Forming technique using discrete heating zones

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 39/20 (2006.01) B21D 26/02 (2006.01) B21D 37/16 (2006.01) B21D 41/04 (2006.01)

Patent

CA 2283745

A forming device including discrete heating zones (18a-18d) along the axial length and circumferential portion of a mold cavity (23). One zone can be heated to cause the heated tube portion to become more elastic than the non- heated tube portions. As a result, less axial force and radial pressures are required in order to provide the necessary metal deformation against the mold halves (12, 14). Preferably, the heating zones (18a-18d) are provided by way of a series of induction coils (16a-16d) disposed along the axial length and circumferential portion of the tube (26). Each induction coil (16a-16d) can be individually energized so that select portions of the tube (26) are heated in a controlled manner.

Le dispositif de formage de la présente invention comporte une pluralité de zones de chauffe discrètes (18a-18d) réparties le long de l'axe longitudinal et en périphérie d'une cavité de moulage (23). On a la possibilité de chauffer une zone de façon que la partie de tube chauffée devienne plus élastique que les parties non chauffées du tube. Il en résulte qu'il y a besoin de moins de force axiale et de pression radiale pour provoquer la nécessaire déformation du métal contre les moitiés de moules (12, 14). Les zones de chauffe (18a-18d) sont de préférence alimentées au moyen d'une série de bobines d'induction (16a-16d) réparties le long de l'axe longitudinal et en périphérie du tube (23). Chaque bobine d'induction (16a-16d) peut être activée individuellement de façon à pouvoir chauffer de façon contrôlée les parties sélectionnées du tube (26).

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