关键词: 电火花加工, 多孔质电极, 内冲液, 等离子体通道

Abstract:

The influences of  distributed inner-flushing  on performance of  porous-electrode  EDM were studied by a series of experiments. Experimental results show that the concentration of debris within discharge gap is able  to be reduced adequately by using distributed inner-flushing,such that the tool lifting and orbiting are able to be substituted.Furthermore,a tiny pulse interval can be applied and a high  material removal rate(MRR) is able to be achieved due to the high duty cycle.Experimental results also show that as the flushing flux increases,the MRR curve demonstrates a two peak-value characteristics,as a result of the dual roles of flushing on both debris evacuation and plasma channel disturbance.By means of acquiring gap voltage  and analyzing the proportion of long-term open-circuit  period to the whole machining time,it  is proved that,as the flux increases,the debris concentration is reduced to a ideal level firstly, and then a ideal level of plasma channel disturbance is achieved.

Key words: electrical , discharge machining(EDM);porous electrode;inner-flushing;plasma channel