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

Abstract

A process for manufacturing a rolling contact member that while simultaneously avoiding the problem attributed to generation of decarburized layer and the problem attributed to scale generation, attains reduction of manufacturing cost. The process comprises the steel member preparation step of preparing a steel member consisting of a steel containing 0.7 mass % or more of carbon; the hot forging step of 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; the first turning step of performing turning of the blank ring obtained in the hot forging step to thereby remove part of the blank ring; and the cold forging step of 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 operation.

1 . A process for manufacturing a rolling contact 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;   a cutting step of removing a part of said first forged member by cutting said first forged member prepared in said hot forging step; and   a cold forging step of preparing a second forged member by cold-forging said first forged member cut in said cutting step, wherein   an area of said second forged member cut in said cutting step is not cut in a step subsequent to the cold forging step.   
   
   
       2 . A process for manufacturing a rolling bearing, comprising:
 a raceway member manufacturing step of manufacturing a raceway member,   a rolling element manufacturing step of manufacturing a rolling element, and an assembling step of assembling a rolling bearing by combining said raceway member manufactured in said raceway member manufacturing step and said rolling element manufactured in said rolling element manufacturing step with each other, wherein said raceway member manufacturing step is executed by the process for manufacturing a rolling contact member according to  claim 1 .   
   
   
       3 . A raceway member of a rolling bearing manufactured by the process for manufacturing a rolling contact member according to  claim 1 . 
   
   
       4 . A bearing ring of a tapered roller bearing manufactured by the process for manufacturing a rolling contact member according to  claim 1 . 
   
   
       5 . A rolling bearing comprising:
 a raceway member; and   a plurality of rolling elements arranged on an annular raceway in contact with said raceway member, wherein   said raceway member is the raceway member of a rolling bearing according to  claim 3 .