| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrochemical machining method that can precisely and efficiently machine a deformed hole with different cross-sectional inside contour dimensions along axial positions. SOLUTION: The electrochemical machining method for a deformed hole leads electrolyte in an electrode in the form of a hollow pipe comprising a core pipe of conductive material whose outer surface has a coating of insulating material and sprays the electrolyte from the point of the electrode, and applies voltage between the electrode and a workpiece of metallic material via the electrolyte, while moving the electrode axially relatively to the workpiece, to thereby machine a hole with different cross-sectional inside contour dimensions along axial places on the electrode. The first step machines a hole with a uniform cross-sectional inside contour dimension along axial places on the electrode, and a subsequent step uses an electrode whose outer surface coating is partly removed to expose the surface of the core pipe of conductive material, to machine part of the hole machined in the preceding step.
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