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:
Apr. 08, 2008
Filed:
Sep. 26, 2002
Takao Watanabe, Utsunomiya, JP;
Toshiaki Onuma, Tochigi-ken, JP;
Yoshimi Ueda, Utsunomiya, JP;
Takeshi Sasaki, Tochigi-ken, JP;
Takao Watanabe, Utsunomiya, JP;
Toshiaki Onuma, Tochigi-ken, JP;
Yoshimi Ueda, Utsunomiya, JP;
Takeshi Sasaki, Tochigi-ken, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A nitrogen trapping agent is added by a metering hopper to raw materials, which are melted and poured into a mold cavity of a metal mold device (). The molten metal is then cooled and solidified into a casting (B). Before the molten metal is fully cooled and solidified, free nitrogen present in the molten metal is quickly trapped by the nitrogen trapping agent, producing a nitride. Then, a chilled structure generated in the surface layer of the casting (B) is decomposed by heating the casting (B). Finally, the heated casting (B) is machined into a camshaft (A) which is a cast iron member as a final product.