초록 ▼

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

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 .mu.m below the surface of the metallic product is made -1300 MPa or higher.

대표청구항 ▼

[ What is claimed is:] [1.] A metallic product surface treatment method comprising the step of:injecting onto a surface of a metallic product to be treated a mixture of at least two different diameter shots, the shots being made from a material having a hardness wherein the hardness is at least equa

[ What is claimed is:] [1.] A metallic product surface treatment method comprising the step of:injecting onto a surface of a metallic product to be treated a mixture of at least two different diameter shots, the shots being made from a material having a hardness wherein the hardness is at least equal to a hardness of the product to be treated and wherein the shots are injected at an injection pressure of at least 0.29 MPa and at a velocity of at least 50 m/sec.