Method for loosening blocking bolt of radial blade of rotor fixed on rotary drum of compressor of turboshaft engine during e.g. repair of blade, involves emitting ultrasonic waves into screw of bolt for vibrating screw to loosen screw

摘要

The method involves emitting ultrasonic waves into a radial screw (5) i.e. thumb screw, of a blocking bolt (4) at a frequency ranging between 20 kilohertz and preferably 30 kilohertz by an ultrasonic transmitter for vibrating the screw to loosen the screw, which is placed in a base of an annular groove (3) in an axially extending drum of a rotor (1) in a tightened state. A clearance is formed between a body of the screw and a tapping of the bolt. A tightening end of the screw is coated prior to emission of the ultrasonic waves. An independent claim is also included for a tool for loosening a blocking bolt of a blade of a turboshaft engine.