Manufacture of metal tubes

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 45/00 (2006.01) B21C 1/00 (2006.01) B21C 1/24 (2006.01) B21C 1/32 (2006.01) B21C 3/16 (2006.01) B21C 23/00 (2006.01) B21C 37/06 (2006.01)

Patent

CA 2460064

The manufacture of seamless tubes in which the process includes providing an assembly having a metal tube blank (1), and an elongate metal core (2) of shape memory effect material which is surrounded and contacted by the tube blank (1) with a minimal gap. The assembly is elongated by mechanical working thereof at an elevated temperature until the tube blank (1) has been converted into a tube of desired dimensions. After the elongation step, the core (12) is subjected to a treatment which results in the core being in a stretched condition throughout its length, and does not substantially stretch the tube (11). The core is removed from the tube, and subsequently subjected to drawing passes over a nondeformable mandrel thereby refining the precision of diametric and wall dimensions with improved ID and OD surface quality. There is also decoring and reinserting to improve final dimensions which results in the ability to fabricate smaller, longer tubes (111).

L'invention concerne un procédé de fabrication de tubes sans soudure qui consiste à élaborer un ensemble comprenant une ébauche de tube métallique (1) et un noyau métallique allongé (2) constitué d'un matériau à mémoire de forme qui est entouré par l'ébauche du tube (1) avec laquelle il se trouve en contact de façon à laisser un espace minimal. Pour allonger l'ensemble, on le soumet à un travail mécanique à une température élevée jusqu'à ce que l'ébauche du tube (1) ait été transformée en un tube présentant les dimensions souhaitées. Après l'étape d'allongement, le noyau (12) est soumis à un traitement qui fait passer le tube (11) dans un état allongé sur sa longueur, sans pour autant sensiblement l'allonger. Le noyau est enlevé du tube, puis soumis à des phases d'étirement sur un mandrin non déformable afin d'affiner la précision des dimensions diamétriques et des dimensions de paroi de façon à obtenir une meilleure qualité de surface du diamètre intérieur et du diamètre extérieur. En outre, le débourrage et la réinsertion pour améliorer les dimensions finales permettent de fabriquer des tubes plus petits et plus longs (111).

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