Closed structure parts, method and press forming apparatus...

B - Operations – Transporting – 21 – D

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B21D 47/01 (2006.01) B21D 22/26 (2006.01) B21D 39/02 (2006.01)

Patent

CA 2738292

The number of sub-parts of a closed structure part and the number of steps for manufacturing the closed structure part can be reduced and, therefore, the closed structure part can be efficiently manufactured. In a hemming press step, a punch 84 is further lowered, and a pair of flange portions 20 and 22 is inserted into a slit clearance 102. At that time, hemming prongs 28 are bent and, each of the hemming prongs 28 sandwiches the flange portion 22. Thus, the flange portion 20, which is one of the two flange portions, is joined to the other flange portion 22. At the same time, a pair of press forming surfaces 96 of the punch 84 presses a metal plate and performs press-forming on a pair of shoulder portions 26 of a blank 24 into a predetermined shape. In this way, the flange portion 20, which is one of the two flange portions, can be fixed to the other flange portion 22 using the hemming prongs 28 (hemming joint). In addition, the pair of shoulder portions 26 of the blank 24 can be press-formed into the predetermined shape.

L'invention concerne une méthode efficace de fabrication d'un élément à structure fermée utilisant un nombre réduit de pièces, et le procédé associé. Dans un processus d'emboutissage à bord rabattu, un poinçon (84) est abaissé jusqu'au côté de position de la presse pour insérer une paire de flasques (20, 22) dans une fente (102) et replier la saillie de bord rabattu (28), ce qui entraîne le serrage du flasque (22) dans la saillie du bord rabattu (28), et unit le flasque (20) au flasque (22). Parallèlement, comme ci-dessus, une plaque métallique est emboutie par les deux surfaces en relief (96) du poinçon (84) pour donner à une paire d'épaulements (26) d'un flan (24) une forme prédéterminée. Il en résulte que le flasque (20) peut être fixé (par le bord rabattu) au flasque (22) alors qu'en même temps, la paire d'épaulements (26) du flasque (24) peut être emboutie pour prendre une forme prédéterminée.

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