B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
B21D 47/01 (2006.01) B21D 22/26 (2006.01) B21D 39/02 (2006.01)
Patent
CA 2736556
A method for reducing the number of sub-parts of a closed structure part and the number of steps for manufacturing the closed structure part is provided and, therefore, the closed structure part is efficiently manufactured. In the method for manufacturing closed structure parts, a punch 84 is moved in the pressing direction. A joint end 19, which is one of two joint ends of a blank 24, is bent using a pressing force exerted by a flange processing portion 102. The joint end 19 overlaps a joint end 21, which is the other joint end of the blank 24. The joint end 19 is made into a latch flange portion 20 for latching the joint end 21. At the same time, the blank 24 is pressed by using two press forming surfaces 96 and 97, and two shoulder portions 26 of the blank 24 are press--formed into predetermined shapes. In this way, the joint end 19 is made into the latch flange portion 20. The latch flange portion 20 latches the other joint end 21, and the latch flange portion 20 can be fixed to the joint end 21. Simultaneously, the two shoulder portions 26 can be press-formed into predetermined shapes.
La présente invention concerne un procédé efficace de fabrication d'un élément structurel fermé avec utilisation d'un nombre réduit de pièces et des processus de fabrication de l'élément structurel fermé. Selon ce procédé de fabrication de l'élément structurel fermé, une matrice (84) est poussée dans le sens de la pression de façon à plier un bord (19) de l'ébauche (24) grâce à la force de pression appliquée par la zone de formage des lèvres (102). Cette opération donne à ce bord la forme de la contre-lèvre (20) devant se rabattre sur la face extérieure de la lèvre de base (21) de façon à contenir la lèvre de base (21). Simultanément, l'ébauche (24) est comprimée par une paire de surfaces de formage par pression (96, 97) de façon à donner sa forme prédéfinie à chaque épaulement de la une paire d'épaulements (26) de l'ébauche. Le bord (19) considéré devient ainsi la contre-lèvre (20) devant contenir la lèvre de base (21) et vient se solidariser avec l'autre bord, les deux épaulements (26) prenant simultanément leurs formes prédéfinies.
Higai Kazuhiko
Hira Takaaki
Ochi Katsuhiro
Yamasaki Yuji
Jfe Steel Corporation
Moffat & Co.
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