JP2997080B2 - Electrical contact and method of manufacturing the same - 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 of manufacturing an electrical contact used for a relay, a switch, and the like, and more particularly to a caulked contact capable of increasing an effective joint area with a spring material.

[0002]

2. Description of the Related Art A conventional caulking contact is formed by inserting a foot portion of a rivet contact into a hole of a spring material and then caulking the foot portion and attaching it to the spring material as shown in FIG. . However, in the above method, the adhesion between the rivet contact and the spring material becomes a problem. Or cracks had occurred. As a result, if the gap is left open, the electrical resistance between the contact surface and the spring material will increase, or it will fall off during use due to weak caulking strength, and the heat dissipation to the spring material will be poor and welding will occur due to temperature rise. And the like, which leads to a fatal defect such as a shortened life.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has no gap with the spring material, and therefore has a large effective joint area with the spring material, and does not cause deformation or warpage of the spring material. Accordingly, an object of the present invention is to provide a stable and reliable long-life electrical contact with the opposed contact and a method of manufacturing the same.

[0004]

The technical means of the present invention for solving the above-mentioned problem is to insert a foot portion of a rivet contact in which a brazing material is previously attached to a step between a head and a foot into a hole of a spring material. After the caulking, the surface of the rivet contact and the spring material are electrically heated and brazed, and brazed to the spring material at least at the step between the head and the foot of the rivet contact, and caulked. It is characterized by being performed. In addition, after inserting the foot of the rivet contact with the brazing material previously attached to the step between the head and the foot into the hole of the spring material, and then conducting heat between the rivet contact surface and the spring material, It is characterized by comprising a brazing step and a caulking step.

[0005]

According to the electrical contact and the method of manufacturing the same according to the present invention, the rivet contact and the spring material are securely joined to each other by the brazing material previously attached to the step between the head and the foot. Since it can be brazed by area, there is no influence of the gap between the rivet contact and the spring material, and there is no strong caulking to prevent the gap, so cracks may occur at the contacts, The material does not deform, warp or crack. In addition, since the space between the rivet contact surface and the spring material is brazed by energizing and heating, the rivet contact and the spring material can be securely brazed without affecting the spring material. Note that either crimping after brazing or brazing after crimping may be used, as long as it is brazed and caulked to the spring material at least at the step between the head and foot of the rivet contact. Good thing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment and a conventional example will be described below.

First, as a first embodiment, as shown in FIG.
gCdO12% / Cu with head diameter 3.5mm, head thickness 1.0mm,
A rivet contact 1 having a foot diameter of 2.0 mm, a foot length of 2.0 mm, and a brazing material of AgCu28 having a thickness of 0.05 mm attached to a step between a head and a foot is made of phosphor bronze and has a thickness of 0.08. mm,
After inserting the foot of the rivet contact into the hole of 2.05 mm diameter provided in the spring member 2 having a width of 4 mm, the foot was caulked and formed. Then, as shown in Fig. 3, the same shape as the contact surface and shallower than head thickness 0.6
Upper electrode 4 made of CuBe 0.2% material having a concave portion 3 of mm
And a lower electrode 6 of CuBe 0.2% material having a recess 5 having a diameter 2.5 mm wider than the foot diameter after caulking and a depth 5 mm deeper than the height of the foot after caulking and having a depth of 1.5 mm, and brazing. Was performed to obtain 100 electrical contacts 7 shown in FIG.

As a second embodiment, as shown in FIG.
/ Cu dimensions are 3.5mm head diameter, 1.0mm head thickness, 8R curvature of contact surface, Ag part thickness 0.5mm, foot diameter 2.0mm, foot length 2.0mm
In the step between the head and the foot, the material Ag-C with a wire diameter of 0.3mmφ
Riveted contact 1 'with u28 brazing material attached
After inserting the foot portion of the rivet contact into a hole of 2.05 mm diameter provided in a spring material 2 'made of BeCu having a thickness of 0.8 mm and a width of 4 mm and having the same curvature as that of the contact surface as shown in FIG. Material CuCr1 having a concave portion 3 'with a depth of 0.4mm shallower than the head thickness.
8% lower electrode 6 'and 2.5mm diameter wider than foot diameter of rivet contact, 2.5% deeper than foot height of rivet contact
The upper electrode 4 'made of CuCr 1.8% and having a concave portion 5' of mm was electrically heated and brazed. Thereafter, the feet of the rivet contacts are caulked and formed to form electrical contacts 7 'shown in FIG.
100 were obtained.

On the other hand, as a conventional example, as shown in FIG.
The rivet contact 8 and the spring material 9 having the same dimensions and shape as those of the first embodiment are formed by caulking of the foot, except that the brazing material is not attached with CdO12% / Cu, and the electric contact 10 shown in FIG.
100 were obtained. However, an evaluation test was carried out using 10 samples each, and the following results were obtained.

[0010]

[Table 1]

As an evaluation method, caulking strength is a strength at which a rivet contact foot is compressed by a pin and broken. The temperature rise is 25A for electricity, opening / closing frequency 20 times / min, contact pressure 18-20g /
Contact temperature after switching 100,000 times under cm ² test condition. The electric resistance was measured with a milliohm meter between the spring material and the contact in the four-terminal method. The rivet contact may be a clad contact or a solid contact, and the brazing material joined to the rivet contact may be linear or plate-shaped.For example, the wire may be wound around the foot of the rivet contact, or may be previously formed in a ring shape. After that, the fitting is performed, or after the plate material is pressed from the band material, the fitting is performed as appropriate.

[0012]

As is apparent from the above results, according to the electrical contact and the method of manufacturing the same of the present invention, the brazing material is previously joined to the step between the head and the foot, and the rivet contact surface is Since there is no gap between the spring and the spring, there is no gap between the spring and the spring.Therefore, there is no large effective joint area with the spring, and no deformation or warpage of the spring occurs. It has an excellent effect that a stable, long-life electrical contact with high contact stability can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an electric contact of the present invention.

FIG. 2 is a view showing a rivet contact used in the embodiment of the present invention;

FIG. 3 is a cross-sectional view illustrating electric heating according to the embodiment of the present invention.

FIG. 4 is a view showing a rivet contact used in the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing electric heating according to the embodiment of the present invention.

FIG. 6 is a sectional view showing an embodiment of the electric contact of the present invention.

FIG. 7 is a sectional view showing a conventional rivet contact.

FIG. 8 is a sectional view showing a conventional electric contact.

[Explanation of symbols]

 1, 1 'rivet contact 2, 2' spring material 7, 7 'electrical contact

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 1/00 H01H 1/06 F16B 19/04-19/05 H01H 11/06

Claims (2)

(57) [Claims] 1. An electric contact, wherein the electric contact is brazed and caulked to a spring material at least at a step of a head and a step of a rivet contact. 2. After inserting a foot portion of a rivet contact in which a brazing material is previously attached to a step portion between a head portion and a foot portion, into a hole of a spring material,
A method for manufacturing an electrical contact, comprising: a step of conducting heat and brazing between a surface of a rivet contact and a spring material; and a step of caulking.