| abstract |
An object of the present invention is to provide a method of manufacturing an annular molded body that can reduce the facility cost and the manufacturing cost while ensuring the uniformity of the structure in the annular molded body and sufficiently increasing the mechanical strength. SOLUTION: A forging step S2 for producing a disk-shaped forged body by forging an alloy base body, and an annular formed body is produced by ring rolling an annular intermediate body formed with a through hole in the forged body. A ring rolling step S4, and in the forging step S2, in the forging step S2, the absolute value εθ1 of the circumferential strain of the forged body is 0.3 or more, and the height direction of the forged body Hot forging in which the absolute value of strain εh is 0.3 or more and the ratio εh / εθ1 between these absolute values of strain is in the range of 0.4 to 2.5 is performed at least twice. . [Selection] Figure 3 |