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Title: Method For A Surface Treatment of Metallic Product
Author: Yoshio Miyasaka
Source: US Patent 6,038,900
Publication year 2000
Document number: 2000010
Number of pages: 12
Abstract:
The present invention relates to a method for a surface treatment of a metallic product. In this method, by conducting one step of injecting mixture shots including at least
two types of shots comprised of different or same materials consisting of high hardness metal or metallic component and having different shot diameters between 0.6 and 0.03
mm onto the surface of a metallic product at an injection pressure of not less than 0.29 MPa or not less than 50 m/sec, the residual compressive stress of the surface of the
metallic product and that of a lower surface layer are made at least -1200 MPa and that of a portion having a depth of about 50 µm below the surface of the metallic product
is made -1300 MPa or higher.
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