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)

  • 吉田 政弘
    東京都立産業技術高等専門学校 ものづくり工学科 品川キャンパス
  • 上田 大斗
    東京大学 工学系研究科 精密工学専攻
  • 名古屋 寛
    東京都立産業技術高等専門学校 専攻科 創造機械工学専攻 品川キャンパス
  • 北村 友彦
    出光興産(株)営業研究所 加工油グループ

書誌事項

タイトル別名
  • Study on Improvement of Stability of Discharge When Start of Machining in EDM (Influence of Difference of Detection Method for Working Voltage on Stability of Discharge and Frontal Gap Distance)

抄録

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.

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