JP2000228336A - Lead wire welder for electronic component and welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the welding yield of an electronic component, such as a metallized film capacitor. SOLUTION: A lead wire welder for an electrical component comprises a holder 16, an axis 18 which is rotatably supported by the holder 16, and two welding electrodes 11 and 12 which are fixed on the axis 18 and are respectively made of different materials. Upon welding, the electrodes 11 and 12 are pressed to lead wires 14, which are put on electrodes 15 of a component element 13. To improve the service life of the welding electrodes, the electrode 11 is made of tungsten, and the other welding electrode 12 is made of copper tungsten. Also, by making the two welding electrode 11 and 12 formed into disks, and a welding position changed according to the arbitrary number of weldings, the service life of the welding electrodes can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead wire welding machine and a welding method for electronic parts used in electronic equipment, metallized film capacitors used in electric equipment, and the like.

[0002]

2. Description of the Related Art Conventionally, when a lead wire is welded to a capacitor element in a metallized film capacitor, FIG.
This was performed as shown in FIG.

The conventional welding method as described above will be described below with reference to the drawings. FIG. 4 schematically shows a case where a lead wire is welded to a capacitor element, and FIG.
FIG. In the figure, 1 is a negative rectangular electrode of tungsten material, 2 is a positive rectangular electrode of tungsten material, 3 is a capacitor element, 4 is a lead wire, and 5 is a capacitor element 3.
Reference numeral 6 denotes a welding electrode holder, and reference numeral 7 denotes a weldable position at the tip of the rectangular electrodes 1 and 2. 8 is a current flowing through the electrode.

First, the lead wire 4 is restricted to the center position of the electrode portion 5 of the fixed capacitor element 3, and the rectangular electrodes 1 and 2, which are fixed to the holder 6 and pressurized thereon, are pressed from above. In this method, an electric current is applied to generate Joule heat at the tip of the electrode, and the lead wire 4 and the electrode portion 5 are welded.

[0005]

However, in such a welding method, the material of each of the rectangular electrodes 1 and 2 as a pair of welding electrodes is the same tungsten material, and the electrode ends of the rectangular electrode 1 Since the generated heat is transmitted through the lead wire 4 and escapes, the heat generated at the electrode tip of the square electrode 1 is small and non-uniform. Therefore, when the lead wire 4 and the electrode portion 5 of the capacitor element 3 are welded, the degree of welding at the electrode tip of the square electrode 1 becomes small, the welding strength becomes unstable, and the cause of insufficient strength failure and no welding failure. It has become. Further, at this time, if the current is further increased in order to increase the welding strength of the electrodes, the tips of the rectangular electrodes 1 and 2 are quickly worn, which also causes a short life.

The present invention has been made in order to solve the above-mentioned problems.

[0007]

According to the present invention, there is provided a lead wire welding machine for an electronic component, which solves the above problems.
And a shaft 18 rotatably supported by the holder 16.
And two welding electrodes 11 and 12 fixed to the shaft 18 and each made of a different material and pressed against a lead wire 14 applied to the electrode portion 15 of the component element 13 during welding. I have.

In order to improve the life of the welding electrode, 2
It is preferable that one of the welding electrodes 11 and 12 is made of tungsten, and the other welding electrode 12 is made of copper tungsten. Even if the two welding electrodes 11 and 12 are formed in a disk shape and the welding position can be changed every arbitrary number of weldings, the life of the welding electrodes can be extended. Specifically, by further comprising a gear 19 fixed to the shaft 18 and provided with a plurality of grooves 19a, and a ball 21 constantly pressed against the gear 19 by a spring 20 and engaged with the groove 19a. Since the welding position can be changed every arbitrary number of times of welding, the life of the welding electrode can be extended.

According to the lead wire welding method for an electronic component according to the present invention, the lead wire 14 is applied to the electrode portion 15 of the component element 13 and then two welding electrodes made of different materials are used. Electrode part 1
5 and press the welding electrode 11.
2, heat is generated at the tip of the electrode portion 15 to connect the lead wire 14 to the electrode portion 15.
To be welded.

In order to improve the life of the welding electrode, 2
It is preferable that one of the welding electrodes 11 and 12 is made of tungsten, and the other welding electrode 12 is made of copper tungsten. Also,
Even if the two welding electrodes 11 and 12 are formed in a disk shape and the welding position is changed every arbitrary number of times of welding, the life of the welding electrodes can be extended.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the present invention will be described.
This will be described with reference to FIGS.

FIG. 1 shows an outline of resistance welding of a lead wire to a capacitor element of a metallized film capacitor.
FIG. 2 is a plan view of FIG. In the figure, reference numeral 11 denotes a disc-shaped circular round electrode made of tungsten, 12 denotes a disc-shaped circular round electrode made of copper tungsten, 13 denotes a capacitor element of a metallized film capacitor, 14 denotes a lead wire, Fifteen
Is an electrode part of the capacitor element 13, 16 is a holder for the welding electrode, and 17 is a current flowing through the electrode.

First, the lead wire 14 is restricted to the center position of the electrode portion 15 of the fixed capacitor element 13, and the lead wire 14 is fixed to the holder 16 from above, and the two round electrodes 11, 12 under pressure are applied. A part of the peripheral surface is pressed to cause a large current to flow to generate Joule heat at the tip of the electrode, thereby welding the lead wire 14 and the electrode portion 15.

FIG. 3 is a plan view of FIG. 2 viewed from the lateral direction. In the figure, round electrodes 11 and 12 are attached to holder 1.
6, a gear 19 having a plurality of grooves 19a formed on its outer peripheral surface.
Has been fixed. A ball 21 which is constantly pressed toward the gear 19 by a spring 20 is engaged with the groove 19 a of the gear 19.
By rotating the gear 19 against the engaging force of the round electrode 11, the round electrodes 11 and 12 rotate, and the welding position of the lead wire 14 of the round electrodes 11 and 12 is changed every time the welding is performed an arbitrary number of times. Can be changed. That is, the shape of the welding electrode is changed to a disk shape, and, for example, the range usable for welding can be used at 36 places on the outer peripheral surface of the round electrode, so that one welding position is worn out and becomes unusable. When it is possible, by rotating every 10 ° and welding at a new position, the life can be extended 36 times.

In Table 1, the material of the round electrode 11 on the negative side is fixed, and the round electrode 12 on the positive side is changed to one having a high conductivity (low specific resistance) to fix the welding power value. The welding strength, the weld defect rate, and the electrode life at the time of comparison are shown.

[0016]

[Table 1]

As can be seen from Table 1, the welding performed according to Examples 1 to 4 of the present invention has an improved welding strength and an improved defective weld ratio compared to the prior art. Further, by setting the material of the welding electrode to tungsten for one side and copper tungsten for the other side, the life of the welding electrode can be improved.

In the above description, a metallized film capacitor has been described as an example. However, the present invention can be applied to other electronic components as long as they have a structure in which a lead wire is welded to a component element. it can.

[0019]

As described above, according to the present invention, the welding strength can be improved by using different materials for the pair of welding electrodes. Further, by setting the material of the welding electrode to tungsten for one side and copper tungsten for the other side, the life of the welding electrode can be improved. Further, by changing the shape of the welding electrode to a disk shape and, for example, making the range usable for welding to be able to use 36 places on the outer peripheral surface of the round electrode, the life can be extended 36 times. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a welding method according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a perspective view schematically showing a conventional welding method.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 11, 12 Round electrode 13 Capacitor element 14 Lead wire 15 Electrode part 16 Holder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Eiji Nishikori, Inventor 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] A holder (16), and a shaft (1) rotatably supported by the holder (16).
8) and fixed to the shaft (18), each of which is made of a different material.
5) A lead wire welding machine for electronic parts, comprising: two welding electrodes (11, 12) pressed against a lead wire (14) applied to the lead wire. 2. The two welding electrodes (11, 12), wherein one of the welding electrodes (11) is made of tungsten, and the other welding electrode (12) is made of copper tungsten. 2. A lead wire welding machine for electronic components according to claim 1. 3. The electronic device according to claim 1, wherein the two welding electrodes are disk-shaped and the welding position can be changed every arbitrary number of weldings. Parts lead wire welding machine. 4. A gear (19) fixed to the shaft (18) and provided with a plurality of grooves (19a), and is constantly pressed against the gear (19) by a spring (20). The electronic component lead wire welding machine according to claim 3, further comprising a ball (21) that engages with the electronic component. 5. A lead wire (14) is applied to an electrode part (15) of a component element (13), and the peripheral surfaces of two welding electrodes (11 and 12) each made of a different material are applied to the electrodes. A method of welding a lead wire of an electronic component, wherein heat is generated at the tips of welding electrodes (11 and 12) by applying a current by pressing against the portion (15) to weld the lead wire (14) to the electrode portion (15). . 6. The two welding electrodes (11, 12), wherein one of the welding electrodes (11) is made of tungsten and the other welding electrode (12) is made of copper tungsten. 6. The lead wire welding method for an electronic component according to 5. 7. The welding position is changed every arbitrary number of weldings, wherein the two welding electrodes (11, 12) are disk-shaped.
The lead wire welding method for an electronic component according to claim 5.