Method of manufacturing a hollow vehicle frame component...

B - Operations – Transporting – 21 – D

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B21D 22/00 (2006.01) B62D 21/11 (2006.01) B62D 25/00 (2006.01)

Patent

CA 2224503

A method of manufacturing a hollow vehicle frame component having at least one relatively sharp bend may include the initial step of pre-forming a generally linear, hollow member into a desired configuration. The hollow member may be expansion shaped by a hydroforming process. Next, a section of the hollow pre-formed member is removed at a location where it is desired to provide a relatively sharp bend. The section is removed along a portion of the pre-formed member so as to divide it into two sections, thereby forming a hinge-like structure therebetween. The two sections are then bent toward one another such that the edges adjacent the removed section are moved toward one another. Finally, the adjacent edges are secured together to form the vehicle frame component. Portions of the edges may abut one another or overlap one another for securement. A plurality of such bends may be formed in the hollow member. The ends of the hollow member may extend within a single plane or within different planes. The magnitude of the angle formed in the member is dependent upon the sized of the section which is removed therefrom.

Méthode de fabrication d'un élément creux d'un châssis de véhicule doté d'au moins un coude relativement aigu pouvant comprendre l'étape initiale de préformage d'un élément creux, généralement linéaire dans une configuration donnée. L'élément creux peut être formé par dilatation dans un procédé d'hydroformage. Ensuite, une section de l'élément creux préformé est retirée de l'emplacement où l'on désire un coude relativement aigu. Elle est retirée le long d'une partie de l'élément préformé de façon à la diviser en deux sections, formant ainsi une structure à charnière entre les deux. Les deux sections sont alors recourbées l'une vers l'autre de façon à rapprocher les bords contigus à la section retirée. Finalement, les bords contigus sont fixés ensemble pour former l'élément de châssis du véhicule; des parties des bords peuvent être contiguës ou se chevaucher. De nombreux coudes à angle aigu peuvent être formés dans l'élément creux dont les extrémités peuvent se prolonger à l'intérieur d'un ou de plusieurs plans. La grandeur de l'angle formé dans l'élément résulte de la dimension de la section retirée.

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