JPH05282960A - Manufactuer of electric contact - Google Patents

Abstract

(57) [Abstract] [Purpose] The base material is less deformed, and the high caulking strength of the contact material can be obtained with a small caulking force, and the dimension from the reference position of the base material to the contact can be stabilized. , A method capable of obtaining a highly accurate electrical contact is provided. [Structure] The contact mounting hole is punched and hole-formed while feeding the strip base material in order, and on the other hand, the clad contact strip is formed with a concave groove in the center longitudinal direction of the lower surface from the direction orthogonal to the feed direction of the strip base material. Sequential feeding while forming, then insert the clad contact material obtained by punching out the clad contact material at the position of the contact mounting hole of the strip base material outside the concave groove into the contact mounting hole. After progressive feeding of the band-shaped base material having the clad contact material that has been temporarily caulked, the concave groove of the clad contact material is expanded to the outside and caulked in the contact mounting hole, and then the clad contact material is caulked A method for manufacturing an electrical contact, which comprises pressing a material into a required shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an electrical contact for a general household electric appliance switch, and more particularly to an improvement of a method of manufacturing an electrical contact by crimping the contact material on a thin plate base material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a method of manufacturing an electric contact by caulking a contact material on a thin plate material (spring material) has a contact mounting hole 2 formed on a thin plate material 1 and then a contact. As shown in FIG. 8, the contact material 3 obtained by punching out the contact strip material in the mounting hole 2 is tentatively caulked, and then the contact material 3 is formed to form the contact head and the contact leg portion to form the electrical contact 4 Was to get.

By the way, the manufacturing method of the above electrical contact is
Since the contact material 3 is tentatively caulked into the contact mounting hole 2 of the base material 1 and then molded, the contact mounting hole 2 expands and the caulking strength becomes low. Further, the base material 1 is deformed (distorted), and the dimension from the reference position to the contact material 3 varies, resulting in poor accuracy.

[0004]

Therefore, according to the present invention, the caulking strength of the contact material is high, the deformation (strain) of the base material is small, and the dimension from the reference position of the base material to the contact material can be stabilized, It is intended to provide a method capable of making an electrical contact with high precision.

[0005]

According to the method of manufacturing an electrical contact of the present invention for solving the above-mentioned problems, a contact mounting hole is punched and hole-formed while sequentially feeding a strip base material. Of the clad contact strip from the direction orthogonal to the feeding direction while forming a concave groove in the center longitudinal direction of the lower surface of the clad contact strip, and then the clad contact strip at the position of the contact mounting hole of the strip base material. Insert the clad contact material obtained by punching out at the outer position into the contact mounting hole and tentatively crimp it, and then, after progressive feeding of the strip base material with this tentatively crimped clad contact material, expand the concave groove of the clad contact material to the outside. This is characterized in that the contact mounting holes are fully caulked, and then the clad contact material is caulked and the band-shaped base material is punched out into the required shape.

[0006]

As described above, the method of manufacturing the electrical contact of the present invention is
The pre-formed clad contact material without press formed with a groove on the bottom surface is inserted into the contact mounting hole of the band-shaped base material, and after temporarily caulking, the caulking is performed, so there is little or little deformation of the band-shaped base material during the caulking. High crimping strength can be obtained by crimping force, and since the band-shaped base material is punched out after the caulking to the required shape, it is possible to stabilize the dimension from the reference position of the base material to the contact point, and highly accurate electrical contact Can be obtained.

The method of manufacturing an electrical contact according to the present invention prevents deformation of the strip-shaped base material particularly when the preformed clad contact material is inserted into the contact mounting hole of the thin strip-shaped base material and temporarily crimped and when the crimping is performed. This is advantageous because it can be done.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for producing an electric contact of the present invention will be described with reference to the drawings. While feeding a strip base material 5 made of phosphor bronze having a thickness of 0.1 mm and a width of 20 mm shown in FIG. The contact mounting hole is punched and hole forming is performed to obtain the diameter.
A contact mounting hole 7 of 1.9 mm is formed, AuAg having a thickness of 0.2 mm and a width of 3 mm from the direction orthogonal to the feeding direction of the one-sided strip base material 5.
A clad contact strip 10 made by inlay-bonding a 8% / Ag clad tape 8 to a Cu base strip 9 having a thickness of 0.6 mm and a width of 6 mm has a diameter of 1.2 at a pitch of 2.5 mm in the central longitudinal direction of the lower surface.
Pilot hole 6 while forming a groove 11 with a depth of 0.3 mm and a depth of 0.3 mm
2 and obtained by pressing the clad contact strip 10 at the position of the contact mounting hole 7 of the strip base material 5 at the position outside the concave groove 11 and having a diameter of 1.8 mm and a height of 0.6. mm circular clad contact material 12 is inserted into the contact mounting hole 7 to perform temporary caulking, and then the provisional caulking of the strip-shaped base material 5 having the clad contact material 12 is performed. As shown in FIG. 3, it is expanded to the outside and caulked in the contact mounting hole 7, and then the clad contact material 12 is caulked to form a strip base material 5 into a semi-elliptical shape with an arc at one end as shown in FIG. The press was removed to obtain an electric contact 13.

Next, another embodiment of the method for producing an electric contact of the present invention will be described with reference to the drawings. The thickness shown in FIG.
While feeding the strip-shaped base material 5 made of phosphor bronze having a width of 20 mm in sequence through the pilot hole 6, the contact mounting hole is punched and hole-formed to form a rectangular contact mounting hole 7'having a length of 3 mm and a width of 1.6 mm. On the other hand, the thickness is more than the direction orthogonal to the feeding direction of the strip base material 5.
A clad contact strip 10 in which 0.2 mm wide and 2.5 mm wide AuAg 8% / Ag clad tape 8 is 0.6 mm thick and 10 mm wide is inlaid on a Cu base strip 9 is 1 mm wide and 1 mm deep in the longitudinal direction at the bottom center. It was obtained by progressively feeding the strip-shaped groove 16 having a length of 0.2 mm, and then pressing the clad contact strip 10 at the position of the contact-mounting hole 7'of the strip-shaped base material 5 at a position outside the strip-shaped groove 16. 2.9mm height, 1.5mm width, 0.6mm height shown in Figure 5
The rectangular clad contact material 17 is inserted into the contact mounting hole 7 ′ for temporary crimping, and the clad contact material 5 having the clad contact material 17 for which the temporary crimping has been performed is sequentially fed.
The groove 16 of 17 is expanded outward as shown in FIG. 6 and caulked into the contact mounting hole 7 ', and then the clad contact material 17 is caulked into the strip base material 5 as shown in FIG. Then, the electrical contact 18 was obtained by press molding into a rectangular shape.

On the other hand, the conventional method for manufacturing an electrical contact will be described with reference to the drawings. A contact mounting hole 2 having a diameter of 1.9 mm is formed in a base material 1 made of phosphor bronze having a thickness of 0.1 mm and a width of 20 mm shown in FIG.
Next, as shown in Fig. 8, the contact mounting hole 2 has a thickness of 0.6 mm and a width of 6 mm.
mm contact material made of AuAg10 / Ag / Cu is punched out, and the contact material 3 having a diameter of 1.8 mm and having an arc top surface is temporarily crimped, and then the contact material 3 is formed to form the contact head and contact leg. Then, the electrical contact 4 was obtained.

When the caulking strengths of the contact materials in the electric contacts of Examples 1 and 2 and the conventional example thus obtained were measured, it was found that the caulking strength of the contact materials in the electric contact 4 of the conventional example was 10 pieces and the average was 8 kg. On the other hand, the electrical contacts 13 and 18 of Examples 1 and 2
The caulking strength of the contact material in 10 was 15 kg on average, and the caulking strength was remarkably high. Further, when the variation in height from the upper surface of the base material to the upper surface of the contact material was measured, the average of ten electric contacts 4 in the conventional example was 0.15 mm, whereas the electric contacts 13, 18 in the example were In, the average of 10 is 0.08mm
Therefore, there was little variation. Although the clad contact strip material 10 is an inlay material in the above embodiment, the material is not limited to this and may be an overlay material.

[0012]

As can be seen from the above description, according to the method for manufacturing an electric contact of the present invention, the deformation of the belt-shaped base material is small, and a high caulking strength of the contact material can be obtained with a small caulking force. The dimension from the reference position of the base material to the contact can be stabilized, and an electric contact with high accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a method for manufacturing an electric contact according to the present invention.

FIG. 2 is a cross-sectional view of a clad contact material obtained by stamping out a clad contact strip in an embodiment of the method for producing an electric contact of the present invention.

FIG. 3 is a cross-sectional view showing a state where the clad contact material of FIG. 2 is temporarily caulked on a strip base material and then caulked.

FIG. 4 is a plan view showing another embodiment of the method for manufacturing an electric contact according to the present invention.

FIG. 5 is a cross-sectional view of a clad contact material obtained by stamping out the clad contact material in another example of the method for producing an electrical contact according to the present invention.

6 is a cross-sectional view showing a state in which the clad contact material of FIG. 5 is temporarily caulked on a strip base material and then caulked.

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

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

[Explanation of symbols]

 5 Belt-shaped base material 7, 7'Contact mounting hole 10 Cladding contact belt material 11 Recessed groove 12 Cladding contact material 13 Electrical contact 16 Belt-shaped groove 17 Cladding contact material 18 Electrical contact

Claims (1)

[Claims] 1. A contact mounting hole is punched and hole-formed while feeding a strip base material in order, and a clad contact strip material is recessed in the center longitudinal direction of its lower surface from a direction orthogonal to the feed direction of the strip base material. While forming the clad contact material, and then the clad contact material obtained by punching out the clad contact material at the position of the contact mounting hole of the strip base material at a position outside the groove is temporarily inserted into the contact mounting hole. After caulking, and then progressively feeding the band-shaped base material having this temporarily caulked clad contact material, the concave groove of the clad contact material is expanded to the outside and caulked in the contact mounting hole, and then the clad contact material is caulked A method for manufacturing an electrical contact, which comprises stamping a base material into a desired shape.