Method of repairing a threaded generator rotor blower assembly

摘要

A method of repairing a generator blower hub assembly ( 12 ) and rotor blade ( 10 ) removed from the generator blower hub assembly ( 12 ) where the rotor blade ( 10 ) has fatigued material in threads of a threaded blade root ( 14 ). The method may include removing ( 32 ) at least a portion of the fatigued material to form the blade root ( 14 ) to a first or new diameter. Threads may be formed ( 36 ) on the diameter of the blade root ( 14 ) using a roll forming process. A collar ( 20 ) may be secured within a threaded hole ( 16 ) formed in the generator blower hub assembly ( 12 ) where the collar ( 20 ) includes internal threads ( 35 ) for receiving the threads formed on the diameter of the blade root ( 14 ), which may be threaded into the collar ( 20 ). Collar ( 20 ) may be fabricated of steel alloy and include relief groove ( 40 ) for improving the fatigue resistance of the threaded blade root ( 14 ) when reassembled into the generator blower hub assembly ( 12 ).