| 摘要 |
PURPOSE:To shorten the set-up time without damaging a steel plate by abolish ing a bending by a big spatula and by bending a steel plate with plural pressing dies in case of bending the steel plate in the prestage of a lock seaming. CONSTITUTION:A steel plate 10 is bent in about U shape by pressing to a mandrel 12 and the one end 10a of the steel plate 10 is bent in L shape and other end 10b in dogs leg shape. The steel plate 10 is pressed to the mandrel 12 direction simultaneously from both sides by plural press dies 13, 14, 15. Said one end 10a of the bent part of the steel plate 10 is then overlapped with press ing to the inner side of the other end 10b. The overlapped part is formed with bending in the mandrel 12 direction according to the lock seaming. |
