Recent Repair Technology for Aero-Engine Blades
Many aero-engine blades are long-term operated in harsh environments. Due to high temperature
and pressure in operation, as well as many external impacts, blades may have various defects,
such as erosion, distortion, wear, cracks and impact dents. In terms of prolonging the service lives of
blades, repair is an inevitable choice since replacement is far more expensive. Along with the development
of the advanced manufacturing technology (AMT), repairing technologies of blades, which
have always mainly depended on the manual operation in the past several ten years, have been one hot research pot in the
aircraft maintenance. The research emphasis is to improve the automation level of repairing process. The reconstruction of
digital model of damaged blade, overlay welding and machining the welded excess are the three key technologies which
influence the automation level of repairing. In this paper, the approaches, methods and methodologies used for the three
technologies are reviewed as well as the comparisons between them are made. Meanwhile, the research directions are
pointed out. The future research works should be emphasized on reconstructing the damaged tip independent of design
model or unused blade, repairing the single-crystal blade with laser, repairing the blisk and improving the robot repairing
system. Here, We also discussed few related patents.
Keywords: Aero-engine, automation, blade, maintain, overhaul, reconstruct, repair.
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