To provide a manufacturing method of a metallic ring-shaped rough shape material by which ring-shaped parts having parallel disk surfaces are economically obtained, also the yield of material when manufacturing the ring-like shape material is improved and which is suitable to efficiently manufacture the ring-like parts having high dimensional accuracy.
A band plate consisting of a metal is used as a base stock, formed into an annular shape by bending in the width direction of the band plate, next, by performing the butt welding of mutual end faces, a ring-like member the thickness of which is gradually increased from the outside toward the inside is made and rotary rolling-forming for reducing thickness deviation of the ring-like member is applied to the ring-like member with a pair of reduction rolls.
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HASHIMOTO YUJI
SONOBE OSAMU
