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Machining method for constant-arc contact special-shaped bank

A processing method and special-shaped row technology, which is applied in the field of processing fixed-arc contact special-shaped rows, can solve the problems of rough surface, low surface hardness, and large accumulated errors, so as to reduce surface roughness, increase surface hardness, and reduce processing errors Effect

Inactive Publication Date: 2016-03-16
宋和明
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Problems solved by technology

[0002] The special-shaped row of fixed-arc contacts is the key part of the large-scale frame-type "ACB" dual power switch designed by General Electric Company of the United States. The original processing technology of this product is: cutting material - milling side - milling bevel - milling 90 degree right angle - milling step - milling bevel on both sides - milling 3-6.4 groove - surface grinding treatment; Large, the roughness of the contact surface is difficult to ensure, which affects the electrical conductivity, and the electrical conductivity required by the product is greater than or equal to 60. Usually, the electrical conductivity of pure electrolytic copper can only be greater than or equal to 57. After the final assembly, it is found that the electrical conductivity of the overall machined parts is poor. High resistivity, rough surface and low surface hardness affect the function of the whole switch

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  • Machining method for constant-arc contact special-shaped bank
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Embodiment Construction

[0009] The following structural drawings further describe the present invention:

[0010] A processing method for a special-shaped row of fixed-arc contacts, comprising the following steps: smelting - mold hot extrusion semi-forming - mold cold extrusion forming and surface hardening - cutting material - milling both sides - milling 3 slots. The smelting process described is as follows: the smelting furnace is heated up to 1100°C, and electrolytic copper and charcoal are put in for deoxidation, and 0.3 ~ 1.2% sterling silver, add 0.05 after another hour ~ 0.5% rare earth, the furnace temperature rises to 1125 ℃ for 2 hours before pouring copper rods. In actual implementation, due to the specific shape of the product, it is difficult to extrude and form, so the design adopts the shape of the product to move up the center of the mold, so that the positive extrusion force of the extruder mainly acts on the side with a large amount of deformation; an auxiliary oil cylinder is add...

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Abstract

The invention provides a machining method for a constant-arc contact special-shaped bank. The machining method comprises the following steps of smelting-die hot extrusion half forming-die cold extrusion forming and surface hardening-material cutting-milling of the two sides-milling of three grooves. According to the machining method, the electric conductivity is improved by about 15%; the surface hardness is improved by 30%; the work efficiency is improved by ten times; the surface roughness is reduced; the machining error is reduced; the product properties are guaranteed.

Description

technical field [0001] The invention relates to a processing method for a special-shaped row of fixed-arc contacts in a large frame type "ACB" double power switch. Background technique [0002] The special-shaped row of fixed-arc contacts is the key part of the large-scale frame-type "ACB" dual power switch designed by General Electric Company of the United States. The original processing technology of this product is: cutting material - milling side - milling bevel - milling 90 degree right angle - milling step - milling bevel on both sides - milling 3-6.4 groove - surface grinding treatment; Large, the roughness of the contact surface is difficult to ensure, which affects the electrical conductivity, and the electrical conductivity required by the product is greater than or equal to 60. Usually, the electrical conductivity of pure electrolytic copper can only be greater than or equal to 57. After the final assembly, it is found that the electrical conductivity of the ove...

Claims

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Application Information

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IPC IPC(8): B23P15/00C22C1/02C22C9/00
CPCB23P15/00C22C1/02C22C9/00
Inventor 宋和明
Owner 宋和明