| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a bearing ring of a rolling bearing, capable of reducing deformation at the time of heat treatment and enhancing a lifetime under foreign matter contamination or lubrication, and having excellent dimensional stability and high production efficiency.SOLUTION: A method for manufacturing the bearing ring of a rolling bearing comprises: heating and carbonitriding an inner ring 7 at a temperature exceeding an Atransformation point and cooling it to less than the Atransformation point in a carbonitriding/cooling chamber 1; induction-heating the inner ring at a heating temperature or more of carbonitriding and less than the heating temperature+100°C in an induction heating coil 22 of an induction heating part 2; hardening and reforming the inner ring in a cooling/reforming part 3; cooling the inner ring 7 until it is put into an outer diameter restraining form 34 and a cooling temperature becomes equal to or less than an Mpoint in the middle of the cooling before reaching the Mpoint; annealing the inner ring at a high frequency and reforming it by an outer diameter restraining ceramic form 42 in an annealing/reforming part 4; and removing an oxide film formed on the surface of the inner ring in an oxide film removing chamber 5. |
