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:
Mar. 21, 2006
Filed:
Apr. 21, 2003
Minoru Ando, Nagoya, JP;
Shigahisa Saida, Nagoya, JP;
Minoru Ando, Nagoya, JP;
Shigahisa Saida, Nagoya, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A method of making a flanged tubular metallic part by cold forging is provided. The method comprises a step of forming an axial depression in a blank and a flange forming step of making the depression axially deeper while causing a metal of the blank to flow radially outward thereby forming the blank into an intermediate product having a flange. The flange forming step includes axially moving an inner punch of a die assembly so as to cause a leading end of the inner punch to be positioned more forward than a backward side surface of the flange thereby causing the intermediate product to be formed with a sleeve portion that is position backward of the flange while allowing an outer punch of the die assembly to apply a biasing force to a backward side surface of the flange during formation of the flange.