一、引言模具加工一直是农、轻、重及国防等部门长期以来存在的带有普遍性的问题。晶体管及可控硅脉冲电源的出现,由于能实现电极低损耗,因而便大量地采用电火花加工方法加工型腔模具。为了得到一个能够实用的型腔模具,一般需经三个阶段:制作电极;型腔预加工及电火花加工;手工精修,使型腔表面达到所需精度及光洁度。采用电火花方法加工型腔时,一般是先 I. Introduction Mold processing has always been a common problem existing in agriculture, light weight, heavy industry and national defense departments for a long time. Transistor and SCR pulse power supply, due to the electrode can achieve low loss, so a large number of EDM processing cavity mold. In order to get a practical cavity mold, generally need to go through three stages: the production of electrodes; cavity pre-processing and EDM; manual finishing, the cavity surface to achieve the required accuracy and finish. When using EDM processing cavity, the general is the first