Method of hydroforming tubular members

Details Method of hydroforming tubular members Method of hydroforming tubular members

B - Operations, Transporting

21

D

B21D 26/02 (2006.01) B21C 37/08 (2006.01) B21D 51/10 (2006.01) B21D 53/88 (2006.01)

Patent

CA 2339840

Tubular members (10) for use in vehicle frames are easily and economically produced using a hydroforming process in which a high pressure fluid is presented to the interior of a tubular member (10), thus causing the tube to expand to meet the interior walls of a forming die (35). Tubular members (10) can be formed having significant variations in their circumference, diameter along their lengths, or gage along their lengths by using a stamped blank (15) having a predetermined shape which is formed into a preformed tube (25) which roughly mirrors the shape of the desired finished tubular member (10).

Selon cette invention, on peut fabriquer des éléments tubulaires (10) pour cadre de véhicule de manière aisée et économique en utilisant un procédé d'hydroformage dans lequel un liquide sous haute pression est introduit à l'intérieur d'un élément tubulaire (10), sous l'effet de quoi le tube se dilate pour épouser la forme des parois internes d'un moule de formage (35). On peut fabriquer des éléments tubulaires oblongs (10) dont la circonférence, le diamètre et l'épaisseur varient sensiblement, et ce en utilisant une ébauche emboutie (15) qui possède une forme prédéterminée; on travaille cette ébauche pour lui conférer la forme d'un tube préformé (25) qui reflète grossièrement la forme finale de l'élément tubulaire désiré (10).

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