Method for replacing a turbine vane airfoil

B - Operations – Transporting – 23 – P

Patent

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Details

B23P 15/00 (2006.01) B23P 6/00 (2006.01) F01D 5/00 (2006.01) F01D 9/04 (2006.01)

Patent

CA 2383404

A method for refurbishing turbine engine vanes in which the airfoils are removed and replaced. The original configuration of the vanes can be modified from a single casting or welded pair to a multi-piece component assembly comprising individual airfoil segments attached to the inner and outer platforms. The component assembly allows replacement of airfoils (8, 10) and/or platforms (4, 6) with improved casings in the form of improved alloys, improved physical geometry, or both. Modifications can be made in the vanes class area without the need to modify the airfoil contours by brazing or other contour alteration processes. According to the method, the platforms (4, 6) are separated from the airfoils (8, 10), the openings in the platforms are sealed, new airfoil sockets are cut into the platforms, and the vane is reassembled.

La présente invention concerne un procédé de reconditionnement des roues de turbine d'un moteur à turbine impliquant la dépose et l'échange des profils. On peut abandonner la configuration d'origine de la roue à pièces de fonte monobloc ou à binômes soudés pour une configuration d'ensemble de composants en plusieurs parties comportant plusieurs segments de profil solidarisés aux couronnes intérieures et extérieures. L'ensemble de composants permet d'échanger des profils (8, 10) et/ou des couronnes (4, 6) pour des modèles améliorés de par le recours à de meilleurs alliages, à une meilleure géométrie physique, ou les deux. Il est possible d'apporter des modifications à la classe de roue d'ailettes sans qu'il y ait besoin de modifier le contour des profils par une opération de brasage ou d'autres procédés de modification des contours. En l'occurrence, on désolidarise les couronnes (4, 6) des profils (8, 10), on obture de façon étanche les orifices des couronnes, on creuse dans les couronnes les logements des nouveaux profils, et on remonte la roue de turbine.

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