Method for manufacturing flake-like arc contact finger

Abstract

The invention discloses a method for manufacturing a flake-like arc contact finger and belongs to the machining technology of high-voltage electric appliance parts. The method for manufacturing the flake-like arc contact finger comprises the following steps of: performing composite pressing on two kinds of powder under the environment of inert gas (nitrogen or argon) or reducing gas (hydrogen) ora mixture of the inert gas and the reducing gas which serves as protective gas; sintering at high temperature of above the melting point of copper, and performing plastic deformation through composite pressing; improving physical and mechanical performances of the copper through pressure machining; and performing planar machining to obtain the flake-like arc contact finger. In the method, copper tail is manufactured by performing mould pressing on copper powder and the appearance of the arc contact finger is guaranteed by a composite pressing mode, so that the utilization ratio of the materials is over 95 percent. Copper tungsten and copper are sintered through a high-temperature liquid phase to obtain a metallurgical composite interface which has the characteristics of high mechanical strength, high flow conductivity, no hidden dangers such as radiation and the like during power on, no turn-about phenomenon and the like. The working strength is guaranteed and the abrasion of contact parts is reduced. The manufactured flake-like arc contact finger saves materials.

Description

technical field [0001] The invention belongs to the technical scope of high-voltage electric parts processing, and in particular relates to a method for manufacturing a sheet arc contact finger. Background technique [0002] Chip contacts are widely used in various medium and high voltage power switches, and are the core components of power equipment. They are divided into conductive contacts and arc contacts according to their uses. The conductive contact finger is generally stamped by copper plate or copper strip; the arc contact finger is used to start the arc when the contact and the contact finger are disconnected. In terms of composition, the arc contact finger is composed of two parts: the arc extinguishing end and the conductive end. The arc-extinguishing end is made of copper-tungsten alloy, and the conductive end is made of copper. The two parts are composited by welding and sintering. [0003] Sheet arc contact fingers are used in various high-voltage electrical ...

AI Technical Summary

Problems solved by technology

Silver-copper alloy is a medium-temperature solder with a relatively low melting point. When a high-voltage power switch is exposed to a high temperature instantaneously and generates high temperature, the solder layer is easy to melt and turn around, causing accident hazards.

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