Improved centrifugally-cast tube and related method and...

B - Operations – Transporting – 23 – D

Patent

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Details

B23D 43/04 (2006.01)

Patent

CA 2454392

An improved centrifugally-cast tube (10) is provided, along with a related method and apparatus (22) of making the tube (10). The tube (10) includes a plurality of grooves (20) and bosses (18) that are mechanically machined into an interior surface of the tube, such as by a broaching process. The profile of grooves and bosses may be defined by a plurality of intersecting concave and convex radii. The method essentially consists of mechanically deforming the interior surface (16) of the tube (10) by passing a series of cutting inserts (64) on support rings (62) having incrementally-differing dimensions over the interior surface (16). An apparatus is also provided which includes a telescoping shaft (48) upon which is mounted at least one cutting tool (62) that has a plurality of cutting inserts (64) and is adapted to form a plurality of grooves (20) and bosses (18) in the interior surface (16) of the tube (10). The grooves (20) and bosses (18) may be straight or spiraled.

Tube (10) obtenu par coulée centrifuge amélioré et procédé et appareil (22) permettant de fabriquer ledit tube (10). Ce tube (10) comporte une pluralité de creux (20) et de bosses (18) usinés mécaniquement dans une surface intérieure (16) du tube (10), par exemple par un processus de brochage. Le profil des creux et des bosses peut être défini par une pluralité de courbures concaves et convexes s'entrecroisant. Ledit procédé consiste essentiellement à déformer mécaniquement la surface intérieure (16) du tube (10) en passant sur ladite surface intérieure (16) une série de pièces rapportées de coupe (64) situées sur des anneaux de support (62) dont les dimensions augmentent par paliers. La présente invention concerne également un appareil comportant un arbre télescopique (48) sur lequel est monté au moins un outil de coupe (62) possédant une pluralité de pièces rapportées de coupe (64), ledit appareil étant adapté pour former une pluralité de creux (20) et de bosses (18) dans la surface intérieure (16) du tube (10). Les creux (20) et bosses (18) peuvent être droits ou en spirale.

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