METHOD FOR MANUFACTURING BEARING RING MEMBER

摘要

Provided is a method for manufacturing a bearing ring member, whereby processing cost can be reduced and a high degree of freedom in design is obtained, by disposing a metal material of a raw material (13a), the metal material having excellent metal characteristics such as fatigue strength and wear resistance and excellent processing characteristics such as hardenability, in a portion that flows to a portion (raceway surface, etc.) where the characteristics of the metal material are required during use or forging of a bearing ring member. The present invention is configured from a first metal part (23) in which the raw material (13a) is formed in a cylindrical shape, and a second metal part (24) formed in a columnar shape by a metal material having more excellent metal characteristics or processing characteristics than the first metal part (23). For example, the second metal part (24) is disposed in a portion on an inside diameter side of the first metal part (23), which is a portion of the raw material (13a) that flows to an outer raceway (5a, 5b) of an outer ring (2) during forging.

主权项

1. A manufacturing method for a bearing ring member, comprising a step of obtaining a bearing ring member having a raceway surface formed all around at least one circumferential surface of the outer-circumferential surface and inner-circumferential surface by performing a forging process on a metal material; wherein
the metal material is prepared such that the metal material comprises: a first metal part, and a second metal part that is made by using a different metal material than the first metal part, or made by performing a modifying process on the same kind of material as the first metal part; and the second metal part is provided only in a portion of the metal material which flows to a portion where characteristics of the metal material of the second metal part are required in use of or at processing of the bearing ring member.