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. 05, 2016
Filed:
Oct. 30, 2008
Weidong Xue, Chigaski, JP;
Weidong Xue, Chigaski, JP;
TOPY KOGYO KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The present invention relates to a method for heat treatment of a columnar work. In order to provide the method for heat treatment of a columnar work being able to attain a high productivity, a reduction of cost, and an improvement of quality, as compared with the prior art, the method for heat treatment of a columnar work of the present invention includes a quench-hardening step (S) and a tempering step (S) being carried out after the quench-hardening step (S), the quench-hardening step (S) includes a first quench-hardening step (S) and a second quench-hardening step (S) being carried out after the first quench-hardening step (S), the entire region of the columnar work () from an outer circumferential surface () to a core thereof (), or a partial region thereof, is heated up to a temperature not lower than a transformation temperature Ac, and then, the work is quench-hardened.