Research on Tool Wear in Electrochemical Machining by Electrostatic Induction Feeding Method

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  • 静電誘導給電法を用いた電解加工における工具電極消耗の研究
  • セイデンユウドウ キュウデンホウ オ モチイタ デンカイ カコウ ニ オケル コウグ デンキョク ショウモウ ノ ケンキュウ

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Abstract

 In this paper, we describe the tool wear of micro-electrochemical machining (ECM) by the electrostatic induction feeding method. When a pulse voltage is coupled to the ECM working gap, electrolytic current flows only during the rise and fall times of the rectangular pulse, thereby enabling ultrashort-pulse ECM. However, since the electrolytic current is bipolar, there is a concern that the tool electrode wear may be significant. Thus, the tool electrode wear was measured and found to be negligible in the drilling of a plate workpiece made of the same material as the tool electrode. Hence, the influence of the difference in shape between the tool electrode and the plate workpiece on the temperature of the working surface was investigated analytically and experimentally. As a result, it was found that a higher temperature rise on the tool electrode than that on the workpiece, owing to the greater resistance to heat conduction, reduced the tool wear. This result can be verified by the fact that the electrostatic capacity of the double layer may increase with temperature.

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