为了模拟微细电火花放电通道扩展的过程,对放电等离子体通道进行了深入研究,建立了一个适用于微细电火花放电加工的等离子体扩展模型。基于介质击穿机理和磁流体力学的相关知识,模型综合考虑了等离子体扩展过程中的粘性力、表面张力及磁场箍缩力等各个作用力,使扩展过程更接近于真实。最后,通过比较微细电火花rC单脉冲放电的模型计算直径与实际加工直径,验证了等离子体扩展模型的正确性。To simulate the process of micro-EDM discharge channel expansion,discharge plasma channel has been studied.A suitable plasma expansion model of micro-EDM has been established.Based on the dielectric breakdown mechanism and relevant knowledge of MHD,the various forces such as viscous force,surface tension and magnetic pinch force,in the process of plasma expansion has been considered,which makes the expansion process closer to the real.Finally,comparing the calculation diameter of micro-EDM RC single pulse discharge model with the actual machining diameter,the correctness of plasma expansion model is verified
