JPS6046768B2 - Method of manufacturing electrical contacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing two-layer or multi-layer electrical contacts.

Conventionally, noble metals with excellent contact performance have been used for electrical contacts, but because precious metals are extremely expensive and to improve weldability, electrical contacts made of two or more layers of base metals have been used. It is used.

By the way, in order to manufacture such an electrical contact, first prepare an electrical contact material 1 made of two or more layers of tension material as shown in FIG. The electric contact 2 as shown in FIG. 2 was punched out during processing, or it was further molded to form an electric contact 2' having a projection 2a on the lower surface of the contact as shown in FIG.

However, in this method of manufacturing electrical contacts, since the electrical contact material 1 with two or more layers is made by laminating a noble metal plate and a base metal plate, it is punched out by press processing and then made from scrap material. The disadvantages are that it is necessary to recover extremely expensive precious metals, that recovery requires expensive equipment, and that recovery work requires a lot of labor and time. The present invention has been made in order to eliminate such drawbacks, and its purpose is to provide a method for manufacturing two-layer or more multi-layer electrical contacts that does not generate precious metal scraps, that is, does not require precious metal recovery operations. be.

The method for manufacturing an electrical contact according to the present invention is characterized in that a noble metal piece of a desired shape is joined onto a base metal plate consisting of at least one layer, and then the base metal plate is punched out along the shape of the noble metal piece using a press. That is.

Embodiments of the present invention will be described below with reference to the drawings.

In the production of an electrical contact consisting of three layers, the lower part is an iron-nickel alloy, the middle part is copper, and the upper part, i.e., the contact surface part, is silver, the present invention uses iron-nickel alloy made by hot pressure welding as shown in Fig. 4. On top of base metal upholstery 5 consisting of alloy plate 3 and copper plate 4,
As shown in FIG. 5, circular silver contact pieces 6 are joined by brazing, and then the tension material 5 is punched out using a press along the shape of the contact pieces 6 to form a Ξ layer as shown in FIG. The electric contact 2 or the electric contact 2' is further finished and molded to form a three-layer electric contact 2' having a projection 2a on the lower surface of the contact as shown in FIG.

In the electrical contact of the above example, the reason why the iron-nickel alloy is arranged in three layers, with the iron-nickel alloy in the lower part and the copper in the middle part, is that the iron-nickel alloy improves the resistance weldability to the base material. This is because copper is effective and reduces the material cost of the contact metal. In the above example, a method for manufacturing an electrical contact in which a base metal is arranged in the lower part and the middle part and a noble metal in the upper part, that is, the surface part of the contact is explained. can also be manufactured by a similar method.

That is, by bonding two layers of pre-bonded precious metal contact pieces of a desired shape onto a base metal plate, and then punching out the base metal plate with a press along the shape of the contact pieces, three layers of electrical contact pieces are formed. A point of contact is made.

In addition, in the above embodiment, the base metal upholstery consisting of two layers is
Brazing is used to join contact pieces made of precious metals, but the method is not limited to this; resistance welding, voltage welding, hot pressure welding, etc. may also be used. .

Furthermore, finishing molding as shown in FIG. 3 is carried out as appropriate.

As detailed above, according to the method for manufacturing electrical contacts of the present invention, no scrap is generated in the precious metal contact pieces, so there is no need for troublesome precious metal recovery work, and there is no need for expensive precious metal recovery equipment. Moreover, it has excellent effects such as simplifying production management for manufacturing electrical contacts.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional electrical contact material made by bonding a noble metal plate to a base metal plate, Figure 2 is a perspective view of an electric contact, and Figure 3 is obtained by further molding the contact shown in Figure 2. 4 is a front view of the electrical contact, FIG. 4 is a perspective view of a two-layer base metal plate, and FIG. 5 is a perspective view showing a state in which a noble metal contact piece is bonded to the base metal plate of FIG. 4. 1... Electrical contact material, 2,2''... Electrical contact, 2a00''.

Claims (1)

[Claims] 1. A method for manufacturing an electrical contact, which comprises bonding a piece of noble metal onto a base metal plate consisting of at least one layer, and then punching out the base metal plate along the shape of the noble metal piece using a press.