Patent ID: 9592547
Date: 2017-03-14
CPC Classifications: B21H,B21J,B21K,B23P

Claim:
1. A method of manufacturing an annular material comprising: a forging process of making a discoid forged material by forging an alloy material; and a ring rolling process of making an annular material by performing ring rolling on an annular intermediate made by forming a through-hole in the forged material, wherein, in the forging process, hot forging is performed at least twice in such a way that an absolute value εθ the method further comprising an annular intermediate material preparing process by boring the discoid forged material to form a through-hole therein in such a way that a ratio T/H of a thickness T of the annular intermediate material in a radial direction orthogonal to the axial line direction to the height H is set in a range of 0.6 to 2.3, wherein the annular material is for a turbine disk of an aircraft engine, the discoid formed material obtained in the forming process has a height H along an axial line direction of the discoid forged material of 60 mm to 500 mm, and εh is obtained by a formula (1): h εθ θ