| 摘要 |
A forming device having a rotating frame ( 1 ) and a forming blade ( 2 ) movable in the axial and radial directions of the rotating frame. One side-edge portion of a tubular blank (B) is fixed to a predetermined position of the rotating frame ( 1 ), and the other side-edge portion is movably set on the rotating frame. While the rotating frame ( 1 ) is rotated, the forming blade ( 2 ) is pressed to the inner diameter side or the outer diameter side of a peripheral wall of the tubular blank (B). The forming blade is reciprocated from the fixed side-edge portion radially outward or inward and moved toward the movable side-edge portion. Thus, a tubular formed body in which at least a ridge portion or a recess portion continuing in circumferential direction is shaped in the peripheral wall is formed.
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