Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM
Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM
复制标题
微细电火花单脉冲放电特性研究
DOI：
10.3390/mi11010055
复制
发表时间：
2020-01-01
期刊：
影响因子：
3.4
通讯作者：
Yang, Fazhan
中科院分区：
文献类型：
--
作者：
Liu, Qingyu;Zhang, Qinhe;Yang, Fazhan
为进一步研究微细电火花加工的放电特性和加工机理，在单脉冲放电实验的基础上，探讨了放电能量和放电坑尺寸随实际放电持续时间的变化规律。根据放电等离子体通道中电子和离子的运动特性，分析了微细电火花加工的极性效应。结果表明，微细电火花加工的放电电流和放电电压与放电宽度和开路电压无关。短脉冲放电的能量利用率相对较高，随着放电持续时间的增加，能量利用率逐渐降低。即使正离子的质量远大于电子的质量，正离子轰击电极表面时的动能仍然小于电子。电子的加速度和速度都很高，在相同的时间内，电子轰击正极表面的次数是正离子轰击负极表面的600倍以上。
To further study the discharge characteristics and machining mechanism of micro-electrical discharge machining (micro-EDM), the variation trends of the discharge energy and discharge crater size with actual discharge duration are discussed based on single-pulse experiments. The polarity effect of micro-EDM was analyzed according to the motion characteristics of electrons and ions in the discharge plasma channel. The results show that the discharge current and voltage of micro-EDM were independent of the discharge width and open-circuit voltage. The energy utilization rate of the short-pulse discharge was relatively high, and the energy utilization rate decreased gradually as the discharge duration increased. Even if the mass of the positive ion was much larger than that of the electron, the kinetic energy of the positive ion was still less than that of the electron when bombarding the surface of the electrode. The acceleration and speed of electrons were very high, and the number of times that electrons bombarded the surface of positive electrode was more than 600 times that of positive ions bombarding the surface of the negative electrode during the same time.