Non-uniform distribution preload controllable high-speed spindle based on piezoelectric actuator and its control method

Abstract

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.

Description

technical field [0001] The invention belongs to the application field of performance regulation and control of high-speed spindle rolling bearings, and relates to a high-speed spindle with non-uniformly distributed pretightening force controllable based on a piezoelectric actuator and a control method thereof. Background technique [0002] Rolling bearings are used as internal rotating support elements of high-speed spindles, and their service performance directly affects the dynamic performance of high-speed spindles, especially under the complex service conditions of the spindle system, such as the high-speed light-load and low-speed heavy-load replacement conditions of the spindle, requiring spindle bearings The service performance under different conditions can be controlled to meet the requirements of the dynamic performance of the spindle, so as to ensure the high precision and high reliability of high-speed machining. Therefore, how to adjust the service performance o...

AI Technical Summary

Problems solved by technology

Simply applying a uniformly distributed axial preload to the bearing cannot effectively eliminate the non-uniform distribution of axial and radial clearances, nor can it meet the requirements of non-uniform distribution of working loads of high-speed spindles under certain working conditions , which will inevitably require exploring the application method and size of the rolling bearing preload from a more refined perspective, so that the service performance of the rolling bearing can be "excellent".

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