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:
Nov. 29, 2016
Filed:
Dec. 27, 2013
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A press-forming method includes: a step of forming a first cup-shaped workpiece (B); a step of moving an axial pressing punch () relatively to a die () to abut on a cup opening end (B) of a cup sidewall portion (B), and while constraining the cup opening end (B), moving a second-stage forming punch () relatively to the die () to insert the second-stage forming punch () into a second die hole portion (), and pushing a part of the first cup-shaped workpiece into the second die hole portion () through a second die shoulder portion (), to thereby reduce the cup sidewall portion (B) in diameter and thicken the cup sidewall portion (B); and a step of, in a state of the constraint of the cup opening end (B) by the axial pressing punch () being released, moving the second-stage forming punch () relatively to the die () and further pushing the first cup-shaped workpiece deeper in the second die hole portion (), to thereby form a second cup-shaped workpiece smaller in diameter than the first cup-shaped workpiece.