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:
Jun. 19, 2018
Filed:
Oct. 29, 2014
Smk Corporation, Shigawa-Ku, Tokyo, JP;
Haruhiko Kondo, Kanagawa, JP;
Ryo Sasaki, Chiba, JP;
SMK CORPORATION, Tokyo, JP;
Abstract
A method for cold-forging a thin-walled portion by which a thin-walled portion having a set thickness is formed directly from a metal base plate having a sufficiently large thickness and an explosion-proof valve are provided. Blade side surfaces of upper and lower dies for shearing the metal base plate are set in an overlapping manner with a predetermined clearance δ therebetween. Sheared surfaces are formed with the blade side surfaces of the upper and lower dies in the metal base plate along a processing direction while leaving the set thickness t2 therebetween and the metal base plate is compressed by the overlapped portions until work-hardened to form the thin-walled portion with the horizontal width δ and the set thickness t2 between the sheared surfaces. The formation of the sheared surfaces eliminates a need to press portions of the metal base plate positioned at both the sides of the thin-walled portion into both the sides during the processing of the thin-walled portion and the thin-walled portion can thus be formed at a high compression processing rate with a smaller processing load.