JPS6079623A - Method of producing sole contact piece from tapelike composite electric contact material covered with gold metal from contact surface of copper alloy or the like - 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 (a) Technical Field The present invention relates to the production of composite electrical contacts in which a contact surface of silver or silver alloy is coated with gold or a gold alloy, for example, by alloy plating.

(r:I) Background of the Invention Generally, this type of composite electrical contact is made by cutting a long tape material to a desired length.

The above-mentioned type of contact material has a base made of nickel or nickel alloy for welding, or copper or copper alloy for welding, on the underside of the contact surface, while a thin gold or gold covering the contact surface. The purpose of the alloy film is to improve the stability of contact between the contact surfaces and to prevent the silver or silver alloy on the contact surfaces from undergoing chemical changes such as sulfidation and chloride.

There are various methods for coating silver or silver alloy contact surfaces with gold or gold alloy for this purpose, such as plating, vapor deposition, and cladding. The gold or gold alloy can be used in its raw state, i.e., before the tape is cut into single contacts of the desired dimension and length, it can completely cover the entire surface of the silver or silver alloy forming the contact surface. When the length of the tape material is cut in a direction transverse to the longitudinal direction, the cut end surface will be exposed to the outside.

Such an exposed cross section of silver or silver alloy easily causes a chemical change in a sulfuric or chloride atmosphere, and this surface becomes the tip of the chemical change, which extends to the surface coated surface of gold or gold alloy. .

(C) Disclosure of the Invention The present invention provides a single contact piece obtained by cutting a tape-shaped composite electrical contact material of the type described above, and the cut surface is not exposed to the outside and is cut while being covered with gold or gold alloy. The present invention provides a method for manufacturing a single contact piece.

Further, the method of the present invention will be specifically described as follows.

In the method of the present invention, for example, the upper and side edges of a contact surface made of silver or a silver alloy having a semi-arc cross section or the entire arc-shaped surface are covered with gold or a gold alloy, and the lower surface of the contact surface is covered with gold or a gold alloy. Arrowhead-shaped stamped parts are made at certain intervals in the direction transverse to the longitudinal direction of the tape on the -1 side of the tape-shaped composite contact having a composite base for spot welding or caulking.

It is necessary that this arrow-shaped engraved portion reach at least the bottom surface of the silver or silver alloy forming the contact surface. For example, by pressing the tape-shaped contact material inward from the top surface of the contact material with an arrow-shaped rib provided on the outside of the roller, the gold or gold alloy forming the first surface of the contact surface is pressed inward. The notch is expanded and indented in the shape of an arrowhead, and the entire side surface of the notch is covered with gold or gold alloy. The cut surface of the single contact piece obtained by cutting is not exposed to the outside. Of course, this cutting may be performed simultaneously with the formation of the arrowhead notch.

(d) Example: A long tape with a trapezoidal cross-sectional shape, an upper side of Q, 9+em, a lower side of 1.0 mm, and a minute protrusion for spot welding with a half-arc cross-section extending in the longitudinal direction on the lower side. A composite electrical contact material of the shape was created.

The contact surface of this composite electrical contact material is made of pure silver and its thickness is 0.2
The upper side and both sides of the trapezoidal cross-sectional shape are all plated with Au-Ag (10% by weight) gold alloy to a thickness of 3 mm, and the lower surface of this contact surface is 0.3 mm thick.
A base of +am thick Cu-Ni (20% by weight) is composited.

This tape-shaped composite contact material is intermittently fed with a grip feeder, and the longitudinal direction of the tape is fed horizontally every 2.0 cm in the longitudinal direction of the tape. , 13 - Arrow-shaped notches extending in the right angle direction were imprinted on the tape at a rate of 100 per minute.

The depth of each notch was 0.32 mm, and the convergence angle was 30 degrees. The tape was then cut into individual contact pieces at the tip of the notch. In this case, as described above, the depth of the arrowhead-shaped notch may be increased and the tape may be cut to a desired length at the same time as the notch is formed. In addition, although pure silver was used for the contact surface in this example, Ag-Ni, Ag-Cd0゜Ag-S
Of course, various silver alloys can be used, such as nOz alloys.

The obtained electrical contact piece was placed in sulfide gas (10 ppm) for 10 min.
When an accelerated sulfurization resistance test was performed after 0 hours of exposure, no discoloration was observed on the contact surface. This is because the pure silver on the contact surface is covered with an Au-Ag alloy over its entire surface including the cut surface, and the pure silver has no sulfurization, and the outer surface of the Au-Ag alloy has no sulfurization.
This shows that there was no dislocation in the Ag alloy coating.

Patent applicant Kazuo Wakasugi, Commissioner of the Patent Office, Chugai Electric Industry Co., Ltd.1. Show special request for the incident! f-/Do711-20a Relationship with the case of the person making the amendment Name of patent applicant Chugai Electric Industry Co., Ltd. 4, Agent G Contents of amendment 2, scope of claims (1) Silver or silver A long tape-like material having an alloy contact surface and a composite welding or caulking base in front of the contact surface, and the entire outer surface of the contact surface is covered with gold or gold alloy. The method is used to manufacture single contact pieces by cutting the composite electrical contact material at desired intervals in the direction transverse to the longitudinal direction of the composite electrical contact material, and the planned νJ is Forming an arrow-shaped notch extending along the broken wire, the tip of which reaches at least the bottom surface of the silver or silver alloy forming the contact surface, and the gold or gold alloy covering the contact surface extending on the inner surface. The above method is characterized by:

(2) The method according to claim 1, wherein the formation of the arrowhead-shaped notch and the cutting of the tape are performed at the same time.

Written by IE (spontaneous) 1. 41 indications Patent Application No. 187420/1987 2. Name of the invention A single unit made of a tape-shaped composite electrical contact material whose contact surface is coated with a gold alloy or the like, such as a silver alloy. Method for manufacturing a contact piece 3, relationship with the skin case for amendment Patent applicant name Chugai Electric Industry Co., Ltd. 4, "Claims" and "Detailed description of the invention" in the attorney's specification
Insert the following text.

"Furthermore, in the present invention, it is preferable that the surface of the gold or gold alloy that covers the contact surface of the silver or silver alloy is forged by friction processing using a spinner or the like. As mentioned above, even when the arrowhead-shaped stamped part is pressed, the surface of the gold alloy can easily extend into the stamped part without cracking. It also eliminates distortion during plating and vapor deposition on the surface.'' (3) Insert the following sentence next to ``Of course.'' on the 3rd line of 6F of the specification.

``In addition, before the step of carving an arrowhead-shaped notch on the Au-Ag alloy that covers the pure silver on the contact surface, it is recommended that the gold alloy be forged (67). While moving, the silver is vibrated with an amplitude of 1Og using ultrasonic waves, and is struck by an anvil having an angle of 45° with respect to the gold alloy surface.'' 2. Claims (1) Silver Or a long tape having a silver alloy contact surface and a composite welding or caulking base on the lower surface of this contact surface, and the entire outer surface of the contact surface is covered with gold or gold alloy. A method of manufacturing a single contact piece by cutting a shaped composite electrical contact material at desired intervals in a direction transverse to its long longitudinal direction, and before cutting, the method involves cutting along the planned cutting line. The above-mentioned method is characterized in that the tip extends to at least reach the bottom surface of the silver or silver alloy forming the contact surface, and forms an arrow-shaped notch on the inner surface of which the gold or gold alloy covering the contact surface extends. the method of.

(2) The method according to claim 1, wherein the formation of the hook-shaped notch and the cutting of the tape are performed at the same time.

(3) The method according to claim 1, wherein the gold or gold alloy covering the outer surface of the contact surface is forged before forming the arrowhead-shaped notch.

Claims (2)

[Claims] (1) It has a contact surface made of silver or silver alloy, and a welding or caulking base combined with the outer surface of this contact surface, and the entire outer surface of the contact surface is covered with gold or gold alloy. A method of manufacturing a single contact piece by cutting a long tape-shaped composite electrical contact material at desired intervals in a direction transverse to the longitudinal direction of the long tape, and pre-planned before cutting. Extending along the cutting line, the tip thereof reaches at least the bottom surface of the silver or silver alloy forming the contact surface, and J4. 2. The method according to item 1, characterized in that an arrow-like notch is formed on the inner surface of the shaft, in which gold or gold alloy covering the contact surface extends. (2) Formation of the arrowhead-shaped notch and cutting of the tape are performed while the tape is being recycled.