JPH0684728A - Container for chemically converting tab terminal for electrolytic capacitor - Google Patents

Abstract

PURPOSE:To discharge a cleaning liquid from the title container so as to shorten the drying time required for removing the cleaning liquid. CONSTITUTION:Numerous drain holes 5, 5,... having diameters smaller than the thicknesses of the lead wires 13 of tab terminals 14 are bored through the bottom 4 of a cylindrical container 2. Since the holes 5 are formed through the bottom of the container 2, a cleaning liquid can be quickly discharged from the container after cleaning and the drying time of the tab terminals 14 can be remarkably shortened, resulting in an improvement in the manufacturing efficiency of the tab terminals 14. On the other hand, since the diameters of the holes 5 are smaller than the thicknesses of the lead wires 13 of the terminals 14, the lead wires 13 do not pass through the holes 5 and the terminals 14 do not drop down from the container 2. In addition, since the bottom surface 4 of the container 4 becomes rough due to the holes 5, slipping of the front ends of the lead wires 13 can be prevented and the terminals 14 are maintained in standing states.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Tab terminals 1 which are parts of electrolytic capacitors
As shown in FIG. 3, the aluminum wire 12 is welded to a lead wire 13 made of an iron wire or the like plated with copper and solder tin, and a flat portion 11 is formed on the aluminum wire 12 by pressing. It was done. It is necessary to form an oxide film on the surface of the aluminum wire 12 from its tip to the vicinity of the connection with the lead wire 13, and this treatment is called chemical conversion.

In order to efficiently carry out this chemical conversion process, a magnetically permeable cylindrical container 42 as shown in FIG.
While accommodating a large number of tab terminals 14 in this container 42,
With the magnetic electrode jig 43, the lead wire 13 in the container 42
It is proposed that the container 42 is held upside down by suctioning and the flat part 11 protruding outside the container 42 is directed downward and immersed in the chemical conversion liquid (Patent Publication 4-
24852).

[0004]

By the way, it is necessary to remove impurities such as oil and fat adhering to the tab terminals 14 prior to the chemical conversion step, and to remove the chemical liquid adhering to the tab terminals 14 after the chemical conversion step. As a pretreatment and a posttreatment of the chemical conversion process, the tab terminal 14 is washed with a washing liquid.

In this cleaning process, if the tab terminals 14 are individually cleaned, the postures of the tab terminals 14 become misaligned, which may complicate handling and break the tab terminals 14. A large number of tab terminals 14 are bundled and housed in a chemical conversion container 42 in advance.
Attempts have been made to wash all 4 together with the container 42.

However, the conventional chemical conversion container 42 has a drawback that the cleaning liquid cannot be sufficiently discharged even if the container 42 is placed in a centrifuge because no consideration is given to drainage after cleaning. If the tab terminal 14 is left in the container 42 for several hours while the cleaning liquid is not sufficiently discharged, the action of the cleaning liquid may cause rust at the cut end of the lead wire 13. Therefore, when the tab terminals 14 are left in the container 42 after cleaning and dried by a dryer, it takes a long time to completely remove the cleaning liquid accumulated in the container 42 by drying, which causes a decrease in manufacturing efficiency. Was there.

Therefore, an object of the present invention is to promptly discharge the cleaning liquid contained in the container when cleaning the tab terminal together with the chemical conversion container, thereby shortening the drying time of the tab terminal after cleaning.

[0008]

[Means for Solving the Problems] In order to achieve the above object,
A container for chemical conversion of a tab terminal for an electrolytic capacitor of the present invention has 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 bottom of a bottomed cylindrical container made of a magnetically permeable material. It is drilled.

[0009]

In the present invention, since a large number of drainage holes are formed on the bottom surface of the cylindrical container, the cleaning liquid is quickly and completely discharged from the drainage holes on the bottom surface. Therefore, the time required for subsequent drying of the tab terminals can be greatly reduced, which contributes to the improvement of manufacturing efficiency. On the other hand, since the diameter of the drain hole is smaller than the thickness of the lead wire of the tab terminal, the lead wire does not pass through the drain hole, and there is no risk of the tab terminal falling off.

[0010]

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 of an embodiment of the present invention, in which a large number of drainage holes 5, 5, ... Are punched and punched in a flat bottom surface 4 of a cylindrical container 2 by press working. Aluminum, which is a magnetically permeable material, is used as the material of the cylindrical container 2.

The diameter of the drain holes 5, 5 ... Is smaller than the diameter of the lead wire 13 of the tab terminal 14 to be accommodated in the chemical conversion container 1. Specifically, the diameter of the lead wire 13 is 0.4.
In the case of mm, the hole diameter of the drain hole 5 is preferably about 0.3 mm.

The aluminum wire 1 is connected to the lead wire 13.
A large number of tab terminals 14 formed by welding 2 and forming a flat portion 11 on the aluminum wire 12 are inserted into the chemical conversion container 1 such that the lead wire 13 side contacts the bottom surface of the chemical conversion container 1, The aluminum wire 12 side is projected outside the container 1. It should be noted that vibration may be applied to the chemical conversion container 1 during this insertion.

The tab terminals 14 thus housed in the chemical conversion container 1 are washed as a pretreatment prior to the chemical conversion step. Here, the tab terminals 14 are washed by being passed through the cleaning liquid while being housed in the chemical conversion container 1. The tab terminal 14 after cleaning is subjected to a centrifugal separator together with the chemical conversion container 1 to remove the cleaning liquid, and is dried together with the chemical conversion container 1 in a dryer,
Move to the next chemical conversion process.

In the chemical conversion step, an electrode jig 21 having magnetism is arranged on the bottom surface of the chemical conversion container 1 as shown in FIG. 2, and the electrode jig 21 is connected to the anode of the power source 22. In this state, the lead wire 13 is surely attracted and held by the magnetic force of the electrode jig 21, does not drop even if it is upside down, and there is no risk of incomplete electrical contact or variation in holding force. 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 thus held in the chemical conversion container 1 is immersed in the chemical conversion liquid 24 in the chemical conversion tank 23. The power source 2 is used for the chemical liquid 24.
The cathode of No. 2 is connected, the power supply 22 is turned on, and the aluminum wire 12 of the part immersed in the chemical conversion liquid 24 is formed. At this time, since the height of the aluminum wire 12 is constant as described above, all the aluminum wires 12 are immersed in the chemical conversion liquid 24 to the same position, so that the chemical conversion film can always be formed to an accurate position, and thus the defective product Occurrence can be prevented. Reference numeral 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. After completion of the chemical conversion step, the tab terminals 14 are accommodated in the chemical conversion container 1 and washed by being passed through a cleaning solution of pure water as a post-treatment, and after cleaning, they are centrifuged and dried in the same manner as in the pre-treatment step. Let

As described above, in this embodiment, since a large number of drainage holes 5, 5 ... Are bored on the bottom surface 4 of the cylindrical container 2, the cleaning liquid is promptly discharged from the drainage holes 5, 5 ... And it is completely discharged. Therefore, the time required for subsequent drying of the tab terminals can be greatly reduced, which contributes to the improvement of manufacturing efficiency. On the other hand, since the drain holes 5, 5, ... Have a diameter smaller than the thickness of the lead wire 13 of the tab terminal 14, the lead wire 13
Does not pass through the drain hole 5, and there is no risk of the tab terminal 14 falling off.

Further, since the bottom surface 4 of the cylindrical container becomes rough due to the large number of drainage holes 5, the tip of the lead wire 13 can be prevented from slipping and the posture of the tab terminal 14 can be maintained.

Although the chemical conversion container 1 is entirely made of aluminum in the above-mentioned embodiments, the cylindrical container 2 is made of another metal such as a magnetically permeable material or a conductor containing a magnetically permeable material. It is also possible to use brass, copper, etc. However, if aluminum is used as in the above-mentioned embodiment, the chemical conversion container can be manufactured relatively inexpensively and is suitable for mass consumption, and since it has good malleability compared to other materials, it is easy to process and lightweight. The advantage is that

The drainage holes 5, 5 ... May be formed by drilling, or other means such as opening the bottom surface of the cylindrical container 2 and attaching a separately prepared net to the opening may be employed. However, in this embodiment, since punching and punching are performed by press working, there is no need to add any other member, there is an advantage that the manufacturing is simple and the cost is low.

Further, when punching out the drainage holes 5, 5 by pressing, it is better to punch out from the inside of the bottom face 4 toward the outside, so that an annular small piece (so-called burr) is formed at the edge of the drainage hole 5 with punching. Since it projects below the bottom surface 4, there is no drainage obstruction due to burrs.

Although the drain holes 5, 5, ... Are provided on the entire bottom surface 4 of the cylindrical container 2 in the present embodiment, they may be provided only on the peripheral portion of the bottom surface 4 or only on the central portion.

[0022]

As described above in detail, in the present invention, since a large number of drain holes are formed in the bottom surface of the cylindrical container, the cleaning liquid is quickly and completely discharged from the drain holes in the bottom surface. Therefore, the time required for the subsequent drying of the tab terminals can be greatly reduced, and the tab terminals can be efficiently cleaned and formed in the state of being housed in the container, and further cleaned.
It greatly contributes to the improvement of the efficiency of the whole manufacturing process. on the other hand,
Since the drainage hole has a diameter smaller than the thickness of the lead wire of the tab terminal, the lead wire does not pass through the drainage hole, and there is no possibility that the tab terminal will fall out.

Further, according to the present invention, since the bottom surface of the cylindrical container is rough due to the large number of drainage holes, there is an excellent effect that the tip of the lead wire can be prevented from slipping and the posture of the tab terminal can be maintained.

[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 process using the chemical conversion container of the embodiment of the present invention.

FIG. 3 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 Chemical conversion container 2 Cylindrical container 4 Bottom surface 5 Drain hole 13 Lead wire 14 Tab terminal

Claims (1)

[Claims] A container for chemical conversion of a tab terminal for an electrolytic capacitor, 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 on the bottom surface of a bottomed cylindrical container made of a magnetically permeable material. .