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:
May. 23, 2006
Filed:
Jan. 28, 2004
Applicants:
Kuniharu Teshima, Kariya, JP;
Kazuhiro Mitsukawa, Bisai, JP;
Shoichi Takenouchi, Toyota, JP;
Inventors:
Assignee:
DENSO Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21B 21/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A die rollcomprises a core partwhich is formed of an elastic material and faces a punch partof a punch rollThe core partpresses a bottom portionof a drawn portionof a metal materialand is separate from a surrounding die partand is provided with a spaceat the whole outer periphery of the core partIn accordance with the above configuration, swelling is suppressed at the bottom portionof the drawn portionand production of large wrinkles, which is a reason for folds, can be prevented by increase of pressing areas for preventing wrinkles at both sides of the drawn portion.