Method for manufacturing ring member for bearing, and mold for inversion working

A method for manufacturing a bearing ring member having a cylindrical shape, the method comprising:

• an inversion step of deforming a workpiece having an annular shape by sandwiching the workpiece between a punch disposed on a first side of the workpiece and a die disposed on a second side of the workpiece opposite to the first side in a predetermined direction in which the punch and die are configured to move relative to each other,
• wherein the punch includes a first R surface formed in a circular arc shape in a cross section parallel to the predetermined direction,
• the die includes a second R surface formed in a circular arc shape in a cross section parallel to the predetermined direction, and a tapered surface formed on the second side of the second R surface and inclined with respect to the predetermined direction, and
• the inversion step includes a first step of deforming the workpiece using the punch and the die in a state where the first R surface and the second R surface are in contact with the workpiece, and a second step of deforming the workpiece using the punch and the die in a state where the first R surface and the tapered surface are in contact with the workpiece, after the first step.