| 摘要 |
PURPOSE:To make good the surface quality of a workpiece by applying a current density of 2/3 to the preceding work stage compared with the succeeding work stage, and feeding a pulse current of high density to the preceding work stage. CONSTITUTION:In the preceding work stage, the pulse current of the predetermined current density is supplied between a workpiece 2 and an electrode 4, thereby eluting the element of a workpiece surface 2a. Furthermore, the pulse current of a density higher than said pulse current is supplied, and a film made of an electrolytic product and the like produced on the workpiece surface 2a is thereby peeled off and removed. Thereafter, when a processed depth reaches the predetermined value, the pulse current of a density exceeding 2/3 the density in the preceding work stage is supplied and finish processing is thereby completed.
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