最近,机械加工难切削材料时对零件进行预热切削的方法已得到广泛推广。预热机械加工能提高生产率,延长刀具寿命。被加工零件温度必须根据实际切削温度及刀具的工作性能来选择。在热源(等离子弧)集中的情况下,切削层受热循环作用骤冷骤热,复杂的物理机械过程出现很强的热 Recently, the method of preheating and cutting a part when machining hard cutting materials has been widely promoted. Preheating machining can increase productivity and extend tool life. The temperature of the part to be machined must be selected according to the actual cutting temperature and the working performance of the tool. In the case of a concentrated heat source (plasma arc), the cutting layer is subjected to a rapid heating and quenching effect due to thermal cycling, and a complex physical and mechanical process presents a strong heat