Investigation of Plasma Volt-ampere Characteristics and Gap Modeling of EDM

doi:10.3901/JME.2019.05.232

Abstract

Abstract: During electric discharge machining (EDM), it is difficult for to determine the gap between tool electrode and workpiece, the large gap results in half of discharge machining, and small gap results in short circuit or faults such as surface burning of workpiece. The reasonable range and model of the gap between electrodes during discharge process is the key. As N type single crystal silicon for example, the variation trend of V-A characteristic curve of the plasma in discharge channel after the dielectric between electrodes breaks down are analyzed, theoretically demonstrates that the discharge channel is equivalent to a pure resistance model. A mathematic model between equivalent electrical resistivity and gap between electrodes is obtained through least square fitting. The model of gap between electrodes and voltage and current is tested based on experiment by combining 3σ test, the experiment result shows that the established gap model between electrodes can describe the gap between electrodes during actual machining process.

Key words: EDM, interelectrode gap, modeling, volt-ampere characteristics

CLC Number:

TG661

LI Shujuan, XIN Bin, YANG Yuxiang, LU Xiong, LI Yan, JIANG Bailing, JIA Zhen, LI Yuxi. Investigation of Plasma Volt-ampere Characteristics and Gap Modeling of EDM[J]. Journal of Mechanical Engineering, 2019, 55(5): 232-240.

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