Turbine high pressure inner cylinder thermometer hole machining location device and use method thereof

The invention provides a turbine high pressure inner cylinder thermometer hole machining location device and a use method thereof. The location device and the use method solve the problem that a thermometer hole of a high pressure inner cylinder and a through hole of an outer cylinder of the turbine can be staggered easily after being machined. The location device is formed by a stepped shaft and a reducer, the reducer is inserted into the through hole of the high pressure outer cylinder, and then the stepped shaft is inserted into the reducer. After an annular stamp on the thermometer hole lug face of the high pressure inner cylinder is formed by the pigment spread on the end face of a conical hole pipe of the reducer, and machining can be conducted according to the stamp. The location device can ensure the machining position, effectively ensures the machined holes of the outer cylinder (to prevent galling) and is simple in structure and low in manufacture cost.