Patent ID: 9314833
Filing Date: 2016-04-19
CPC Classification: B21D,B24C,F16C,F16D,Y10T

Claim Text:
1. A method for manufacturing an outer ring for a shell-type radial needle bearing comprising steps of: performing a drawing process on a circular plate shaped metal raw material to form a circular shape, or performing plastic working of a circular column shaped metal raw material to form a circular shape, so as to obtain an intermediate raw material having a cylindrical section and a bottom plate section, and then performing a shot peening on an outer surface side of the cylindrical section and the bottom plate section of the intermediate raw material so as to create residual compressive stress in a surface and a surface layer section on the outer surface side of the cylindrical section and the bottom plate section, while maintaining residual compressive stress on an inner surface side of the cylindrical section and the bottom plate section of the outer ring at substantially a same level as the residual compressive stress of the outer surface side of the cylindrical section and the bottom plate section prior to performing the shot peening.