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:
Aug. 09, 2016
Filed:
Mar. 28, 2011
Applicant:
Masanori Kobayashi, Kanagawa, JP;
Inventor:
Masanori Kobayashi, Kanagawa, JP;
Assignee:
TOPRE CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21D 22/02 (2006.01); B21D 22/20 (2006.01); B21D 37/16 (2006.01); C21D 1/18 (2006.01); C21D 1/673 (2006.01); C21D 7/13 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01);
U.S. Cl.
CPC ...
B21D 22/02 (2013.01); B21D 22/208 (2013.01); B21D 37/16 (2013.01); C21D 1/18 (2013.01); C21D 1/673 (2013.01); C21D 8/0447 (2013.01); C21D 9/46 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01);
Abstract
A hardenable steel sheet is treated with press-forming by means of a die. The method is comprised of: heating the steel sheet to a temperature of an Acpoint or higher; carrying out a primary press on the heated steel sheet so as to give a local strain to a limited part of the steel sheet; keeping the steel sheet in a state apart from the die shortly after the primary press; and carrying out a press on the steel sheet kept in the state and retain the steel sheet in close contact with the die.