Observation of relationship between bubbles and discharge locations in EDM using transparent electrodes
Observation of relationship between bubbles and discharge locations in EDM using transparent electrodes
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DOI：
10.1016/j.precisioneng.2014.09.009
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发表时间：
2015-04-01
影响因子：
3.6
通讯作者：
Abe, Kohzoh
中科院分区：
文献类型：
--
作者：
Kitarnura, Tomoo;Kunieda, Masanori;Abe, Kohzoh
本文叙述了用高速摄像机从垂直于加工表面的方向通过透明电极观察电火花加工间隙现象。为了使差距可视化，使用SiC单晶作为电极材料，因为它是光学透明的和导电的。据发现，超过70%的工作表面被占据的气泡放电产生后，几百个脉冲放电从加工开始。放电不仅发生在液体中，也发生在气泡中以及液体和气泡的边界处。每种气氛单位面积放电发生的概率在液体和气泡之间的边界处最高。此外，最后一次放电产生的位于该边界处的碎片颗粒发生放电的概率最高。(C)2014爱思唯尔公司All rights reserved.
This paper describes the observation of EDM gap phenomena through a transparent electrode from the direction normal to the machining surface using a high-speed video camera. To visualize the gap, SiC single crystal was used as the electrode material since it is optically transparent and electrically conductive. It was found that more than 70% of the working surface was occupied by bubbles generated by discharge after a few hundred pulse discharges from the start of machining. Electrical discharge occurs not only in liquid but also in bubble and at the boundary between liquid and bubble. The probability of discharge occurrence per unit area of each atmosphere was highest at the boundary between liquid and bubble. Furthermore, the probability of discharge occurrence through debris particles located at this boundary generated by the last discharge was highest. (C) 2014 Elsevier Inc. All rights reserved.