Method of forming turbine blade root

Details Method of forming turbine blade root Method of forming turbine blade root

B - Operations, Transporting

23

P

B23P 15/02 (2006.01) B23H 9/10 (2006.01) B23K 35/36 (2006.01) B23K 35/362 (2006.01) B23P 13/00 (2006.01) C21D 7/06 (2006.01) F01D 5/30 (2006.01)

Patent

CA 2366325

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 beeding 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 impart to the surface small indentation or dimples and produce a compressed surface which resists further surface cracks.

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