Patent ID: 7716838

Claim:
A method for manufacturing a bearing ring having an annular raceway ring main body portion formed from a first material, and an annular raceway surface formation portion formed from a second material having higher abrasion resistance and hardness than the first material and in which a raceway surface for rolling elements is formed on an outer peripheral surface or an inner peripheral surface thereof, wherein the above portions are integrally formed in concentric fashion, said manufacturing method comprising the steps of: manufacturing a raceway surface formation ring for forming the raceway surface formation portion using the second material; dividing the raceway ring main body portion into left and right halves in a plane perpendicular to a central axis of the raceway ring main body portion; preforming the first and second divided segments using the powder of the first material; manufacturing an annular composite member in which the raceway surface formation ring and the first and second divided segments are integrally formed by performing powder forging while the raceway surface formation ring and the first and second divided segments are mounted in a forging die; and performing a surface finishing treatment or other after-treatment on the composite member.