Method and device for cutting off a thick-walled pipe

Details Method and device for cutting off a thick-walled pipe Method and device for cutting off a thick-walled pipe

B - Operations, Transporting

23

D

B23D 45/10 (2006.01)

Patent

CA 2583130

The invention relates to a method for cutting off a thick-walled pipe (3), wherein the pipe to be cut comprises an inner circumference closer to the longitudinal axis of the pipe and an outer circumference further from the longitudinal axis of the pipe. The method comprises bringing the cut-off point of the pipe to the cut-off point of a sawing unit, locking the pipe in its place by means of a fastener, sawing the pipe at the cut-off point by moving a saw (2) of the sawing unit towards the centre of the pipe (3), the sawing unit comprising at least two saws. The method is characterized by moving each saw (2) of the sawing unit during the sawing radially towards the centre of the pipe until the saw blades pass through the inner surface of the pipe, and rotating the pipe during the sawing with respect to its longitudinal axis by means of a rotating device (10) connected to the fastener until the pipe is cut off, whereby, due to the rotating of the pipe, the blades (25) of the saw (2) work the pipe during a blade revolution only in one direction, which is directed from the outer circumference towards the inner circumference. Furthermore, the invention provides a saw assembly and a rotating device for implementing the method.

La présente invention concerne un procédé de découpe de tuyau à parois épaisses (3), dont la circonférence interne est proche de l'axe longitudinal du tuyau et dont la circonférence externe est éloignée de l'axe longitudinal du tuyau. Le procédé consiste à amener le point de coupe du tuyau au point de coupe d~une machine à scier, à verrouiller le tuyau en place par une fixation, à scier le tuyau au trait de coupe en amenant la scie (2) de la machine à scier en direction du centre du tuyau (3) ; la machine à scier comprenant au moins deux scies. Le procédé est caractérisé par le déplacmeent de chaque scie (2) de la machine à scier pendant le sciage vers le centre du tuyau jusqu'à ce que les lames de scie traversent la surface interne du tuyau, puis par la rotation du tuyau pendant le sciage par rapport à son axe longitudinal au moyen d'un dispositif de rotation (10) relié à la fixation jusqu'à ce que le tuyau soit coupé. Ainsi, du fait de la rotation du tuyau, les lames (25) de la scie (2) travaillent le tuyau pendant la rotation de la lame seulement dans un sens, de la circonférence externe vers la circonférence interne. En outre, l'invention prévoit un ensemble de sciage et un dispositif de rotation pour utiliser le procédé.

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