Method of forming turbine blade root

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 5/30 (2006.01) B23H 1/00 (2006.01) B23P 13/00 (2006.01) B24C 1/10 (2006.01) C21D 7/06 (2006.01)

Patent

CA 2431889

The present invention relates to a process for forming the root of a turbine blade using the EDM method. EDM machining of the root is done in a manner that any re- cast layer left behind is less than 1 micron. After EDM machining the turbine blade is subjected to MPI to check for depth or presence of surface cracks. A liquid tracer coating is then applied to the root, which allows the ability of the next process to be verified as complete. The root is then subjected to glass beading to remove any re-cast and insure the surface finish prior to shot peening is consistent and contains no scratch marks or machine marks. The root is then subjected to shot peening to reduce residual tensile stresses by imparting to the surface small indentations or dimples and produce a compressed surface which resists further surface cracks.

L'invention concerne un procédé de fabrication de l'emplanture d'une aube à turbine au moyen du procédé EDM. L'usinage EDM de l'emplanture est effectué de tel manière que n'importe quelle couche refondue laissée derrière ne soit inférieure à 1 micron. Après l'usinage EDM, l'aube de turbine est soumise à un contrôle magnétoscopique afin de vérifier la profondeur ou la présence de fissures superficielles. Un revêtement traceur liquide est ensuite appliqué sur l'emplanture, ce qui permet de vérifier que le processus suivant est terminé. L'emplanture est ensuite soumise au roulage de verre afin d'ôter n'importe quelle refonte et de s'assurer que la finition de la surface, avant le grenaillage de précontrainte, est régulière et ne contient aucune marque de fissure ou marque de machine. L'emplanture est ensuite soumise à un grenaillage de précontrainte afin de réduire l'effort de traction par réalisation, dans la surface, de petites indentations ou dépressions, et de fabriquer une surface comprimée qui résiste à d'autres fissures superficielles.

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