After 60 years of EDM the discharge process remains still disputed
After 60 years of EDM the discharge process remains still disputed
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DOI：
10.1016/j.jmatprotec.2003.11.060
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发表时间：
2004-06-10
影响因子：
6.3
通讯作者：
Schumacher, BA
中科院分区：
文献类型：
--
作者：
Schumacher, BA
当应用EDM时，在肮脏的充满液体的间隙中的放电的点燃大多被解释为离子作用，其与空气中放电的物理研究（Lichtenberg图）或真空中放电的物理研究（无线电管）以及绝缘碳氢化合物液体的突破强度的研究所发现的相同。然而，在真实的电火花加工中，伺服控制间隙的状态与这种情况有很大的不同。作者规定点火的电气放电的蒸发粒子桥在差距通过过大的电流。放电的后续点由从电极移除的剩余颗粒以及来自早期放电的气泡调节。材料去除反应在点火开始时被分组在蒸发阶段中，随后在放电点处通过瞬时沸腾喷射熔融材料。差距宽度源自差距污染平均值，取决于工艺设置。(C)2004年由Elsevier B.V.出版
The ignition of electrical discharges in a dirty, liquid filled gap, when applying EDM, is mostly interpreted as ion action identical as found by physical research of discharges in air (Lichtenberg figures) or in vacuum (radio tubes) as well as with investigations on the breakthrough strength of insulating hydrocarbon liquids. The state of the servo-controlled gap in real ED-machining, however, differs very much from such condition. The author stipulates ignition of electrical discharges by the evaporation of particle bridges in the gap through excessive current. The follow-up spot of a discharge is conditioned by the remaining particles, removed from the electrodes, as well as gas bubbles from earlier discharges. The material removal reaction is grouped in an evaporation phase at start of ignition and later in the ejection of fused material by instantaneous boiling at the discharge spots. The gap width derives from the gap contamination average, depending from process settings. (C) 2004 Published by Elsevier B.V.