高応答・多自由度磁気浮上アクチュエータを用いた放電穴加工（穴加工速度における電極運動の方向，振幅および周波数の影響）

概要

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This paper describes hole electrical discharge machining (EDM) using a cylindrical electrode driven by a high response and multi degrees of freedom (DOF) controlled magnetically-levitated (maglev) actuator. To avoid abnormal electrical discharge and achieve high speed hole EDM, several combinations of electrode motions such as high speed and high precision axial positioning to keep a gap voltage, jump motion, orbital motion and high frequency axial vibration of electrode (dither) for facilitating debris ejection were tested. Experimental results showed that the combination of the high speed positioning, jump and orbital motions of the electrode was effective for improving the speed of hole EDM. Finally, frequencies and diameters of the orbital motions were surveyed in order to improve the machining speed.