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山西读者郑小刚来信,希望介绍有关不锈钢内螺纹的冷挤加工工艺。对不锈钢进行机械加工,其表面冷作硬化严重,材料的韧性和强度高,易产生刀瘤,切削温度高,导热性差。因此,切削力大,刀具耐用度降低。用普通丝锥在不锈钢零件上攻丝是很困难的,丝锥很容易磨损或折断。挤压丝锥是一种新型工具,它使金属产生塑性变形,冷挤成形内螺纹。由于金属纤维在挤压
Zheng Xiaogang, a reader from Shanxi, wrote about the cold extrusion process of stainless steel internal thread. The stainless steel for machining, the surface of the hardened hard, material toughness and high strength, easy to produce tumor, cutting temperature, poor thermal conductivity. As a result, cutting forces are large and tool durability is reduced. It is very difficult to tap the stainless steel parts with ordinary tap, and the tap is easy to wear or break. Squeeze tap is a new type of tool that plastically deforms metal and cold-extrude internal threads. Due to the metal fiber in the extrusion