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. 17, 2015
Filed:
Oct. 14, 2011
Kazunori Kurahashi, Hadano, JP;
Maiku Mikami, Hadano, JP;
Kazunori Kurahashi, Hadano, JP;
Maiku Mikami, Hadano, JP;
Nittan Valve Co., Ltd., Hadano-shi, JP;
Abstract
A method of manufacturing a valve () is provided, in which an intermediate valve product having a generally disk-shape valve head is formed by a die unit (). The valve head is then machined to have a proper thickness and a tapered face on the periphery of the disk-shape valve head. The valve head is repeatedly forged in secondary forging by means of a die unit () equipped with a die () and a press punch () while angularly displacing the tapered face relative to the die () through a predetermined angle. Since the die () has protruding pressing sections and grooves () along the circumference of the die, a uniformly deformed and hardened valve face () is formed on the valve head.