DISCHARGE CHANNEL GROWTH IN MICRO EDM OF HIGH FREQUENCY PULSE  

高频脉冲微细电火花加工放电通道形成过程(英文)

作　　者：刘宇[1] 王津[2] 王元刚[3] 赵福令[2] 

机构地区：[1]大连交通大学机械工程学院 [2]大连理工大学精密与特种加工教育部重点实验室 [3]大连大学机械工程学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2011年第4期353-361,共9页南京航空航天大学学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(50635040)~~

摘　　要：The influences of intense magnetic pinch effect caused by electromagnetic field with high frequency on discharge channel expansion and plasma configuration change are discussed. The change of Lorentz force exerting on charged particles in discharge channel is calculated under the electromagnetic field with high frequency. Through the theoretical analysis and experimental study, the forming process of discharge channel is conjectured. And it is considered that the changes of discharge channel, such as the decrease of diameter and increase of energy density, coming from the intense magnetic pinch effect in high frequency electromagnetic field, are the main reasons for a series of special phenomena on the machined surface in micro EDM.研究了微细电火花加工中,高频电磁场形成的强磁力箍缩效应对加工过程中放电通道扩张及放电通道位形变化的影响。计算了高频电磁场作用下,放电通道中带电粒子所受洛伦兹力的变化情况。通过理论分析与实验研究,推测了放电通道的形成过程,认为在高频电磁场中,放电通道在强磁力箍缩效应作用下产生的通道直径减小、能量密度增大等变化是微细电火花加工表面出现的一系列特殊现象的重要原因。

关 键 词：micro EDM discharge channel high frequency electromagnetic field magnetic pinch effect discharge crater 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]