Method for extending the life of attachments that attach blades to a rotor
AssigneesSnecma Moteurs, Snecma Services
InventorsBenoît Jean Henri Berthelet, Francis Lucien Guy Chareyre, Willy Lionel Fradin, Hakim Hoffmann, Stéphane Michel Kerneis, Marie-Christine Marcelle Ntsama-Etoundi, Guillaume François Roger Simon
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Abstract
A method for extending the life of the attachments that attach blades to rotors, particularly for aerojet engines. Such a method is notable in that it employs intensive ultrasonic peening of the grooves and of the roots of the blades, this peening being performed with an Almen intensity at least equal to F8A, so as to increase the compressive prestress in the contact surfaces without increasing the roughness of these surfaces.
Claims8
A method for a rotor blade assembly comprising a rotor and a plurality of blades removably attached to said rotor, said rotor comprising a rim having a periphery to which each of said plurality of blades is attached by attachments comprising first and second components, said first component comprising a dovetail groove arranged in said periphery of said rim, and said second component comprising a root formed on said blade, said root being of a shape that complements said groove and being able to be fitted into said groove so as to attach said blade to said rim, a method for extending the life of said attachments by peening a surface of at least one of said first and second components so as to create compressive prestress at said surface, said method comprising the steps of:
- providing a sonotrode;
- forming a chamber which is delimited at least partly by said sonotrode and the surface which is to be peened;
- providing a plurality of beads in said chamber;
- and
- vibrating said sonotrode whereby said beads are mobilized in said chamber by the percussion of said sonotrode so that said beads are projected against said surface to effect ultrasonic peening of said surface with an Almen intensity at least equal to F8A.
Dependencies are inferred from the claim text.