Process for manufacturing rolling contact member, process for manufacturing rolling bearing, raceway member of rolling bearing and rolling bearing

摘要

A process for manufacturing a rolling contact member comprises preparing a steel member consisting of a steel containing 0.7 mass % or more of carbon; performing hot forging of the steel member prepared in the steel member preparation step to thereby obtain a blank ring as the first forged member; performing turning of the blank ring obtained in the hot forging step to thereby remove part of the blank ring; and performing cold forging of the blank ring wrought in the first turning step to thereby obtain a stepped ring. In the steps subsequent to the cold forging step, on the stepped ring, the area wrought in the first turning step is not subjected to cutting.

主权项

1. A process for manufacturing a raceway member comprising:
a steel member preparation step of preparing a steel member made of steel containing at least 0.7 mass % of carbon; a hot forging step of preparing a first forged member by hot-forging said steel member prepared in said steel member preparation step to form the first forged member having an annular shape; an annealing step of annealing said first forged member to form an annealed first forged member; a first cutting step of removing a part of said annealed first forged member by cutting said first forged member; a cold forging step of preparing a second forged member by cold-forging said annealed first forged member cut in said first cutting step to form the second forged member as a stepped ring having a first annular portion and a second annular portion wherein a diameter of an opening in the first annular portion is greater than a diameter of an opening in the second annular portion; and a second cutting step of removing a part of said second forged member wherein an area of said second forged member cut in said first cutting step is not cut in a step subsequent to the cold forging step.