METHOD FOR MANUFACTURING ANNULAR MOLDING

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing an annular molding capable of reducing facility expenses and manufacturing costs, while sufficiently heightening mechanical strength by securing uniformity of a structure in the annular molding.

SOLUTION: The method for manufacturing an annular molding includes a forging process S2 for manufacturing a disk-shaped forged body by forging an alloy material, and a ring rolling process S4 for manufacturing the annular molding by performing ring rolling of an annular intermediate acquired by forming a through hole into the forged body. In the forging process S2, hot forging by which an absolute value εθ1 of strain in the circumferential direction of the forged body becomes ≥0.3, an absolute value εh of strain in the height direction of the forged body becomes ≥0.3, and the ratio εh/εθ1 between each absolute value of the strain falls in the range of 0.4-2.5, is performed at least twice or more.

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