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Abstract

A method for mirror processing of an external surface of a long-sized metal piece, by which the external surface is mirror-polished with precision and high efficiency without a surface defect or so that stable dimensional accuracy, such as a roundness and improvement of yield in production, can be obtained. The method comprises the steps of clamping both ends of a long-sized metal piece, applying a positive electrical charge and rotating the metal piece, and moving the long-sized metal in the axial direction through an electrolytic integrated polishing apparatus for processing the external surface of a long-sized metal piece into a mirror surface. The electrolytic integrated polishing apparatus includes a plurality of grindstones pressed onto the long-sized metal piece from the opposite directions or from outside to the rotation axis radially at a constant pressure, and negative electrodes disposed so that each of the grindstones is disposed between the electrodes in the circumferential direction so as to integrate abrasion of the long-sized metal piece by grindstones and concentration elution by an electrolyte for mirror processing of the external surface of the long-sized metal piece.

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First Claim