为满足切割大型难削金属工件的需要,邢台冶金机械修造厂研制成功一台切割高度达750毫米的D8375型放电切割工艺试验机床。放电切割机床的构造见示意图,它的基本原理,主要是利用电流的热和化学作用。在切割加工时,被加工的工件接直流电源的(+)极,带电极接(-)极,并将两者浸泡在加工液中或在两者之间供给加工液,这样就能够在工作表面形成高电阻(1000欧姆～100欧姆)的绝缘性薄膜,当两电极瞬时接触分离时绝缘薄膜被破坏,就发生持续时间 To meet the needs of cutting large hard metal parts, Xingtai metallurgical machinery repair plant successfully developed a cutting height of 750 mm D8375 discharge cutting process test machine. The structure of the EDM machine is shown schematically. The basic principle of EDM machine is to utilize the thermal and chemical effects of current. During cutting, the workpiece to be processed is connected to the (+) pole and the (-) pole of the DC power supply, and the two are immersed in the working fluid or the working fluid is supplied therebetween so as to be able to work The surface of the formation of high resistance (1000 ohm ~ 100 ohm) of the insulating film, when the two electrodes instantaneous contact separation insulation film is destroyed, the occurrence of the duration