JPH04368723A - Manufacture of electric contact point - 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]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing electrical contacts, and more particularly to an improvement in the method for manufacturing electrical contacts in which a contact material is caulked flush with a base material.

0002

[Prior Art] Conventionally, in order to make an electrical contact in which a contact material is caulked flush with a base material, as shown in FIG. Tapers 3 and 4 are attached to the upper and lower peripheral edges of 2 as shown in FIG. 6, and then the contact material 5 is penetrated into the contact material mounting hole 2 as shown in FIG. It is crushed from both sides and caulked into tapers 3 and 4 flush with both the upper and lower surfaces of the base material 1, as shown in FIG.

By the way, in the electrical contact made in this manner, the contact material 5 is only caulked at the tapers 3 and 4 at the upper and lower peripheral edges of the contact material mounting hole 2, so the caulking strength is weak. It was unstable. Therefore, taper 3
, 4 may be increased to increase the caulking strength of the contact material, but if the tapers 3 and 4 are increased, the base material 1 will deform and defective products will occur.

0004

[Problems to be Solved by the Invention] Therefore, the present invention provides a method for manufacturing an electrical contact that can increase and stabilize the caulking strength of the contact material without increasing the taper of the upper and lower peripheral edges of the contact material mounting hole of the base material. This is what we are trying to provide.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the method for manufacturing an electrical contact of the present invention is to make a contact material mounting hole in a base material, and then to form a contact material mounting hole on the upper and lower peripheral edges of the contact material mounting hole. Taper processing is performed inward to a depth of 1/10 to 1/4 of the board thickness of the base material, and ring-shaped protrusions are provided above and below the inner circumferential surface of the contact material mounting hole, and a ring-shaped convex part is provided between the holes. Next, the contact material is passed through the contact material mounting hole, and then the upper and lower sides of the contact material are crushed to form a taper at both the upper and lower ends of the contact material mounting hole so that it is flush with both the upper and lower surfaces of the base material. It is characterized by being caulked into a recessed portion in the middle of the inner circumferential surface.

In the method for manufacturing an electrical contact of the present invention, the depth of the taper process applied to the upper and lower peripheral edges of the contact material mounting hole of the base material is set to 1/10 to 1/4 of the thickness of the base material. The reason is that if it is less than 1/10, it is difficult to form a ring-shaped protrusion at the lower end of the taper, and therefore the recess necessary for caulking will not be formed, and if it exceeds 1/4, a ring-shaped protrusion will be formed, but This is because the ring-shaped protrusions come together and there is no recess necessary for caulking.

[0007]

[Function] As mentioned above, the method for manufacturing an electrical contact of the present invention is as follows:
The upper and lower ends of the contact material mounting hole of the base material are tapered, and a ring-shaped convex part is provided at the inner end of both tapers, and a ring-shaped concave part is formed between the ring-shaped convex parts. When the contact material is passed through the contact material mounting hole and the top and bottom sides are crushed, the middle part of the contact material swells, fills the ring-shaped recess, and is caulked, and the top and bottom ends taper flush with both the top and bottom surfaces of the base material. It is caulked and the caulking becomes strong and stable.

[0008]

[Example] An example of the method of manufacturing an electrical contact of the present invention will be explained with reference to the drawings.
A contact material mounting hole 2 with an inner diameter of 2 mm is drilled at the tip of a base material 1 made of phosphor bronze having a diameter of 2 mm, and then a contact material mounting hole 2 is formed at the upper and lower peripheries of the contact material mounting hole 2 toward the inside of the hole 2 as shown in FIG. Tapers 3', 4' with a depth of 0.1 mm and an inclination angle of 30 degrees are attached by punch forming, and a height of 0. .15 mm ring convex parts 6 and 7 are provided protrudingly, a ring-shaped concave part 8 is formed between the convex parts 6 and 7, and then the outer diameter is set in the contact material mounting hole 2 as shown in FIG. 7mm, height 0.8mm A
The contact material 5 made of 12% g-CdO is penetrated, and then the upper and lower sides of the contact material 5 are crushed with a caulking punch as shown in FIG. The tapers 3' and 4' at both the upper and lower ends of 2 and the ring-shaped recess 8 at the middle of the inner peripheral surface were caulked.

On the other hand, to explain the conventional method of manufacturing an electrical contact using diagrams, as shown in FIG. Then, as shown in FIG. 6, the upper and lower peripheral edges of the contact material mounting hole 2 are provided with a depth as shown in FIG. 6.
Tapers 3 and 4 with a diameter of 0.1 mm and an inclination angle of 30 degrees are attached by punch molding, and then, as shown in Fig. 7, Ag-CdO1 with an outer diameter of 1.7 mm and a height of 0.8 mm is attached to the contact material mounting hole 2.
2% of the contact material 5, and then, as shown in FIG. Caulked tapers 3 and 4 on both ends.

The caulking strength of the contact material 5 was measured for each of 100 electrical contacts of the example and the conventional example thus obtained, and the results shown in Table 1 below were obtained.

[0011]

[Table 1]

As is clear from Table 1 above, the electrical contact of the conventional example had a low caulking strength of the contact material 5 and was unstable due to large variations, whereas the electrical contact of the embodiment It can be seen that the caulking strength is high and the variation is small and stable.

[0013]

[Effects of the Invention] As described above, according to the method of manufacturing an electrical contact of the present invention, the crimp strength of the contact material is high and the variation is small without increasing the taper of the upper and lower peripheral edges of the contact material mounting hole of the base material. A stable electrical contact can be easily obtained. In particular, in the case of a thin base material, the method for manufacturing an electrical contact of the present invention can reduce the amount of caulking to the taper of the upper and lower peripheral edges of the contact material mounting hole, thereby preventing the contact material from cracking and deforming the base material. This method is extremely effective because it can increase the caulking strength of the contact material while preventing this. In addition, even contact materials that are easily broken (hard to process) can be easily caulked.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the steps of an embodiment of the method for manufacturing an electrical contact of the present invention.

FIG. 2 is a diagram showing steps of an embodiment of the method for manufacturing an electrical contact of the present invention.

FIG. 3 is a diagram showing steps of an embodiment of the method for manufacturing an electrical contact of the present invention.

FIG. 4 is a diagram showing steps of an embodiment of the method for manufacturing an electrical contact of the present invention.

FIG. 5 is a diagram showing the steps of a conventional method for manufacturing an electrical contact.

FIG. 6 is a diagram showing the steps of a conventional method for manufacturing an electrical contact.

FIG. 7 is a diagram showing the steps of a conventional method for manufacturing an electrical contact.

FIG. 8 is a diagram showing the steps of a conventional method for manufacturing an electrical contact.

[Explanation of symbols]

1　Tableware 2 Contact material mounting hole 3', 4' taper 5 Contact material 6, 7 Convex part 8 Recessed part

Claims (1)

[Claims] Claim 1: Drill a hole for mounting a contact material in the base material, and then taper the upper and lower peripheral edges of the contact material mounting hole toward the inside of the hole to a depth of 1/10 to 1/4 of the thickness of the base material. At the same time, a ring-shaped convex portion is provided above and below the inner peripheral surface of the contact material mounting hole to form a ring-shaped recessed portion therebetween, and then the contact material is penetrated into the contact material mounting hole. A method for manufacturing an electrical contact, which comprises crushing the contact material from both the upper and lower sides and caulking it into the taper at both the upper and lower ends of the contact material mounting hole and the recessed part in the middle and high part of the inner circumferential surface flush with both the upper and lower surfaces of the base material.