Abstract In this paper, the analysis of discharge channel characteristics from the view of plasma flow and heat transfer in ultrasonic vibration (USV) and magnetic field (MF) assisted low speed wire electrical discharging machine (WEDM-LS) process is proposed. According to the particle orbit theory, the motion equations of multi electrons are modified by Monte Carlo collision model. The study of discharge channel parameters reveals that the spatial shape of channel is changed and the length of channel path is increased when additional magnetic field is applied to the discharge machining, thus causing the channel current fluctuation. The simulation results of electrons motion process in magnetic field indicates that the time from cathode to anode increase by 15.38% and the diffusion of electrons reduce by 5%. The electron distribution on anode surface is relatively homogeneous after the completion of the discharge. The experimental results indicate that under the influence of magnetic field, the peak current in discharge channel increases obviously, the material removal rate (MRR) increases by 48.8% on average, and the number of micro cracks on machined surface decreases significantly.

中文翻译：

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基于等离子流和传热的USV-MF复合辅助WEDM-LS放电通道特性分析

摘要 本文提出了从超声波振动（USV）和磁场（MF）辅助低速线切割机（WEDM-LS）工艺中等离子体流动和传热的角度分析放电通道特性。根据粒子轨道理论，采用蒙特卡罗碰撞模型修正多电子运动方程。对放电通道参数的研究表明，在放电加工中施加附加磁场时，通道的空间形状发生变化，通道路径长度增加，从而引起通道电流波动。磁场中电子运动过程的模拟结果表明，从阴极到阳极的时间增加了15.38%，电子的扩散减少了5%。放电完成后阳极表面的电子分布比较均匀。实验结果表明，在磁场作用下，放电通道峰值电流明显增大，材料去除率（MRR）平均提高48.8%，加工表面微裂纹数量明显减少。