Manufacturing method for toothed member, manufacturing device for toothed member, and toothed member

A manufacturing method for a toothed member, the method comprising:

• providing a cup-shaped raw material, the cup-shaped raw material comprising a bottom surface portion and a cylindrical side wall portion that extends upright from an outer peripheral end portion of the bottom surface;
• providing a manufacturing device comprising a compression die, a restraint die and a pressure receiving member;
• compressing the side wall portion in an axial direction of the cup-shaped raw material using the compression die;
• restraining a first surface of the bottom surface portion located on a side of an opening end of the cup-shaped raw material using the restraint die;
• restraining a second surface of the bottom surface portion located on the opposite side of the bottom surface portion from the first surface portion using the pressure receiving member;
• a thickened tooth shaping process in which a toothed shape is formed on the side wall portion while making a thickness of the side wall portion larger than a thickness of the bottom surface portion by relatively moving the compression die with respect to the restraint die and the pressure receiving member in the axial direction from the side of the opening of the cup-shaped raw material toward the bottom side portion;
• wherein the thickened tooth shaping process further comprises applying a load to the restraint die to keep restraining the first surface and the second surface.