NON-UNIFORM-DISTRIBUTION PRETIGHTENING-FORCE-CONTROLLABLE HIGH-SPEED MAIN SHAFT BASED ON PIEZOELECTRIC ACTUATOR AND CONTROL METHOD THEREOF

摘要

A non-uniform-distribution pretightening-force-controllable high-speed main shaft based on a piezoelectric actuator and a control method thereof. A bearing (2) is mounted on the periphery of a main shaft (1), the bearing (2) is fixed through a bearing support (3), and a temperature sensor (7) is mounted on the bearing support (3). A pretightening ferrule (6) is mounted on the outer ring of the main shaft (1), and a piezoelectric actuator (9) is mounted on the pretightening ferrule (6) through a mounting hole provided in the pretightening ferrule (6). A signal processing unit is connected between the piezoelectric actuator (9) and the temperature sensor (7), and the mounting position of the temperature sensor (7) is closed to the pretightening regulation and control point of the main shaft. After the temperature sensor (7) detects a temperature signal of the pretightening regulation and control point of the main shaft, the temperature signal is processed by the signal processing unit, and the pretightening force of the main shaft is adjusted by adjusting the pressure of the piezoelectric actuator (9). The high-performance high-speed main shaft under different working conditions is obtained by performing on-line regulation and control on the non-uniformly distributed pretightening force of the supporting bearing (2) of the main shaft.