Method of forming and piercing a tube

Details Method of forming and piercing a tube Method of forming and piercing a tube

B - Operations, Transporting

21

D

B21D 22/02 (2006.01) B21D 26/02 (2006.01) B21D 28/28 (2006.01)

Patent

CA 2274470

A metal tube is cold formed into a stamped member by filling the tube with a liquid change-of-state material, freezing the change-of-state material, sealing the tube containing the solid change-of-state material, and stamping the tube in a die. The change-of-state material compresses during the stamping step to force the walls of the tube to conform to the die cavity, eliminating the need to pressurize the tube prior or subsequent to stamping. Additionally, the solid within the tube provides support to the wall of the tube during a piercing step to form a hole in the tube having less deformation surrounding the hole than a comparative tube pierced without having the solid fill. After the stamping or piercing steps, the change-of-state material is melted and drained from the tube. Further, a tube is pierced by forming an outwardly bulged area and piercing the tube in the outwardly bulged area while simultaneously depressing the tube to substantially flatten the outwardly bulged area.

Dans cette invention, pour former à froid un tube de métal dans une pièce estampée, on remplit le tube d'une substance liquide à changement de phase, on congèle la substance à changement de phase, on bouche le tube contenant la substance à changement de phase, et on estampe le tube dans une matrice. Lors de l'estampage, la compression de la substance à changement de phase force les parois du tube à épouser les contours de l'empreinte de matrice, ce qui rend superflu la mise du tube sous pression avant ou après estampage. De plus, le solide à l'intérieur du tube soutient la paroi de celui-ci lors du perçage destiné à former un trou dans le tube; il une résulte une déformation moins importante autour du trou que dans le cas de perçage d'un tube non rempli de solide. Après estampage ou perçage, on fait fondre la substance à changement de phase pour qu'elle sorte du tuyau. En outre, pour percer le tube, on forme une zone de renflement, puis perce le tube dans la zone de renflement et on enfonce en même temps le tube pour aplatir sensiblement la zone de renflement.

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