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Although roughing, semi-finishing and finishing of stainless-iron materials on general-purpose machine tools is not too difficult. Imidlertid, how to solve the problems of high cutting force, high temperature, serious tool wear and low durability, poor surface quality and low productivity in stainless steel cutting on a high-productivity special automatic lathe. It is difficult to meet the requirements of the drawing in one turning operation. In the process of CNC machining martensitic stainless steel materials in our factory: from the selection of tool materials, the selection of tool geometry and structure; Selection of cutting amount; feed state of blank material; Repeated tests have been carried out on the selection of lubricants and coolants, and certain successful experiences have been obtained. Take 3Cr13 stainless iron as an example.