| 摘要 |
PURPOSE:To control an electrode performing its good follow-up motion and to easily polish a three-dimensional curved surface, by supporting a polishing unit tiltably moving by a universal joint and providing an insulating material made spacer, which comes into slide contact with surfaces of a workpiece, pressing the polishing unit to the workpiece. CONSTITUTION:A polishing unit 12, which is vertically movably supported with a corner drill 13 and pressed to surfaces of a workpiece by the gravity, supports a holder 17 tiltably moving by a universal joint 16 to be automatically tilted in accordance with a curve, and a ceramics made spacer 18 comes into contact with the surface of the workpiece. The polishing unit 12 is driven reciprocating by a robot arm and rotating by the corner drill 13, and the spacer 18, coming into contact with the surface of the workpiece, rotates with a rotary shaft 15 serving as the center. The polishing unit, which removes a passive state film in a protrusive part of the surface by polishing to be melted by electrolytic action, flatly smooths the surface by exposing the metallic surface of the workpiece in an electrolyte and opposing a negative electrode 19 to the metal exposed part of a positive electrode.
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