1.前言作为可弥补通常采用的切削加工、磨削加工等机械加工法之弱点的新的加工方法——电加工法有了飞跃的进展。现在,它已从特殊加工法的范畴之中脱颖而出,作为独立的加工法对产业界作出了很大贡献,并得到了很高的评价。在其当初作为特殊加工法出现时,由于只是用它加工其它方法不能加工或加工非常困难的工件,因此在加工缺陷方面,与常规加工法相比,即使有缺欠,在一定程度上也是可以允 1. Introduction As a new processing method that can make up for the weaknesses of the commonly used machining methods such as cutting, grinding and other machining methods, the electromachining method has made leaps and bounds. It has now stood out from the category of special processing methods, has made a significant contribution to the industry as a stand-alone processing method, and received high marks. When it was originally used as a special machining method, since it is impossible to process or process very difficult workpieces only by machining it by other methods, it is acceptable to some extent to process the defects in comparison with the conventional machining method even if there is a defect