模具钢高速硬铣削加工表面完整性及其耐磨性研究

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

随着刀具制备技术与高端机床的不断发展,高速硬切削技术在模具制造行业的应用可行性逐渐提高。鉴于冷作模具在服役过程对耐磨性的要求高的特点,本文以淬硬模具钢为研究对象,研究高速铣削时工件表面完整性及其耐磨性关于切削速度的影响规律。结果表明,表面粗糙度随主轴转速的提高而降低;表面加工硬化显著,存在残余压应力,且二者均随主轴转速的提高而降低;表面耐磨性是表面硬度、表面残余应力和表面缺陷等多因素协同作用下的结果,随主轴转速的提高呈先增强后减弱的规律。该结果可用于指导模具钢铣削加工时切削参数的选择,有助于实现模具钢高性能制造。

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.