The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2001
Filed:
Oct. 14, 1999
Kazuo Akagi, Shimonoseki, JP;
Tomohisa Akiyoshi, Shimonoseki, JP;
Yoshimitu Nakashima, Shimonoseki, JP;
Nissin Unyu Kogyo Co., Ltd., Shimonoseki, JP;
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.