JPS60138811A - Method of producing electric contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electric contact, and more particularly to an improvement in a method for manufacturing an electric contact in which a contact material is resistance welded to a base material.

Conventionally, in order to make an electric contact by resistance welding a contact material to a composite material, it is usually done as shown in Fig. 1a and b (a projection 2 is provided at the center of the welding surface of the contact material 1, Projection welding is performed on material 3.

However, the method for manufacturing such an electric contact requires the following: the dimensions of the projection welding contact material 1 and the stand jtA3.

4A The current, voltage, electrode pressing force, etc. are kept constant depending on the quality, but in actual projection welding, even a slight dimensional error in the protrusion 2 of the contact material 1 may cause the contact material 1 to melt too much. Welding strength decreased due to protrusion of contact material around the contact material and insufficient welding of contact material 1, and contact material 1
If the projection welding contact material 1 is not set horizontally on the base material 2, the projection welding contact material 1 will rest on the base material 2, and the welding current will also flow from here, so the contact material I will be welded to the base material 2 at around 1. It will eventually become unusable.

The present invention has been developed in view of the above circumstances, and it is possible to properly weld the contact material without over-melting or under-penetrating the contact material, and also stably welding without tilting the contact point. Therefore, it is an object of the present invention to provide a manufacturing method capable of obtaining electrical contacts of good quality.

As shown in FIG. 2a, the method for manufacturing an electric contact of the present invention is as follows: As shown in FIG. 2. As shown in Figure 2, this is characterized by resistance welding to the base material 3.

In the method of manufacturing an electric contact of the present invention, the contact 'tJ
The reason why the flat welding surface of 1 is resistance welded to the base material 3 via the contact point +A1 and the material 4 whose resistivity value is larger than that of the base material 3 is that the Joule heat during resistance welding is increased, and the contact point v
This is because the welding is performed by melting and joining the two at an optimal position between the two without biasing toward the i or the base material 3 side.

Next, in order to clarify the effects of the method of manufacturing an electric contact of the present invention, specific examples and conventional examples will be described.

〔Example〕

As shown in Figure 2a, the width is 2m1. The contact material 1 and the thickness Q,
Coated with copper oxide 4 having a resistivity value larger than that of the base material 3 made of phosphor bronze with a width of 5 mm, a width of 5+++, and a length of 15 mm, the thickness of the copper oxide 4 is 0.0, of as thick as that of the base material 3 by spackling.
As shown in Figure 2, electrical contact is made by resistance welding to the base material 3≠5.
(7)

(Conventional example) As shown in Figure 1a, <Il'fi 2mm, height 1.2m
m, radius of curvature 1im, length 3ml+ semicylindrical Ag
A semicircular protrusion 2 with a radius of 0.2 mm is provided at the center of the welding surface of the contact material 1, and the protrusion 2 has a thickness of 0.5 mm, 1 width of 5 mm, and a length of 15 mm, as shown in Figure 1. An electric contact 5' was obtained by projection welding to a base material 3 made of dragon phosphor bronze.

However, each of the electrical contacts of these embodiments and the conventional example was 1000
When we inspected the quality of each piece, we found 97 defective products in the conventional electrical contact 5', where the contact material 1 melted too much and protruded to the surrounding area, or the contact material 1 was hit and welded to the base material 3. On the other hand, there were no such defective products in the electrical contact 5 of the example.

Furthermore, when the welding strength of the contact material 1 was measured for each of 10 electrical contacts of the above example and conventional example, the results shown in the table below were obtained.

As is clear from the above table, the welding strength of the contact material 1 in the electrical contact 5 of the example is significantly higher than that of the contact material 1 in the conventional electrical contact 5', and there is less variation. It turns out that it is small and stable.

In addition, in the manufacturing method of the electric contact 5 of the second embodiment, Ag is used for the contact material 1, and phosphor bronze is used for the contact material 3.
The contact material 1 is not limited to this, but the contact material 1 may be Ag alloy, Au,
Noble metals such as Au alloy, PT, PT gold alloy, and alloys thereof may be used, and the base material 3 may be made of nickel silver or other materials. The material 4 with a large specific resistance value interposed between the contact material 1 and the base material 3 is
1 and the materials of the base material 3 are appropriately selected.

In that case, an oxide of the same type as the base material 3 is preferable. The material 4 having a high specific resistance value is not limited to a single layer, but may be a multilayer, and its thickness is 0.1 to 10.
0 μm is preferable. Of course, even if the thickness is 100 μm or more, there is no problem with separate installation.

As detailed above, the method for manufacturing an electric contact of the present invention involves resistance welding to a composite material with a thin material having a higher specific resistance value than the contact material and base material interposed on the flat welding surface of the contact material. Therefore, a large amount of Joule heat can be generated during welding, and the welding can be performed by melting at the optimum position between the contact point +AI and the base material 3. Therefore, it is possible to properly weld the contact material without over-melting or insufficient penetration, and it is possible to weld stably without tilting the contact material, resulting in good quality and high welding strength, so there is no variation. This has the excellent effect of making it possible to obtain a stable electrical contact with less irradiation.

[Brief explanation of the drawing]

1A and 1B are diagrams showing a conventional method of manufacturing an electric contact by projection welding, and FIGS. 2 and 35B are diagrams showing a method of manufacturing an electric contact according to the present invention. 1---One contact material, 3---One base material, 4 Material with high specific resistance value. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 (b) R'

Claims (1)

[Claims] When manufacturing an electrical contact by welding a contact material to a composite material, a thin material having a resistivity value higher than that of the contact material and the composite material is interposed between the flat welding surface of the contact material and the composite material. A method of manufacturing an electric contact, characterized by resistance welding it to a base material.