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. 29, 2017
Filed:
Apr. 15, 2014
Applicant:
Nisshin Steel Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
Nisshin Steel Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B21D 22/30 (2006.01);
U.S. Cl.
CPC ...
B21D 22/30 (2013.01);
Abstract
An ironing mold according to the present invention is provided with a punch, and a die which forms a pushing hole with respect to the punch. When the skewness Rsk of a surface treated metal plate is less than −0.6 and no less than −1.3, then the curvature radius of a shoulder portion of the die and a clearance between a radius end and the punch are determined such that Y, which is expressed by {(t−c)/t}×100, and X, which is expressed by r/t, satisfy 0<Y≦18.7X−6.1, X satisfies X≧0.6 and r satisfies r≦0.5 h.