摘要
电火花腐蚀的微观过程是电磁力、热动力以及流体动力等综合作用的过程。电火花加工中电流在电极和工件中流动时存在趋肤效应,流经电极端面和工件表面的电流在放电通道还会产生电磁场,同时放电时两极间电压在放电通道形成电场;因此运动粒子在通道中运动会在电场和磁场作用下发生改变,进而影响最终电加工特性。通过理论分析并进行相应的计算确定放电时通道内的电磁场,来分析该电磁场对形成放电通道的等离子体运动轨迹的影响,进而来研究放电加工时放电通道内的电磁场对加工机理的影响,并通过实验验证计算模型,实验结果和计算模型非常接近。
The micro-process of erosion in electrical discharge machining （EDM） is the process of comprehensive effect of electromagnetic force, thermal dynamic, fluid power and etc. There will generate skin effect when the current flows through the surface of electrode or workpiece; therefore, the magnetic field should be generated in discharge channel as well. Moreover, the electrical field is exerted on the discharge channel, and then the trace of charged particles will be changed due to magnetic and electrical field, so do machining characteristics. Theoretical analysis of magnetic field caused by skin effect was conducted so as to decide the shapes of discharge channel, which can change the trace of the plasma Furthermore, the final machining characteristics were studied based on the machining principles of EDM. Finally, the model was verified by experiments, and results showed that it agreed well with the practical experiments.
出处
《机械设计与制造》
北大核心
2015年第2期4-7,共4页
Machinery Design & Manufacture
基金
宁夏自然科学基金资助项目(NZ12159)
关键词
趋肤效应
电磁场
电火花加工
加工特性
Skin Effect
Electrical Magnetic Field
EDM
Machining Characteristics
作者简介
雍耀维，（1980－），男，宁夏人，博士在读，副教授，主要研究方向：特种加工及难加工材料；
郭常宁，（1960－），男，贵州人，博士，副教授，主要研究方向：特种加工技术
