Development of Rework Procedure for AA7076-T6 P-3/C-130 Propeller Taper Bore Using Low Plasticity Burnishing (LPB)

Author:  Hornbach, Scheel, Prevey
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 261-266)
Doc ID:  2011043
Year of Publication:  2011
Abstract:  
Abstract Low plasticity burnishing (LPB) has been applied to the internal taper bore of the P-3 and C-130 propeller blade as a replacement to the current shot peen and reaming rework process. LPB processing of the P-3 propeller blade internal taper bore was performed with a 6-axis Fanuc robot. LPB produced a smooth surface finish, eliminating the need for reaming and further machining for proper contact between the bronze bushing and the internal taper bore. Results are shown that demonstrate the LPB process is equivalent or superior to the current shot peen + reaming process in terms of high cycle fatigue, residual stress, and surface roughness. LPB processing provides substantial rework cost savings, extended blade life, and superior performance. Keywords Stress Corrosion Cracking, Fatigue, Residual Stress, Low Plasticity Burnishing.