Apparatus for rectifying round pipe and tubing

Details Apparatus for rectifying round pipe and tubing Apparatus for rectifying round pipe and tubing

B - Operations, Transporting

21

B

B21B 19/06 (2006.01) B21B 19/10 (2006.01) B21B 37/78 (2006.01) B21D 3/04 (2006.01)

Patent

CA 2542181

Apparatus for reducing the diameter, rounding or straightening of pipe or tubing by rolling comprising a plurality of closely and equally~spaced, long, narrow, parallel-cylindrical rollers arranged in a parallel~cylindrical array through which said pipe or tubing is passed at a constant linear speed, said rollers being skewed to displace their central contact zones radially inwards bringing them into forceful contact with the external surface of said pipe or tubing, and being rotated to cause said central contact zones to describe continuous, parallel, overlapping, helical paths along the external surface of said pipe or tubing and thereby to progressively apply locally to the whole of the external surface of said pipe or tubing a compressive force in excess of the yield strength of its material, causing said pipe or tubing to adopt a set at a smaller diameter.

L'invention concerne un appareil permettant de réduire le diamètre, d'arrondir ou de redresser un tuyau ou un tube, au moyen de rouleaux et comprenant une pluralité de rouleaux espacés de manière proche et égale les uns des autres, longs, étroits et parallèles-cylindriques, disposés dans un réseau parallèle-cylindrique à travers lequel le tuyau ou tube est passé à une vitesse linéaire constante, les rouleaux étant asymétriques afin de déplacer les zones de contact centrales de manière radiale vers l'intérieur, les amenant ainsi en contact forcé avec la surface externe du tuyau ou tube, et étant tournés de manière à contraindre les zones de contact centrales de définir des chemins continus, parallèles, chevauchants et hélicoïdaux le long de la surface externe du tuyau ou du tube et à appliquer ainsi progressivement et localement sur l'ensemble de la surface du tuyau ou du tube une force de compression excédentaire de la force de rupture du matériau, contraignant ainsi le tuyau ou tube à adopter un ensemble au niveau d'un diamètre inférieur.

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