本文讨论了利用电火花放电对模具钢进行表面硬化的研究试验结果,研究了电火花放电时电容量与增厚的对比关系;放电硬化层的抗氧化性、耐热疲劳性及耐磨性。用扫描电镜、电子探针对硬化层的结构与成分进行分析,并利用数理统计的回归分析、相关分析与离差分析方法,找出了理论分布曲线与参变量的内在联系,初步得到了电火花放电硬化在模具钢中应用的一些规律。 In this paper, the results of the research on the surface hardening of die steel by EDM are discussed. The contrast between the capacity and the thickening of EDS is studied. The oxidation resistance, thermal fatigue resistance and wear resistance of the EDL are also studied. Scanning electron microscopy and electron probe were used to analyze the structure and composition of the hardened layer. Using the statistical analysis of regression analysis, correlation analysis and dispersion analysis method, the inner relationship between the theoretical distribution curve and parameter was found out, Spark discharge hardening in the mold steel in the application of some of the laws.