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:
Oct. 13, 2009
Filed:
Oct. 28, 2003
Hiroaki Koyama, Tochigi-ken, JP;
Yasuhiro Shimamura, Utsunomiya, JP;
Toshihiro Miyauchi, Tochigi-ken, JP;
Michiharu Hasegawa, Mie-ken, JP;
Fumitaka Miyagawa, Kumamoto-ken, JP;
Hiroaki Koyama, Tochigi-ken, JP;
Yasuhiro Shimamura, Utsunomiya, JP;
Toshihiro Miyauchi, Tochigi-ken, JP;
Michiharu Hasegawa, Mie-ken, JP;
Fumitaka Miyagawa, Kumamoto-ken, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A method of the surface treatment of a mold for casting, which comprises subjecting a cavity surface of a fixed mold made by the use of a SCM420 material to first shot peening, a sulfurizing-nitriding treatment and second shot peening. The resulting cavity surface of the fixed mold exhibits a high hardness of 700 or higher in terms of Vickers hardness due to the presence of a sulfurized and nitrided layer, and further has a compression residual stress of more than 1200 Mpa and a largest height, which is a surface roughness value defined by JIS standard, of 8 μm or less.