Patent ID: 7867345
Filing Date: 2011-01-11
Classification: C21D,F16C

Abstract:
1. A manufacturing method of a thin component, including the steps of heating a thin component, and thereafter, while sizing with molds and using said molds as cooling media of said thin component, performing a quenching process on said thin component, wherein after said thin component is quenched, said thin component is tempered using said molds as temperature controlling media, said quenching process causes a martensitic transformation, a material of the thin component is steel containing carbon by at least 0.4 mass %, the thin component is a bearing ring of a thrust needle roller bearing, in said quenching, a pressing pressure by said molds is at least 2.94 N/cm the molds include an upper mold and a lower mold, and a heat capacity of one of the upper mold and the lower mold is at least 90 times as great as that of the thin component.