Patent ID: 7685717

Claim:
A method for manufacturing an inner ring of a roller bearing, comprising the steps of: working a material formed from a steel for bearing manufacture into predetermined shapes to form at least a race of the inner ring of the roller bearing in order to produce a blank for forming the inner ring; hardening by heating at least the race of said blank; finishing the race of said blank hardened by heating to predetermined precisions; and roller burnishing said finished race by holding a ball in rolling contact therewith, as the ball is pressed against the race with high pressure, thereby hardening the race, wherein a steel for bearing manufacture is used as said material, and wherein the race is subjected to said roller burnishing, thereby achieving a hardness of HRC65 or more at a surface thereof and a center-line average roughness Ra of 0.1 μm or less at the surface thereof and achieving a hardness of HRC60 or more at a depth of at least 0.2 mm from the surface thereof.