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:
Oct. 18, 2016
Filed:
Dec. 26, 2013
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
An inner punch (), an outer punch (), and a die () are disposed on the same center axis (). The outer punch () is disposed so as to be apart from the inner punch () in a radial direction perpendicular to the center axis () by a first space Swhich is larger than a plate thickness T of a cup longitudinal wall portion (A). Further, an inner peripheral surface of the outer punch () has, on its die () side, a punch shoulder R portion (A) widening as it goes toward the die (). A cup bottom portion (A) is sandwiched by the inner punch () and the die () while an outer peripheral surface of the inner punch () and an inner peripheral surface of the cup longitudinal wall portion (A) are apart from each other by a second space S, and drawing to radially reduce the cup longitudinal wall portion (A) is performed by pushing the cup longitudinal wall portion (A) toward the outer peripheral surface of the inner punch () by the outer punch () while making the outer punch () abut on the cup longitudinal wall portion (A) from the punch shoulder portion (A), whereby a surplus material is made to flow into a cup shoulder portion (A) to thicken the cup shoulder portion (A).