Apparatus for broaching repair of turbine rotor steeples
View Patent ↗A broaching apparatus includes; a broach having a cross-section corresponding to a geometry of slot between adjacent steeples of a turbine rotor, and a mechanism which moves the broach through the slot in a direction substantially parallel to a direction of extension of the slot.
1. A method for repairing a crack in a turbine rotor, the method comprising:
securing a fixture assembly to the turbine rotor;
coupling an actuator frame to the fixture assembly;
coupling an actuator to the actuator frame;
coupling a first pulley to an end of the actuator opposite the actuator frame;
disposing a chain anchor on one of the fixture assembly and the actuator frame;
coupling a first end of a chain to the chain anchor, a middle section of the chain passing through the first pulley; and
coupling a second end of the chain to a broach, the broach having a cross-section corresponding to a geometry of a slot between two adjacent steeples in a direction of extension of the slot; and
removing material surrounding the crack by moving the broach through the slot in a direction substantially parallel to a direction of extension of the slot wherein a motion of the actuator is transferred to the broach via the chain.
2. The method of claim 1 , wherein the broach is disposed on a disk and is pulled through the slot by a motion of the actuator, in a curved path.