Laser machining cooling holes in gas turbine components

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 26/00 (2006.01) B23K 26/38 (2006.01) F01D 5/18 (2006.01) F01D 25/12 (2006.01)

Patent

CA 2436912

The present invention provides a method of laser machining a cooling hole in a hollow gas turbine component, the cooling hole including a circular cross section metering hole and a diffuser with an opening which extends from a shape locus in the metering hole to a trapezoidal cross section opening by firing a series of laser pulses at an acute angle at the outer surface of the component toward the shape locus to create the diffuser opening, with the laser pulses penetrating the component outer surface up to but not substantially beyond the shape locus, then firing the laser through the shape locus and the inner surface of the component to create the metering hole having a circular cross section. Alternatively, the initial laser pulses are fired to create the central portion of the diffuser opening, then firing the laser to create the metering hole, followed by firing the laser along the peripheral portion of the diffuser opening.

L'invention concerne un procédé d'usinage laser d'un trou de refroidissement dans un composant creux de turbine à gaz, ce trou comprenant un passage calibré, de section circulaire, ainsi qu'un diffuseur doté d'une ouverture s'étendant entre un point à partir duquel la forme du passage change, dans ce passage, et une ouverture de section trapézoïdale, cet usinage consistant à envoyer une série d'impulsions laser qui forment un angle aigu avec la surface extérieure du composant et sont dirigées vers le point de changement de forme, de manière à créer l'ouverture du diffuseur, les impulsions laser pénétrant dans la surface extérieure du composant jusqu'au point de changement de forme, mais pas sensiblement au-delà de celui-ci, puis à envoyer un faisceau laser à travers le point de changement de forme et la surface intérieure du composant, afin de créer le passage calibré de section circulaire. Dans un autre mode de réalisation, on envoie trois impulsions laser initiales pour créer la portion centrale de l'ouverture du diffuseur, puis on envoie un faisceau laser pour créer le passage calibré, et on dirige ensuite ce faisceau le long de la portion périphérique de l'ouverture du diffuseur.

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