The contact arm product is shown in Figure 1, and the material is T2 Y. This product is a key component of VS1 indoor high voltage vacuum circuit breaker. It has a considerable market share in China's electrical products. Switch-type conductive products, electrical performance in addition to design factors, mainly depends on the material and processing quality of the contact.
1. Process design (1) Domestic contact arm production enterprise adopts CNC lathe processing, raw material selection (52×19×162) mm thick arm copper tube, single piece processing time total 2h, single piece material 2.625kg, surface roughness The value Ra=1.6μm. If cold extrusion processing is used, the extruded product is as shown in Fig. 2. When the single piece is processed, it is reduced to 0.5h, the material used is only 1.54kg, and the material is 1.11kg. Therefore, it was decided to adopt a cold extrusion process.
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