B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/90 (2006.01) B29C 47/92 (2006.01) B29C 55/26 (2006.01)
Patent
CA 2404219
The invention concerns a continuous manufacturing method which consists in producing a blank (E) by extrusion, bringing said blank to a temperature for molecular orientation, passing said blank around a radial expansion mandrel (12); gauging and cooling while subjecting the blank to axial traction. The radial expansion produced on the mandrel (12) is partial so that the internal diameter (B) of the blank (E), when it leaves the mandrel, is less than the nominal internal diameter (D) of the finished tube; performing an additional radial expansion of the blank, up to its nominal diameter, by internal fluid pressure. In permanent operating conditions, the inner surface of the blank (E) is no longer in contact with the mandrel (12).
Procédé de fabrication en continu selon lequel on réalise une ébauche (E) par extrusion, on amène cette ébauche à température d'orientation moléculaire, on fait passer cette ébauche autour d'un mandrin (12) de dilatation radiale, on assure un calibrage et un refroidissement, tout en soumettant l'ébauche à une traction axiale. La dilatation radiale réalisée sur le mandrin (12) est partielle de sorte que le diamètre interne (B) de l'ébauche (E), lorsqu'elle quitte le mandrin, est inférieur au diamètre interne nominal (D) du tube fini; on réalise une dilatation radiale complémentaire de l'ébauche, jusqu'à son diamètre nominal, par pression interne de fluide. En régime permanent de fonctionnement, la surface interne de l'ébauche (E) n'est plus en contact avec 1 mandrin (12).
Duval Guillaume
Prevotat Bernard
Alphacan
Robic
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