JP3058201B2 - Manufacturing method of electrical contacts - Google Patents

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 an electric contact, and more particularly to an improvement in a method for manufacturing an electric contact in which a contact material is caulked on a base material.

[0002]

2. Description of the Related Art Conventionally, in order to make an electrical contact in which a contact material is caulked on a base material, a contact material mounting hole 2 is formed in the base material 1 as shown in FIG. As shown in FIG. 6, tapered portions 3 and 4 are formed on the upper and lower peripheral edges of the contact material 2, and then the contact material 5 is passed through the contact material mounting hole 2 as shown in FIG. As shown in FIG. 8, the base material 1 is crushed from both sides and caulked to tapers 3 and 4 flush with both upper and lower surfaces.

However, the electrical contact made in this manner has a low crimping strength because the contact material 5 is merely crimped at the tapered portions 3 and 4 at the upper and lower peripheral edges of the contact material mounting hole 2. It was unstable. Therefore, it is conceivable to increase the tapping strength of the contact material by increasing the taper 3 or 4. However, if the taper 3 or 4 is increased, the base material 1 is deformed and defective products are generated.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method of manufacturing an electrical contact which can stabilize the caulking strength of a contact material at a high level without increasing the taper at both upper and lower edges of a contact material mounting hole of a base material. It is intended to provide.

[0005]

According to the present invention, there is provided a method of manufacturing an electrical contact, comprising the steps of: forming a contact material mounting hole in a base material; and forming a contact material mounting hole in the upper and lower peripheral edges of the contact material mounting hole. Apply taper processing to the inside of the hole to a depth of 1/10 to 1/4 of the plate thickness of the base material, and protrude ring-shaped protrusions on the upper and lower surfaces of the inner peripheral surface of the contact material mounting hole, with a ring shape between them The contact material is then penetrated into the contact material mounting hole, and then the upper and lower sides of the contact material are crushed, and the upper and lower ends of the contact material mounting hole are flush with the upper and lower surfaces of the base material. It is characterized in that it is caulked in a concave part at the middle and high part of the inner peripheral surface.

In the method for manufacturing an electric contact according to the present invention, the depth of the taper processing to be performed on 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. Reason,
If it is less than 1/10, it is difficult to form a ring-shaped convex portion at the lower end of the taper, so that a concave portion necessary for caulking is not formed, and if it exceeds 1/4, a ring-shaped convex portion is formed, but the upper and lower ring-shaped convex portions are formed. The reason for this is that the projections come together and eliminate the depressions required for swaging.

[0007]

As described above, the method for manufacturing an electric contact according to the present invention comprises:
The upper and lower ends of the contact material mounting hole of the base material are tapered, and a ring-shaped convex portion is protruded at the inner end of each taper, so that a ring-shaped concave portion is formed between the ring-shaped convex portions. When the contact material is penetrated into the contact material mounting hole and the upper and lower sides are crushed, the contact material expands at the middle and high parts and fills the ring-shaped recess and is caulked, and the upper and lower ends are tapered flush with the upper and lower surfaces of the base material It is caulked and has a high caulking strength and is stable.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the method for producing an electric contact according to the present invention will be described with reference to the drawings. As shown in FIG. 1, a contact material having an inner diameter of 2 mm is attached to the tip of a base material 1 made of phosphor bronze having a thickness of 0.5 mm. Drill the mounting hole 2 and then, at the top edge and the bottom edge of the contact material mounting hole 2, into the hole 2 to a depth of 0.1 m as shown in FIG.
m, a taper 3 ', 4' with an inclination angle of 30 degrees is formed by punching, and a convex part of a ring of height 0.15 mm is formed on the upper and lower surfaces of the inner peripheral surface of the contact material mounting hole 2, that is, on the inner end of the taper 3 ', 4'. 6, a ring-shaped concave portion 8 is formed between the convex portions 6 and 7, and then, as shown in FIG.
The contact material 5 made of Ag-CdO 12% having a height of 0.8 mm and a height of 0.8 mm is penetrated, and then the upper and lower sides of the contact material 5 are caulked as shown in FIG. The contact material mounting hole 2 was caulked into the taper 3 ', 4' at the upper and lower ends of the contact material mounting hole 2 and the ring-shaped recess 8 at the middle and high part of the inner peripheral surface.

On the other hand, a method of manufacturing a conventional electric contact will be described with reference to the drawings. As shown in FIG. 5, a contact material mounting hole 2 having the same dimensions as the embodiment is formed at the tip of the same base material 1 as the embodiment. Then, as shown in FIG. 6, the depth of the contact material mounting hole 2 at the upper edge and the lower edge of the contact material mounting hole 2 toward the inside of the hole 2 as shown in FIG. 6.
Tapers 3 and 4 having a diameter of 0.1 mm and an inclination angle of 30 degrees are punched, and then the outer diameter of the contact material mounting hole 2 is set as shown in FIG.
The contact material 5 made of Ag-CdO 12% having a thickness of 1.7 mm and a height of 0.8 mm is penetrated, and then the upper and lower sides of the contact material 5 are caulked as shown in FIG. And the upper and lower ends of the contact mounting hole 2 were tapered.

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

[0011]

[Table 1]

As is apparent from Table 1, the electric contact of the conventional example has a low caulking strength of the contact material 5 and a large variation, and is unstable. It can be seen that the caulking strength is high, the dispersion is small, and it is stable.

[0013]

As described above, according to the method for manufacturing an electric contact of the present invention, the caulking strength of the contact material is high and the variation is small without increasing the taper at the upper and lower peripheral edges of the contact material mounting hole of the base material. And a stable electrical contact can be easily obtained. In particular, the method for manufacturing an electrical contact according to the present invention can reduce the amount of caulking of the contact material mounting holes into the upper and lower peripheral edges, in the case of a thin base material, so that the contact material does not crack and the base material is deformed. This is extremely effective because the crimping strength of the contact material can be increased while preventing the occurrence of the problem. Even a contact material that is easily broken (hard to process) can be easily caulked.

[Brief description of the drawings]

FIG. 1 is a view showing the steps of an embodiment of the method for producing an electric contact of the present invention.

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

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

FIG. 4 is a view showing the steps of an embodiment of the method for producing an electric contact of the present invention.

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

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

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

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

[Explanation of symbols]

 Reference Signs List 1 base material 2 contact material mounting holes 3 ', 4' taper 5 contact material 6, 7 convex portion 8 concave portion

Claims (1)

(57) [Claims] 1. A contact material mounting hole is formed in a base material, and a taper is formed at an upper peripheral edge and a lower peripheral edge 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. A ring-shaped convex part is formed on the top and bottom of the inner surface of the contact material mounting hole, and a ring-shaped concave part is formed between them. Then, the contact material is pierced through the contact material mounting hole. A method of manufacturing an electrical contact, comprising: crushing contact material from both upper and lower sides and crimping the taper at upper and lower ends of a contact material mounting hole and a concave portion at a middle and high portion of an inner peripheral surface to be flush with upper and lower surfaces of a base material.