peripheral edge of a bottom surface of the cylindrical container, which is located below the protrusion.

According to a third aspect of the present invention, an annular ridge is formed on the inner circumference of the tubular body of a bottomed tubular container made of aluminum.
A container for chemical conversion of a tab terminal for an electrolytic capacitor is provided on the bottom surface of the cylindrical container, in which a large number of drain holes having a diameter smaller than the thickness of the lead wire of the tab terminal to be housed in the container are formed.

[0011]

In the present invention, since the annular projection is formed on the inner circumference of the tubular portion of the cylindrical container, the lead wires are converged by the annular projection when a large number of tab terminals are inserted, and the tip portions of the respective lead wires. Are tightly packed, the tilted posture of the tab terminals is corrected, and all the tab terminals stand upright correctly. As a result, the aluminum wire protruding above the container has a uniform height, and if it is directed downward, it can be immersed in the chemical conversion solution up to the same position, so that the chemical conversion film can be formed at the correct position and defective products will not occur. The quality of the chemical conversion treatment can be improved.

According to the second aspect of the present invention, the drainage hole is formed in the peripheral edge of the bottom surface of the cylindrical container, and the protrusion is formed above the drainage hole. The cleaning liquid that has entered can be discharged to the outside from the drain hole after cleaning, while the movement of the tab terminal is restricted by the protrusion, so that there is no possibility that the tab terminal will fall out through the drain hole.

According to the third aspect of the present invention, since a large number of drain holes each having a diameter smaller than the thickness of the lead wire of the tab terminal are formed on the bottom surface of the cylindrical container, the cleaning liquid can be discharged from the drain holes. The lead wire cannot pass through the drain hole, and there is no risk of it coming off. Moreover, since the bottom surface of the cylindrical container is rough due to the large number of drainage holes, it is possible to prevent the lead wires from slipping and maintain the posture of the tab terminal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a chemical conversion container according to an embodiment of the present invention, in which a lower portion of a tubular body portion 6 of a tubular container 2 is annularly recessed to form an inward protruding ridge 3. A substantially funnel-shaped guide slope 8 is formed on the upper surface of the protrusion 3.

The tubular container 2 is made of aluminum,
Drain holes 5, 5, ... Are drilled in the flat bottom surface 4. The positions of these drain holes 5, 5 ... Are hidden below the ridges 3 when viewed from above, that is, the peripheral edge of the bottom surface 4.

A tab terminal 14 is formed by welding a lead wire 13 to an aluminum wire 12 having a flattened portion 11.
Are tightly inserted so that the lead wire 13 side contacts the bottom surface of the chemical conversion container 1, and the aluminum wire 12 side is projected to the outside of the container 1. During this insertion, the chemical conversion container 1
It is good to add vibration to. As shown in FIG. 4, an electrode jig 21 having magnetism is arranged on the bottom surface of the chemical conversion container 1 accommodating the tab terminals 14 as described above.
Connect to the anode of. In this state, the lead wire 13 is adsorbed and held by the magnetic force of the electrode jig 21, and does not drop even if it is inverted. Further, since the tip of the lead wire 13 is in contact with the bottom surface of the chemical conversion container 1, the tip of the aluminum wire 12 is also aligned at a constant height.

The aluminum wire 12 side of the tab terminal 14 held in the chemical conversion container 1 in this manner is connected to the chemical conversion tank 2
It is immersed in the chemical conversion liquid 24 in No. 3. The cathode of the power source 22 is connected to the chemical conversion liquid 24, and the power source 22 is turned on to turn on the chemical conversion liquid 24.
The portion of the aluminum wire 12 dipped in is formed. At this time, since the height of the aluminum wire 12 is constant as described above, any of the aluminum wires 12 can be immersed in the chemical conversion liquid 24 to the same position. Further, 25 is a mounting jig, and the position of the aluminum wire 12 immersed in the chemical conversion liquid 24 is finely adjusted by bolts 26, 26 screwed into the mounting jig.

As described above, in the first embodiment, a large amount of tab terminals 14 can be efficiently formed, and the tab terminals 14 are securely attracted and held by the magnetic electrode jig 21. Without causing imperfections and variations in holding power,
It is possible to prevent the generation of defective products due to these.

Since the lower portion of the cylindrical body portion 6 in the cylindrical container 2 is depressed in an annular shape to form the inward projecting ridge 3, when a large number of tab terminals 14 are inserted, the lead wire 13 is projected in an annular shape. The lead wires 13 are bundled on the inner end 7 side of the strip 3, and the tips of the lead wires 13 are closely packed with each other. The densely packed lead wires 13 collide with each other and act so as to align their postures in an upright state, so that the inclined postures of the tab terminals 14 are corrected and any of the tab terminals 14 is correctly erected. As a result, the heights of the aluminum wires 12 are uniform, and the aluminum wires 12 of all the tab terminals 14 are also immersed in the chemical conversion liquid 24 to the same position, so that the chemical conversion film can be formed at an accurate position and the quality of the chemical conversion treatment can be improved. Can be improved.

On the other hand, prior to the forming step, the tab terminal 14
Is washed while being stored in the chemical conversion container 1, but in the first embodiment, a drainage hole 5 is formed on the periphery of the bottom surface 4 of the cylindrical container 2, and
Since the drain hole 5 is located below the annular protrusion 3,
The cleaning liquid that has entered the cylindrical container 2 in the cleaning step can be discharged to the outside from the drain hole 5 after cleaning, while the movement of the tab terminal 14 is restricted by the protrusion 3.
There is no danger of falling through. In addition, since the tab terminals 14 can be collectively washed while being housed in the container 1, the directions of the tab terminals 14 do not vary depending on the washing, and the handling is smooth and wasteless.

Further, since the ridge 3 is formed by denting the tubular portion 6 of the tubular container 2, there is an advantage that the production is simple and the cost is low without adding any other member. .

Next, the second embodiment will be described. Figure 2
As shown in FIG. 4, the chemical conversion container 45 of the second embodiment has a ridge 4 on the inner circumference of the cylindrical body portion of the cylindrical container 46 similar to that of the first embodiment.
In addition to providing 9, the bottom surface 47 of the cylindrical container 46,
Drain holes 48, 48 with a diameter smaller than the thickness of the lead wire of the tab terminal
A large number of ... Are punched by pressing. Specifically, when the diameter of the lead wire is 0.4 mm, the hole diameter of the drainage holes 48, 48 ... Is preferably about 0.3 mm.

In this case, the drain holes 48, 4 after cleaning
8 ... can be easily dehydrated, while the tab terminals are drain holes 48
There is no danger of falling through, and a large number of drain holes 4
Since the bottom surface 47 of the cylindrical container is rough due to 8, the advantage is that the tip of the tab terminal can be prevented from slipping and its posture can be maintained.

Next, a third embodiment will be described. Depending on the type of electrolytic capacitor, the tab terminal has various lengths.
Some of them are thick, but since thin tab terminals fit in a large number of chemical conversion containers of the same diameter as tab terminals of general thickness, the thick aluminum wire portion occupies as the number increases. The space is enlarged, and each tab terminal is arranged in a fan-shaped wide open state, and there is a possibility that the position in contact with the liquid surface is not uniform when immersed in the chemical conversion liquid.

In order to prevent such an adverse effect, the number of tab terminals to be supplied to the chemical conversion container may be limited to a certain number or less on the supply device side (not shown). However, if the number of tab terminals is simply reduced, the tab terminals may be reduced. Since the arrangement of is sparse, the alignment action due to the collision of the lead wires cannot be expected. Therefore, the third embodiment is intended to provide a chemical conversion container suitable for forming such a thin tab terminal.

That is, the chemical conversion container 52 of the third embodiment.
Is provided with inwardly projecting ridges 50 and 51 on the upper and lower portions of the peripheral wall 53, respectively. This chemical conversion container 52
In addition, the same number of thin tab terminals as in the case of accommodating the tab terminals 14 having a general thickness in the chemical conversion container 1 of the first embodiment are supplied.

Here, in the third embodiment, the ridge 50 is provided on the upper part in addition to the ridge 51 on the lower part, so that the diameter is substantially narrowed. Therefore, even if the tab terminals are thin, the arrangement does not become sparse, and the tabs 51 at the bottom always hold the tab terminals tightly.

In this way, in the third embodiment, even with a thin tab terminal, the number below a certain number can always be held tightly, so that the aluminum wire portion does not open greatly and a uniform chemical conversion treatment is possible. . Furthermore, since the outer diameter of the cylindrical container itself is the same as that of the first and second embodiments, it is possible to handle various kinds of tab terminal forming processes in a unified manner with a common electrode jig and a transfer device. There are advantages.

Although the chemical conversion container 1 is entirely made of aluminum in the first to third embodiments, the cylindrical container 2 is made of a magnetically permeable material or a conductor containing a magnetically permeable material. Other metals (eg copper, brass) etc. can also be used. However, when aluminum is used as in the present invention, there is an advantage that the chemical conversion container can be manufactured at a relatively low cost, is suitable for mass consumption, and has good spreadability, so that the ridge can be easily processed.

[0030]

As described above in detail, in the first invention described in claim 1, since the annular projection is formed on the inner circumference of the cylindrical body portion of the cylindrical container, the lead is formed when a large number of tab terminals are inserted. The wires are bundled by the annular ridges, the tips of the lead wires are closely packed with each other, and they act so as to align their postures in an upright state.Thus, the tilted posture of the tab terminals is corrected and any tab terminal is Stand upright. As a result, the aluminum wires have a uniform height and can be dipped in the chemical conversion solution up to the same position, so that the chemical conversion film can be formed at an accurate position, and defective products do not occur, and the quality of chemical conversion treatment can be improved.

According to the second aspect of the present invention, the drainage hole is formed in the peripheral edge of the bottom surface of the cylindrical container, and the protrusion is formed above the drainage hole. The cleaning liquid that has entered can be discharged to the outside from the drain hole after cleaning, while the movement of the tab terminal is regulated by the protrusion, so that the tab terminal does not fall out through the drain hole.

According to the third aspect of the present invention, since a large number of drain holes having a diameter smaller than the thickness of the lead wire of the tab terminal are formed on the bottom surface of the cylindrical container, the cleaning liquid can be discharged from the drain holes. The lead wire cannot pass through the drainage hole, and there is no risk of falling out. In addition, since the bottom surface of the cylindrical container becomes rough due to the large number of drainage holes, it is possible to prevent the lead wire from slipping and maintain the posture of the tab terminal.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a usage state of a chemical conversion container according to a first embodiment.

FIG. 2 is a front sectional view showing a chemical conversion container of a second embodiment.

FIG. 3 is a front sectional view showing a chemical conversion container of a third embodiment.

FIG. 4 is a front sectional view showing a chemical conversion step using the chemical conversion container of the embodiment of the present invention.

FIG. 5 is a front cross-sectional view showing a usage state of the chemical conversion container before improvement according to the present invention.

[Explanation of symbols]

 1,45,52 Chemical conversion container 2,46 Cylindrical container 3,49,50,51 Ridge 5,48 Drainage hole

Claims (3)

(57) [Claims] 1. A container for chemical conversion of a tab terminal for an electrolytic capacitor, which is formed by forming an annular projection on the inner circumference of a cylindrical body of a bottomed cylindrical container made of aluminum. 2. A bottomed cylindrical container made of aluminum is formed with an annular projection on the inner circumference of a cylindrical body portion, and a drain hole is formed in the bottom peripheral edge of the cylindrical container looking below the projection. A container for chemical conversion of tab terminals for electrolytic capacitors. 3. A bottomed cylindrical container made of aluminum is formed with an annular ridge on the inner circumference of a cylindrical body, and a lead wire of a tab terminal to be accommodated in the container is formed on the bottom surface of the cylindrical container. A container for chemical conversion of tab terminals for electrolytic capacitors, which has a large number of drain holes with a diameter smaller than the thickness.