Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yasuhiro Shimamura0
Hiroaki Koyama0
Michiharu Hasegawa0
Toshihiro Miyauchi0
Fumitaka Miyagawa0
Date of Patent
October 13, 2009
Patent Application Number
10532693
Date Filed
October 28, 2003
Patent Primary Examiner
Patent 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.
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