放電加工における加工開始時の放電安定性の改善に関する研究（加工電圧の検出方法の違いが放電の安定性と極間距離に及ぼす影響）

概要

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In this study, the conventional power supply for EDM machines which superimposes high voltage on the detected working voltage (inner superimposed) was compared with a power supply which superimposes high voltage externally so the superimposed voltage is not added to the detected working voltage (outer superimposed), in the aim to investigate the differences between the two superimposed voltage methods and the effects of servo voltage on the stability of discharge. As a result, differences were seen between the two methods up to 100 seconds after the start of EDM. With inner superimposed voltage, it took more than 100 seconds after the start of EDM to reach the final general discharge frequency, and for the ratio of abnormal discharge frequency to become more or less 0%. With outer superimposed voltage, the final general discharge frequency was reached six seconds after the start of EDM. At this point, the ratio of abnormal discharge frequency was also more or less 0%. The same tendency was seen regardless of the servo voltage value. In addition, 10 seconds after the start of EDM, the frontal gap distance was found to be three times wider with outer superimposed voltage compared to inner superimposed voltage. These results confirm that outer superimposed voltage improves the stability of discharge after the start of EDM.
一般社団法人日本機械学会の論文