METHOD AND APPARATUS FOR IMPROVED TURBINE BELLYBAND ROTOR SEAL MACHINING, INSTALLATION AND LIFE

摘要

A method and apparatus for improved turbine bellyband rotor seal machining, installation and life are disclosed. A fixture is provided which can be temporarily attached to the turbine disks in a position straddling the gap between the disks, without destacking the turbine rotor. The fixture accepts power tools including a drill and a mill, and positions the power tools to drill and grind a rectangular slot into the disks, where the slot has the exact size and shape needed to receive an anti-rotation block which is integral to the replacement bellyband. Measuring tools are also provided which enable precise location of each of the four slots which must be machined in the disks. The resulting slots have a uniform size and shape, and are equally spaced around the circumference of the disk, thereby facilitating installation of the service bellyband from four identical segments.

主权项

1. A tool set for preparing two adjacent rotor disks in a gas turbine for installation of a bellyband rotor seal, said tool set comprising:
a machining fixture configured to cut a slot into the disks, said fixture comprising a body including a recessed pocket on a top surface and an opening through the body central to the pocket, a first drilling insert configured to fit in the pocket in the body, a second drilling insert configured to fit in the pocket in the body, a milling insert configured to fit into the pocket in the body, a pair of alignment pins protruding from a bottom surface of the body, and a pair of toggle bolts passing through the body and extending beyond the bottom surface of the body, where the machining fixture is mounted onto the disks using the alignment pins and the toggle bolts and the slot is cut using the first and second drilling inserts and the milling insert in sequence; a half-circumference measurement band including a fitting at one end, where the fitting is sized to fit into the slot which has been cut into the disks, and the half-circumference measurement band is sized to extend halfway around a circumference of the disks; and a quarter-circumference measurement band including a fitting at one end, where the fitting is sized to fit into the slot which has been cut into the disks, and the quarter-circumference measurement band is sized to extend one-quarter of a distance around the circumference of the disks.