High-voltage electric appliance contact finger part cold extrusion forming technology and die thereof

Abstract

The invention discloses a high-voltage electric appliance contact finger part cold extrusion forming technology and a die thereof. The high-voltage electric appliance contact finger part cold extrusion forming technology comprises the steps of material selection and cutting, annealing treatment, phosphating treatment, cold extrusion forming, hot isostatic pressing treatment, edge cutting and tumbling. According to the die of the high-voltage electric appliance contact finger part cold extrusion forming technology, a female die is arranged in a stress outer ring, a male die outer ring is arranged at the upper end of the female die, a male die is arranged in the male die outer ring, a cavity is formed between the female die and the male die, and the cavity is axisymmetric and is a two-chamber cavity in the axisymmetric communication mode. According to the technology and the die, annealing treatment, cold extrusion forming and hot isostatic pressing treatment are combined, so that the metal transfer forming difficulty is reduced; meanwhile, formation of burrs is reduced to a great extent through the axisymmetric cavity and a rotatable inclined punch, the lug manufacturing position is filled fully, and the part yield is high.

Description

technical field [0001] The invention relates to the technical field of contact finger parts technology application, in particular to a cold extrusion forming process and mold for contact finger parts of high-voltage electrical appliances. Background technique [0002] The contact finger parts of high-voltage electrical appliances are the key core parts of high- and medium-voltage electrical appliances. The shape of the finger parts is generally more complicated. The use of milling division, CNC machining and other processes will result in low material utilization and large waste. Therefore, the batch of contact finger parts The production generally uses rods or plates for cold extrusion production. This production process makes the material utilization rate high and the waste is less. However, the technical nature of the cold extrusion process itself leads to high metal fluidity during processing, which will affect the formation of finger parts. Some difficulties are caused,...

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Problems solved by technology

[0002] The contact finger parts of high-voltage electrical appliances are the key core parts of high- and medium-voltage electrical appliances. The shape of the finger parts is generally more complicated. The use of milling division, CNC machining and other processes will result in low material utilization and large waste. Therefore, the batch of contact finger parts The production generally uses rods or plates for cold extrusion production. This production process makes the material utilization rate high and the waste is less. However, the technical nature of the cold extrusion process itself leads to high metal fluidity during processing, which will affect the formation of finger parts. Some difficulties are caused, that is, the existing cold extrusion forming process of finger parts makes it difficult for the metal at one end of the material to transfer through the bending part in the middle, making it difficult to completely fill the other end, and the parts tend to form larger flying parts. The edge, the filling of the ear is not full

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