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. 25, 2014
Filed:
May. 12, 2009
Takaaki Fukushi, Tokyo, JP;
Isao Anai, Tokyo, JP;
Yasushi Yamamoto, Tokyo, JP;
Hideyuki Nakamura, Tokyo, JP;
Yoshiaki Kadoma, Toyota, JP;
Naoki Hori, Toyota, JP;
Takaaki Fukushi, Tokyo, JP;
Isao Anai, Tokyo, JP;
Yasushi Yamamoto, Tokyo, JP;
Hideyuki Nakamura, Tokyo, JP;
Yoshiaki Kadoma, Toyota, JP;
Naoki Hori, Toyota, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
A method of press-forming a tubular part having a cross section of an irregular shape crushes a steel tube between an upper die and a lower die in order to form a V-shaped cross section. When the curvature radius of a tip of the upper die is defined as R, the curvature radius of a bottom portion of the lower die corresponding to the tip of the upper die is defined as R, and the wall thickness of the steel tube is defined as t; R, R, and t satisfy R+2t=Rand 1.5t≦R≦3t.