Patent ID: 7278285

Claim:
A method of producing a tubular formed body, comprising the steps of: using a forming device having a rotating frame and a forming blade movable in axial and radial directions of the rotating frame; fixing one side-edge portion of a tubular blank to a predetermined position of the rotating frame; setting the other side-edge portion of the tubular blank to the rotating frame so that the other side-edge portion is movable; pressing the forming blade to an inner diameter side of a peripheral wall of the tubular blank while rotating the rotating frame; moving the forming blade from the fixed side-edge portion toward the movable side-edge portion while reciprocating the forming blade in a radially outward direction; and forming a tubular formed body in which at least any one of a ridge portion and a recess portion continuing in circumferential direction is shaped in the peripheral wall, wherein the tubular formed body is an annular shell of a run-flat support body.