Manufacturing Method And Mold For Cylindrical Member

Abstract: This manufacturing method for a cylindrical member (10) comprises: a preparation step for preparing a workpiece (20); and a bending step for bending an end section (23) of the workpiece (20) toward the inner circumference side by using a lower mold (40) and an upper mold (30). A recessed processing surface (31) of the upper mold (30) includes a first portion (311) and a second portion (312). The first portion (311) extends toward the side opposite to the workpiece (20) in an axial direction and toward the inner peripheral side of the workpiece (20). The second portion (312) extends toward the inner peripheral side of the workpiece (20) from the first portion (311) and has a straight line shape. In the bending step, the first portion (311) guides the end section (23) to the inner peripheral side of the workpiece (20) and the second portion (312) sandwiches the end section (23) together with the lower mold (40).

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