Patent ID: 8770005

Claim:
A method of manufacturing an outwardly flanged metal member comprising outward flange portions protruding radially outwardly from a plurality of positions along a circumferential direction on one side of an outer peripheral surface in an axial direction, the method comprising: providing a die and a punch, the die comprising a stationary die and a movable die to which a first elastic force toward the stationary die is applied, at least one of the stationary die and the movable die forming flange molding cavities adapted to work the outward flange portions, the punch being movable through inside the movable die; and plastically working, while surrounding a periphery of a metal blank by the die and butting a distal face of the movable die and a distal face of the stationary die, an axial end face of the blank by pressing the axial end face with the punch under a warm or hot condition, wherein the plastically working comprises forming the outward flange portions by filling the flange molding cavities with a portion of the blank, wherein a magnitude of the first elastic force that presses the movable die toward the stationary die is set such that, while the movable die is butted against the stationary die along with a downward movement of the punch, the movable die cannot be prevented from floating up from the stationary die when the flange molding cavities are filled with the blank, and wherein, until the blank enters partway into the flange molding cavities, the movable die is butted against the stationary die by in addition to the first elastic force, a friction force acting on a contact portion between an outer peripheral surface of the blank and an inner peripheral surface of the movable die, and without using a second elastic force of an elastic member disposed around the punch, and subsequently, in a course of filling the flange molding cavities with the blank, the butting of the movable die against the stationary die is maintained by, in addition to the first elastic force and the friction force, the second elastic force of the elastic member disposed around the punch, the second elastic force being larger than the first elastic force.