To provide a manufacturing method by which an annular member whose shape accuracy is improved is obtained by suppressing the variation of the shape caused by springback.
This method for manufacturing the annular member by applying bending to a metallic sheet has an inverse bending stage for bending the metallic sheet in the opposite direction of a planned bending direction and a regular bending stage for preparing the annular member by bending the obtained metallic sheet which has been bent in the opposite direction in the planned direction. By this manufacturing method of the annular member, the springback is reduced by lowering the yield stress of a material when the metallic sheet is worked into the annular shape by the inverse bending stage and the annular member whose shape accuracy is improved is manufactured by reducing the spread caused by the springback in the butt part.
NONOYAMA FUMIO
OGAWA KAZUYOSHI
TOYOTA CENTRAL RES & DEV
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