JPH08111355A - Production of electrode terminal for electrolytic capacitor - Google Patents

Abstract

PURPOSE: To realize an efficient production by passing an aluminum rod, at a rate within a predetermined range, through a heater tube at a temperature within a predetermined range, annealing the aluminum rod and then electrically welding a lead wire to one end of the aluminum rod thereby eliminating defective welding. CONSTITUTION: An aluminum rod 1 is pressed, at one end thereof, to form a flat part 2 and then the aluminum rod 1 is passed at a rate of 15-20mm/sec, by means of a shooter at an air transfer section 7, through a heater tube 5 heated at 450-5O deg.C by means of a heater 6 in a heating unit 8 thus annealing the aluminum rod 1. Subsequently, a lead wire 3 is electrically welded, at a welding section 4, to one end of the aluminum rod 1 thus forming an electrode terminal 10 for electrolytic capacitor. This structure eliminates defective welding and realizes an efficient production with enhanced workability.

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 electrode terminals used in electrolytic capacitors.

[0002]

2. Description of the Related Art Electrode terminals for conventional electrolytic capacitors are
It is used by pressing the end using aluminum rod etc. to make a flat part, welding the lead wire to the other end and then performing chemical conversion treatment to form an oxide film on the flat part. The capacitor element was welded to form an electrolytic capacitor. Then, this electrode terminal is formed by cutting an aluminum rod having a circular cross section into a certain size and then welding a CP wire as a lead wire to one end and leaving the circular cross section to press the other end to form a flat portion and a peripheral portion. The manufacturing method of cutting and shaping is adopted.

[0003]

In this conventional method, when the Al wire of the aluminum rod and the CP wire of the lead wire are electrically welded, the shape and strength of the weld are varied and unstable. This is because the Al wire of an aluminum rod is drawn by a wire rod manufacturer through a die in order to obtain a uniform wire diameter, so it becomes an Al wire rod containing work hardening or metal strain, and the structure in the wire rod becomes unstable. If the lead wire is welded as it is, the welding shape and strength will not be stable, resulting in defective quality, the surface of the weld will be rough, and the amount of welding can be increased during welding. However, there are problems that the work is complicated and the operation rate and the yield are reduced, and the production cost is also high. The present invention is intended to eliminate these conventional drawbacks, and provides an economical method for producing an electrode terminal for an electrolytic capacitor, which can efficiently produce a defective product at a welded portion and can greatly improve workability. That is the purpose.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing an electrode terminal in which a flat portion is provided at one end of an aluminum rod having a predetermined length and a lead wire is provided at the other end by electric welding. An aluminum rod is passed through a heater tube at 450 to 500 ° C. at a speed of 15 to 20 mm / sec for annealing, and then a lead wire is electrically welded to one end of the aluminum rod. It is a manufacturing method.

[0005]

In order to electrically weld a lead wire to the other end of an aluminum rod which is pressed at one end to form a flat portion, the aluminum rod is placed in a heater tube at 450 to 500 ° C at a speed of 15 to 20 mm / sec. After that, the aluminum rod is annealed, and then a lead wire is electrically welded to one end of the aluminum rod material, whereby an aluminum electrode terminal with a lead wire can be efficiently produced, and there is no material loss, and the operating rate and the yield can be significantly improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. One end of an aluminum rod 1 such as an Al wire is pressed to have a flat portion 2 and the other end is electrically connected to a lead wire 3. In order to form an electrode terminal which is connected by welding, the aluminum rod 1 is heated in the heater tube 5 at 450 to 500 ° C. in the heater tube 5 in the air transfer portion 7 through the shooter at a speed of 15 to 20 mm / After being passed for sec and annealed, a lead wire 3, for example, a CP wire is electrically welded to one end of the aluminum rod 1 at a welded portion 4 to form an electrode terminal 10 for an electrolytic capacitor.
There is.

As the aluminum rod 1, an aluminum wire having a circular cross section is cut into a predetermined length, and one end or a central portion thereof is rolled to a thickness which becomes the flat portion 2 of the electrode terminal 1 and an ear portion is required. Aluminum tabs are cut with various widths. In this case, in the rolling step, the aluminum bar 1 is pressed from both upper and lower sides and rolled in both sides, and it is preferable to leave one end or both ends as it is to utilize it as an electrode lead part as it is. Accordingly, the flat portion 2 may be pressed from one side so that the flat portion 2 is displaced to one of both end portions to form a continuous electrode terminal.

Further, rolling without leaving both ends of the aluminum rod 1 and leaving only one end thereof can be carried out depending on the size of the aluminum wire rod, and if necessary, there is a separating wire (V groove). It is also possible to roll the central part so that both ends are substantially left.

Such an aluminum rod 1 is annealed by passing it through a heater tube 5 at 450 to 500 ° C. in a heating device 8 at a speed of 15 to 20 mm per second to make up the constituent atoms of the metal structure of the aluminum rod. Easy to move, return to a soft state to eliminate work hardening and metal strain, promote recrystallization of aluminum metal, and increase electric resistance to high purity.
It can be made to be about the same as 9.99, the amount of heat of arc generation at the time of welding the lead wire 3 can be suppressed, the surface of the welded portion 4 can be smoothed, and its shape can be stabilized, and the amount of hammering at the time of welding Can be increased by about 25% under the same conditions. In addition, if the temperature of the heater tube 5 is lower than 450 ° C.,
If the annealing action is insufficient, and if it exceeds 500 ° C, not only does it hinder the recrystallization of the aluminum metal structure,
It should be avoided because it will be expensive in terms of equipment, and if the passing speed is out of the above range, workability and equipment problems will occur, so it should not be adopted.

Then, the aluminum bar 1 is fitted and placed on a feed plate with a chuck or a chain on the conveyor 9 and conveyed, and after passing through the positioning 12, the CP
After welding the lead wire 3 of the wire at the butt welding portion 13,
Each of the lead wires 3 and 3 is cut by a cutting portion 18 at a predetermined length position and further transferred to the next step.
It should be noted that a conveyor 9 for placing and transporting the aluminum rods 1 having the flat portions 2 at intervals, a lead wire supply mechanism 30 for abutting the lead wires 3, and a lead wire welding portion for the lead wire supply mechanism. 13 and a lead wire cutting unit 18, a linear machine 31, and a lead wire feeding mechanism 32,
It is advisable to carry out integrated production by using equipment equipped with an unloading mechanism for inserting and holding one of the welded lead wires 3 and unloading. The welded portion 13 is equipped with a welding lever chuck and a reciprocating mechanism, and the lead wire cutting mechanism 30 is reciprocated so that the lead wire length can be appropriately selected and cut. It is better to select and apply the one that has.

The lead wire welding step may be carried out before the primary cutting step or after the secondary cutting step in addition to after the primary cutting step. By forming it, it is also considered that the work of the cutting process is facilitated. Further, instead of separately performing the primary cutting step and the secondary cutting step, it is possible to arbitrarily select a processing method in which both cutting steps are performed at the same time because of the cutting device.

[0012]

According to the present invention, when a lead wire is welded to an aluminum rod, the aluminum rod is heated to 450 to 500 ° C.
After passing through the heater tube at a speed of 15 to 20 mm / sec for annealing and then electrically welding a lead wire to one end of the aluminum rod, the surface of the welded portion of the lead wire becomes smooth, and the shape and strength are improved. Can be stabilized, the electric resistance value of the aluminum tab can be greatly increased, and the amount of driving at the time of welding can be increased, which is effective in terms of strength. As a result, there is no defective product as an electrode terminal, efficient production is possible, and it is suitable for mass production, and the operating rate and yield can be greatly improved, and the productivity is significantly improved. can do.

[Brief description of drawings]

FIG. 1 is a system explanatory view of a material manufacturing process according to an embodiment of the present invention.

FIG. 2 is a perspective view of a commercialized electrode terminal.

[Explanation of symbols]

 1 Aluminum Rod 2 Flat 3 Lead 4 Weld 5 Heater Pipe 6 Heater 7 Transfer 8 Heating 9 Conveyor 10 Electrolytic Capacitor Electrode Terminal 12 Positioning 13 Weld 18 Cut 30 Lead Wire Supply Mechanism

Claims (1)

[Claims] 1. A method of manufacturing an electrode terminal, comprising a flat portion at one end of an aluminum rod having a predetermined length, and a lead wire being electrically welded at the other end, wherein the aluminum rod is 450 to 500 ° C. 15 ~ 20mm speed in the heater tube
The method for producing an electrode terminal for an electrolytic capacitor is characterized in that a lead wire is electrically welded to one end of the aluminum rod after being annealed by passing the aluminum alloy at a rate of / sec.