| 摘要 |
A method for drilling or cutting a pin ( 31 ) surrounded by solid material ( 32 ) includes the use of a water jet tool ( 10 ) having a nozzle ( 11 ) that is arranged at an angle with respect to a main body ( 12 ) of the water jet tool ( 10 ). The water jet is directed over a portion of the surface of the pin ( 31 ), and removes that portion thereby fragmenting the pin ( 31 ). In order to minimise damage to the surrounding material, the portions removed touches the interface between the pin and the surrounding solid material at a minimal number of points and over a minimal extent of the interface. The method is applicable in particular to the removal of pins ( 31 ) used in a press-fit for the securing of blades ( 3 ) on a turbine rotor ( 1 ). The method facilitates "in situ" removal of pins within a confined space in a short time and at reduced cost.
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