A Gas Static Pressure Spindle Based on Acoustic Suspension and Variable Throttling

Abstract

A gas static pressure spindle based on acoustic levitation and variable throttling, including a spindle system, a control system, and an air source system; the spindle system includes a gas static pressure spindle, a shaft sleeve, and a shaft sleeve fixing sleeve; There is a shaft sleeve, the shaft sleeve is equipped with a shaft sleeve fixed sleeve, and the shaft sleeve is provided with a plurality of throttle holes; the air source system is used to form high-pressure gas, and the high-pressure gas passes through the throttle hole between the shaft sleeve and the gas static pressure spindle The small gap forms an air film; the control system includes an acoustic suspension bearing, a throttle control valve and a displacement sensor; the throttle control valve is set on the throttle hole, the acoustic suspension bearing is set on the left and right ends of the shaft sleeve, and the displacement sensor is set on the shaft Put it on; the displacement sensor is sequentially connected to the signal collector and the industrial computer, and the output end of the industrial computer is electrically connected to the throttling control valve and the acoustic suspension bearing. The invention improves the bearing capacity and rigidity of the main shaft, and can still ensure the stable operation of the main shaft while realizing the active control of the frequency domain error of the main shaft.

Description

technical field [0001] The invention relates to an aerostatic spindle based on acoustic levitation and variable throttling. Background technique [0002] Due to its advantages of high precision, high speed, almost no friction and pollution, the aerostatic spindle is widely used in the field of nano-precision machining of high-performance parts. The processing surface of high-performance parts has the requirement of frequency domain error (referring to the spatial frequency and amplitude of the error), and the frequency domain error of the aerostatic spindle (referring to the time domain frequency and amplitude of the motion error) is very important for the processing surface of such parts. The frequency domain error has an important influence. Therefore, it is very important to realize the active control of the frequency domain error of the gas hydrostatic spindle under the premise of ensuring the high precision and stable operation of the spindle. However, the traditional ...

AI Technical Summary

Problems solved by technology

However, the traditional gas static pressure spindle (take the small hole throttling gas static pressure spindle as an example), due to its own limitations, it is difficult to achieve effective active control

Once the spindle is manufactured, the number and distribution of the orifices generally cannot be changed. The active control of adjustable parameters such as air supply pressure alone can easily cause the instability of the spindle, and the frequency domain error of the spindle is difficult to achieve active control under the premise of stable operation.

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