Research on surface integrity and wear resistance of high speed hard milled surface of die steel

With the continuous development of tool preparation technology and high-end machine tools, the application feasibility of high-speed hard cutting technology in die manufacturing industry is gradually improved. In view of the high requirement of wear resistance in the service process of cold working die, this paper takes hardened die steel as the research object to study the relationship among surface integrity, wear resistance and cutting speed. The results show that the surface roughness decreases with the increase of spindle speed. The surface work hardening phenomenon and residual compressive stressis significant and both decrease with the increase of spindle speed. The surface wear resistance is the result of the synergyeffect of surface hardness, surface residual stress, surface defects and other factors, which first increases and then decreases with the increase of spindle speed. The results can be used to guide the selection of cutting parameters in thehigh speed milling process of die steel, and help to realize the high-performance manufacturing of die steel.