MANUFACTURING METHOD FOR RING FORMED BODY

摘要

Provided is a manufacturing method for a ring formed body, the method enabling the ring formed body with a reduced dead metal region to be reliably and efficiently manufactured. In this invention, the ring formed body is manufactured in such a way that: a first forging is performed on a raw material so as to form a shape which has a disk-shaped bottom section and a circumferential wall section which is inclined in the direction from the center of the bottom section toward the outer circumference of the bottom section as going from the outer circumference of the bottom section to one side of the central axis line direction of the bottom section; the bottom section of the first forged body obtained through the first forging is then punched; the punched body is ring rolled; a ring material obtained through the ring rolling is disposed inside two dies; and then a second forging is performed on the ring material such that the ring material is pressed in the central axis line direction thereof by means of the two dies.