JPH02303689A - Method for joining contact point material - Google Patents

Abstract

PURPOSE:To obtain a contact point with high reliability having few defects such as a void and incomplete penetration by holding temporarily a contact point material and a metal plate while rubbing these mechanically and then, heating and welding these. CONSTITUTION:A recession 1a is formed on the joining face of the contact point material 1 and the metal plate 2 is subjected to plastic deformation by drawing, etc., via a jig 4. The metal plate 2 is held temporarily on the recession 1a of the contact point material 1 and pressed in the recession 1a while being rubbed mechanically and stuck to each other. The joining part is then irradiated with a high energy beam such as a laser beam or an electron beam or subjected to resistance heating, etc., and molten and joined together. By this method, at the time of subsequent heat treatment, diffusion reaction of atoms easily takes place even if an activator such as flux is not used and stable joining is obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for bonding contact materials, particularly for bonding contact materials with good conductivity to thin metal plates, which are used in relays, switches, etc., and are used in relays, switches, etc. Regarding how to.

(Prior Art) As a means for joining contacts such as relays, microsinches, breakers, etc. to a substrate by laser welding or the like, a technique described, for example, in Japanese Patent Publication No. 62-40119 is known. According to this prior art, as shown in FIG. 6, the contact material 1° and the base metal plate 2' are overlapped,
A method is adopted in which welding is performed by irradiating laser a from the side of the base material.

(Issues to be Solved by the Invention However, according to the conventional welding means described above, it is necessary to bring the overlapped portion of the contact material and the base material into close contact by 1°.

Otherwise, the amount of penetration during welding becomes unstable, defects such as voids are likely to occur, and reliability as a contact point decreases.

On the other hand, even when a low melting point metal such as a brazing filler metal or solder is sandwiched between the contact material 1° and the base material and melted and bonded, an activator such as flux is used to clean the joint surface and promote wettability of the molten metal. This required problems such as flux adhesion to the contact surface.

This invention was made to solve the above problems,
The objective is to provide a method for joining contact materials that can provide a highly reliable joining interface.

(Means for Solving the Problems) In the present invention, the above object is achieved by temporarily holding the contact and the metal plate while mechanically rubbing them, and then heat welding them.

In addition, a concave or convex portion is formed on the joint surface of the contact, and gold 12
The above objective is achieved by plastically deforming i11vi, temporarily holding it, and then heat welding it.

Further, the above object is achieved by forming holes or irregularities in a metal plate, press-fitting contacts into the metal plate, temporarily holding them, and then heat welding them.

(Function) With the above structure, dirt from the oxide film on the surface can be removed during the temporary holding process without using any activator, and since the contact material and the metal plate are brought into close contact with each other by press-fitting, both members can be reliably joined.

(Example 1) Figure 1 (→, (b) shows a first example of the present invention. In this example, a recess 1a is formed in the joint surface of the contact material 1, and a metal plate 2 is The material is plastically deformed by drawing through a jig 4, and as shown in the figure, it is temporarily held in the recess 1a of the contact material 1 and press-fitted into the recess 1a while mechanically rubbing it to make a tight fit. I'm letting you do it. Then, the joining portion is irradiated with a high-energy beam such as a laser or an electron beam, or resistance heating or the like is performed (not shown) to melt and join.

In addition, when drawing the metal plate 2 in the above process, the dirt of the oxide film on that part is removed, and the clean sheared surface without the oxide film is rubbed and brought into close contact with the recess 1a of the contact material 1, and at that time, the contact The concave surface of the recess 1a of the material 1 is also cleaned by removing the oxide film dirt.

Therefore, the atomic diffusion reaction can easily occur without using an activator such as flux during the subsequent heat treatment, and stable bonding can be obtained.

(Embodiment 2) FIGS. 2(a) and 2(b) show a second embodiment of the present invention. In this example, the metal plate 2 in the first embodiment described above is
Instead of the drawing process, the contact material 1 having the recess 1a is punched out from the other side of the metal plate 2 on one side using the jig 3, and the protrusion 2a is inserted into the recess 1a. It is unique in that it is temporarily held inside. It should be noted that heat treatment is performed in order to perform melt bonding.

(Embodiment 3) FIGS. 3(a) and 3(a) show a third embodiment of the present invention. In this embodiment, the metal plate 2 is also provided in the recess 1a formed in the contact material 1 from the beginning. A press-fittable protrusion 2a is formed by an appropriate means, and the protrusion 2a is press-fitted into the recess 1a of the contact material 1 and temporarily held. In this embodiment as well, the oxide film can be removed during punching and press-fitting when forming the convex portions 2a, and the effect of clean surfaces coming into close contact with each other can be obtained.

As described above, the configurations of the first to third embodiments are such that the contacts and the metal plate are temporarily held while being mechanically rubbed, and then heated and welded.

Further, a recess is formed in the joint surface of the contact, and the metal plate is temporarily held by being plastically deformed through the recess, and then heated and welded.

Note that it is also possible to temporarily hold the contact material 1 by forming protrusions on the joint surface and forming recesses on the metal plate 2 side.

(Embodiment 4) FIGS. 4(a) to 4(C) show process diagrams of a fourth embodiment of the present invention. In this embodiment, a hole 2b is formed in the metal plate 2, and a wire-shaped contact is inserted into the hole 2b. 1 is press-fitted and cut to temporarily hold it.

(Embodiment 5) FIGS. 5(a) and 5(b) show a fifth embodiment of the present invention. In this embodiment, an uneven portion 2c is formed in the metal plate 2 instead of a hole. The contact material 1 is pressed and temporarily held.

In these embodiments as well, the effect of cleaning the surfaces during the press-fitting and crimping process can be expected.

In addition, in each of the above embodiments, contact material 1 and metal Fi2
Of course, a metal foil with a low melting point may be interposed between the two for temporary holding.

(Effects of the Invention) As described above, according to the present invention, the contact material and the metal plate are temporarily held by mechanically rubbing the contact material and the metal plate, and the metal plate is held by forming recesses or protrusions on the bonding surface of the contact material. The joint surface can be temporarily held by plastic deformation and temporary holding at that part, or by forming holes or irregularities in the metal plate, press-fitting the contact material into the metal plate and temporarily holding it, and then heating and welding it. Highly reliable contacts with few defects such as voids and poor weld penetration can be cleaned during the process, and the joints can be reliably joined, and highly reliable contacts with few defects such as voids and poor penetration. It has the effect of obtaining

[Brief explanation of the drawing]

Figure 1 (barrel), (b) is a process diagram of the first embodiment of the present invention, Figure 2 (a) 2Φ) is the second embodiment of the present invention, Figure 3 (a)
. (b) shows the third embodiment of the present invention, FIG. 4 (al to (C) shows the fourth embodiment of the present invention, and FIG. For example, FIG. 6 is a conventional example. DESCRIPTION OF SYMBOLS 1...Contact material, 1a...Recess, 2...Metal plate Fig. 1 (a) (b) Fig. 2 (a) (b) Fig. 3 (a) (b) 2a 2a No. Figure 4 (a) (b) (c) Figure 5 Figure 6

Claims (3)

[Claims] (1) A method of joining contact materials by temporarily holding the contact material and a metal plate while mechanically rubbing them, and then heat welding them. (2) A method for joining contact materials by forming recesses or projections on the joint surfaces of the contact materials, plastically deforming the metal plate, temporarily holding the metal plate in the portions, and then heat welding the metal plates. (3) A method for joining contact materials by forming holes or irregularities in a metal plate, press-fitting the contact material into the metal plate, temporarily holding it, and then heat welding it.