JPH0119214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an electric contact with a spherical contact.

Conventionally, in order to make an electric contact 2 with a spherical contact 1 shown in FIG. 1, a lower mold 6 is inserted from below into the contact mounting hole 4 of the spring terminal material 3 that is intermittently fed as shown in FIG. 2a. Immediately after inserting the leg 7b of the rivet contact 7 having the spherical head 7a, which is fitted into the hole 6' and provided with the push-up pin 5 having the recess 5a, as shown in FIG. The end of the leg 7b
As shown in Figure c, use the caulking punch 8 to tighten the contact mounting hole 4.
It was caulked around the rim.

By the way, the method for manufacturing the electric contact 2 with the spherical contact 1 is to fit it into the hole 6' of the lower mold 6 and to form the recess 5a.
When the rivet contact 7 is pushed up with the push-up pin 5 having a spherical shape, the rivet contact 7 becomes unstable and tends to tilt as shown in FIG. The center of the hole 4 and the center of the rivet contact 7 are difficult to match. Therefore, the leg portion 7b of the rivet contact 7 cannot be smoothly inserted into the contact mounting hole 4, and the spherical contact 1 may be misaligned with the contact mounting hole 4, biased, or the mounting strength (caulking strength, twisting strength ), and there are many other manufacturing troubles that are hindering speed-up in the automatic production line of the electrical contact 2.

The present invention has been developed in view of the above circumstances, and it is possible to align the center of the rivet contact with the center of the contact mounting hole and smoothly insert the leg portion of the rivet contact into the contact mounting hole, thereby preventing defective products and manufacturing problems. It is an object of the present invention to provide a method for manufacturing an electric contact with a spherical contact that does not generate.

The method for manufacturing an electric contact with a spherical contact of the present invention includes:
As shown in Fig. 4a, a lower mold 6 is inserted from below into the contact mounting hole 4 of the spring terminal material 3 that is intermittently fed.
The leg 9b of the rivet contact 9 having a flat head 9a is inserted into the hole 6' of the rivet contact 9 with a push-up pin 5' having a flat top as shown in FIG. The end of 9b is temporarily crimped around the periphery of the contact mounting hole 4, and then the spring terminal material 3 is sent to the next position and the rivet contact is secured using a forming punch 10 having a spherical recess 10a as shown in FIG. 4c. 9 is formed into a spherical shape, and at the same time, the ends of the legs 9b are crimped to the periphery of the contact mounting hole 4 using a crimping punch 8.

In the method of manufacturing an electric contact with a spherical contact according to the present invention, the reason why the leg portion 9b of the rivet contact 9 having the flat head 9a is inserted into the contact mounting hole 4 of the spring terminal material 3 is because the flat upper portion is When the rivet contact 9 is pushed up with the push-up pin 5', the head 9a
Since the rivet contact 9 is flat, the rivet contact 9 is stable and does not tilt, and the center of the contact mounting hole 4 of the spring terminal material 3 can be aligned with the center of the rivet contact 9. Therefore, the legs of the rivet contact 9 This is because the portion 9b can be smoothly inserted into the contact mounting hole 4.

In addition, the leg portion 9b of the rivet contact 9 is inserted into the contact mounting hole 4.
The reason why the end of the leg 9b is temporarily crimped to the periphery of the contact mounting hole 4 immediately after the spring terminal material 3 is inserted into the contact mounting hole 4 is that when sending the spring terminal material 3 to the next position, the end of the leg 9b is inserted into the contact mounting hole 4.
This is to prevent the rivet contact 9 inserted through it from falling off.

Furthermore, the flat head of the rivet contact 9 is shaped into a spherical shape, and at the same time the end of the leg 9b is inserted into the contact mounting hole 4.
The reason for crimping around the periphery of the required spherical contact 1 is that
This is to obtain an electrical contact 2 with a spherical contact 1 and to improve the mounting strength of the spherical contact 1. That is, by shaping the flat head 9a into a spherical shape, the head 9a
is also crushed and caulked around the periphery of the contact mounting hole 4,
The spherical contact 1 is caulked to both sides of the spring terminal material 3, thereby improving the mounting strength.

Hereinafter, specific examples and conventional examples of the method for manufacturing an electric contact with a spherical contact according to the present invention will be described.

Example Thickness fed intermittently as shown in Figure 4a
A contact mounting hole 4 with a diameter of 1.5 mm of a spring terminal material 3 made of Cu-Ti3 wt. 0.2 mm, width 4 mm, and length 15 mm is fitted into the hole 6' of the lower die 6 from below to form a spring terminal material 3 with a diameter of 2.1 mm. A rivet contact 9 made of 10% by weight Ag-Cu with a flat head 9a of 2.2 mm in diameter and 1.91 mm thick supplied with a push-up pin 5' with a flat top of 1.45 mm in diameter and 1.2 mm in length. mm leg portion 9b is inserted through the leg portion 9b as shown in FIG. As shown in FIG.
The leg part 9b is molded into a spherical shape with a height of 1.2 mm.
The end of the contact hole 4 was swaged around the periphery of the contact mounting hole 4 using a swage punch 8 to form a swaged portion with a diameter of 2 mm and a thickness of 0.51 mm to obtain an electric contact 2 with a spherical contact 1.

Conventional example Thickness fed intermittently as shown in Figure 2a
A contact mounting hole 4 with a diameter of 1.5 mm of a spring terminal material 3 made of Cu-Ti 3% by weight with a width of 0.2 mm, a width of 4 mm, and a length of 15 mm is fitted into the hole 6' of the lower mold 6 from below, and a diameter of 2.3 mm is fitted. The diameter of the rivet contact 7 made of 10% by weight of Ag-Cu is 1.45 mm, which has a spherical head 7a with a diameter of 2.4 mm and a height of 1.2 mm, which is supplied into the mold 6 by a push-up pin 5 having a concave portion 5a. Legs 7 with a length of 1.2 mm
Immediately after inserting the leg 7b as shown in FIG. 2b, insert the end of the leg 7b with a caulking punch 8 as shown in FIG.
2mm in diameter, caulk around the periphery of contact mounting hole 4 with
A caulked portion having a thickness of 0.51 mm was formed to obtain an electric contact 2 with a spherical contact 1.

When we inspected the quality of 100 electric contacts with one spherical contact of the example and the conventional example thus obtained, there were no defective products in the electric contacts of the example, whereas in the conventional example there were no defective products. There were 13 defective electrical contacts such as misalignment of the spherical contact 1 with the contact mounting hole 4, deviation, and extremely low mounting strength (crimping strength, twisting strength). This is because when the rivet contact 7 is pushed up with the push-up pin 5, the head 7
Since a is spherical, the leg 7 is unstable and tilted.
This is because b was forcibly inserted into the contact mounting hole 4 and its end was caulked.

As can be seen from the above explanation, according to the method of manufacturing an electric contact with a spherical contact of the present invention, the spring terminal material that is intermittently sent is fitted into the contact mounting hole of the lower mold from below. When pushing up the rivet contact with a push-up pin that has a flat top, the rivet contact remains stable and will not tilt because the head is flat, so insert the center into the contact mounting hole of the spring terminal material. By matching, the legs of the rivet contacts can be smoothly inserted into the contact mounting holes. Furthermore, since the ends of the legs of the rivet contacts inserted into the contact mounting holes are temporarily caulked, it is possible to prevent the rivet contacts from falling off when the spring terminal material is transferred. Furthermore, since the flat head is formed into a spherical shape and the ends of the legs are caulked at the same time, the resulting spherical contact is caulked on both sides of the spring terminal material, improving the attachment strength. Therefore, it is possible to obtain an electric contact with a ball-shaped contact of good quality, which is free from misalignment of the ball-shaped contact with the contact mounting hole, deviation, and extreme decrease in mounting strength (crimping strength, twisting strength), etc. This has the excellent effect of eliminating manufacturing troubles and speeding up the automatic line for manufacturing electrical contacts.

[Brief explanation of drawings]

Figure 1 is a perspective view of an electric contact with a spherical contact;
Figures a, b, and c are cross-sectional views of the main parts showing the steps of the conventional method for manufacturing electric contacts with spherical contacts. 4
Figures a, b, and c are cross-sectional views of main parts showing the steps of the method of manufacturing an electric contact with a spherical contact according to the present invention. 1...Spherical contact, 2...Electric contact, 3...Spring terminal material, 4...Contact mounting hole, 5'...Pushing pin with flat top surface, 6...Bottom mold, 6'...Hole Department,
8...Caulking punch, 9...Rivet contact, 9a
...Head, 9b...Legs, 10...Forming punch,
10a... Spherical recess.

Claims (1)

[Claims] 1. The leg part of the rivet contact with a flat head is fitted into the contact mounting hole of the spring terminal material that is sent intermittently from below using a push-up pin with a flat top that fits into the hole of the lower mold. After that, the spring terminal material is sent to the next position and the flat head of the rivet contact is inserted using a forming punch with a spherical recess. A method for producing an electric contact with a spherical contact, characterized in that the end of the leg is formed into a spherical shape and at the same time, the end of the leg is swaged around the periphery of a contact mounting hole using a swage punch.