Synchronized Observation of Machining Phenomena and Discharge Waveform in EDM of Transparent Insulator

Ryosuke Sato, D. Hanaoka, Masahiro Yoshida
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Abstract

(cid:3) The assisting electrode method has enabled the EDM of insulating materials. However, there is a need to change the machining conditions, otherwise the stability of EDM drops. To solve this problem, it is important to clarify the mechanism of EDM for insulating materials. We built a measurement system that enables the synchronized observation of machining phenomena and the discharge waveform. The observation clarified the two facts. The main role of a long pulse discharge is to form a conductive layer on the workpiece surface. Machining of the insulating material progresses with the concentration of normal discharge in the same area after a long pulse discharge. But, when the amount of pyrolytic carbon is large, the machining accuracy will deteriorate due to concentration of the discharge generated. Thus, the discharge conditions were changed according to the amount of pyrolytic carbon generated, resulting in the improvement of the machined shape accuracy.
透明绝缘子电火花加工过程中加工现象与放电波形的同步观察
辅助电极法使绝缘材料的电火花加工成为可能。但是,需要改变加工条件,否则电火花加工的稳定性会下降。为了解决这一问题,阐明绝缘材料电火花加工的机理是十分重要的。我们建立了一个测量系统,可以同步观察加工现象和放电波形。观察结果澄清了两个事实。长脉冲放电的主要作用是在工件表面形成导电层。绝缘材料的加工是在长脉冲放电后同一区域内正常放电集中的情况下进行的。但是,当热解碳量较大时,由于产生的放电浓度较大,会使加工精度下降。因此,根据产生的热解碳量改变放电条件,从而提高了加工形状精度。
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