| 摘要 |
PURPOSE:To prolong the remaining life of a shrink fitting type rotor and to shorten a required repairing time by removing a more outside part from an arbitrary position of the outer peripheral side than the outer peripheral side tip part of a crack when the crack is produced on an inner diameter side bottom part of a shrink fitting disc. CONSTITUTION:In a shrink fitting type rotor used for a steam turbine for nuclear power, etc., when any crack 15 is produced in an inner diameter side bottom part of a shrink fitting disc 17, e.g., in a key groove 14, a disc 9 is cut at a position on the more outer peripheral side than the tip on the outer peripheral side of the crack 15, namely, at the interface between a disc web part 16 and a disc hub part 17 to remove the disc web part 16 and a bucket 10. For a cutting method, for example, a melting method is utilized. Hereby, it is made possible to prolong the remaining life of the shrink fitting type rotor and to perform a rotor balancing adjustment after cutting and removing the disc 9 in a short period of time. |
