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:
Apr. 13, 1999
Filed:
Oct. 02, 1997
Akifumi Nishio, Nagoya, JP;
Carine Anne-Marie Dewitte, Ottignies, BE;
Jeffrey Philip Pattimore, Baudour, BE;
NGK Insulators, Ltd., , JP;
NGK Ceramic Europe S.A., , BE;
Abstract
A process for chucking and machining an elongated cylindrical article made of a ceramic material according to the present invention, comprises the steps of: (1) chucking the elongated cylindrical ceramic article between chuck heads at longitudinally opposite end portions of said ceramic article; (2) holding the elongated cylindrical article between the chuck heads under such a low chucking pressure as allowing the ceramic article to slip inside a driven side chuck head while being kept inside the chuck heads at the opposite end portions, and slipping the ceramic article inside the chuck heads for a given time under rotation of a driving chuck head so that any positional deviation between the location of a center axis passing centers of of the chuck heads and an axis of the ceramic article may be removed due to a self aligning centrifugal action of the ceramic article; (3) raising the chucking pressure of the chuck heads to such a level as required for machining the ceramic article; and (4) then machining a surface of the ceramic article by a machining tool.