Method and device for increasing diameter of metal shaft...

B - Operations – Transporting – 21 – J

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B21J 5/08 (2006.01) B21D 17/02 (2006.01) B21D 41/02 (2006.01) B21F 5/00 (2006.01) B21J 9/02 (2006.01) B21K 1/12 (2006.01)

Patent

CA 2325078

Method and apparatus for diametrically expanding a desired part of a metal shaft which can be a rod or a pipe, wherein the apparatus includes a driving rotary section (4) and a driven rotary section (6) arranged at a predetermined distance (D), each of the rotary sections (4) and (6) including a holder for holding a work, a pressing device (8) for pressing the work held by the holders along the length of the apparatus, and a biasing device (7) for declining the axis of the work, so that the work held by the holders at the distance (D) is rotated around its axis, and one of the holders is forced by the pressing device toward the other to carry out the diametral expansion, and then the work is bent back and straightened up.

Dispositif permettant d'accroître le diamètre d'un tube métallique, qui comprend un élément rotatif d'entraînement (4) et un élément rotatif entraîné (6) opposés, séparés d'une certaine distance; un élément support de tube, disposé sur chaque élément rotatif; un élément d'entraînement (5) faisant tourner l'élément rotatif d'entraînement; un moyen de compression (8), qui presse le tube porté par l'élément support en direction axiale; et un élément excentrique (7), qui incline l'axe du tube. Un tube métallique linéaire ou un tuyau métallique, constituant la pièce à travailler, est saisi, à une distance D appropriée, par la paire d'éléments supports opposés; une rotation axiale est imprimée à la pièce; et au moins l'un des corps supports rotatifs est rapproché de l'autre de façon à inverser la coudure et ainsi à redresser la pièce une fois que la partie à diamètre augmenté, en forme de collier, a été formée.

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