一、概述近几年,晶体管、可控硅脉冲电源的出现,平动加工的使用,在电火花加工型腔模具中,石墨电极被选为一种主要的工具电极。不同牌号的石墨材料在电火花加工中有较大的差异。对于不同的工件材料(如工具钢、耐热合金钢、铝等)、不同的电源种类(如脉冲发电机、晶体管、可控硅和改装后的双闸流管脉冲电源等)及不同的工艺指标(如生产率、电极损耗、光洁度等),应该选用相应牌号的石墨电极,以达到最佳加工状态。为此,美国、苏联、日本、西德和法国等在这方面已进 I. Overview In recent years, the emergence of transistors, thyristor pulse power supply, the use of translational machining, in EDM cavity mold, graphite electrode was selected as a major tool electrode. Different grades of graphite materials in EDM have greater differences. For different workpiece materials (such as tool steel, heat-resistant alloy steel, aluminum, etc.), different types of power (such as pulse generator, transistor, thyristor and modified double thyristor pulse power, etc.) and different processes Indicators (such as productivity, electrode loss, smoothness, etc.), should be the appropriate choice of graphite electrode, in order to achieve the best processing conditions. To this end, the United States, the Soviet Union, Japan, West Germany and France have already entered this area