Controllable air static pressure radial bearing system

Abstract

The invention discloses a controllable air static pressure radial bearing, and relates to a vibration detection and control system in the working process of an air static pressure main shaft. The system is provided with an air static pressure main shaft system, four piezoelectric ceramics, four eddy current sensors and an upper computer. The four piezoelectric ceramics are installed on a bearing shell through a clamping device, the other ends of the piezoelectric ceramics act on bearing bushes, elastic supporting devices are arranged in gaps between the bearing bushes at the two ends of the bearing and the shell, the four eddy current sensors are vertically distributed at the two ends of the main shaft in pairs, and the eddy current sensors receive vibration signals. The vibration signals are converted into corresponding control voltage signals by the upper computer to act on the piezoelectric ceramics, and the piezoelectric ceramics generate corresponding displacement to push the movable bearing bushes to extrude an air film to generate air film force to inhibit vibration of the main shaft.

Description

technical field [0001] The invention relates to a novel controllable aerostatic radial bearing, in particular to a controllable aerostatic radial bearing aimed at reducing the radial vibration of an aerostatic spindle rotor. Background technique [0002] The aerostatic spindle has the advantages of high working precision, low heat generation, and small friction, and can be used in the field of precision and ultra-precision machining. However, since the lubricating medium of the aerostatic spindle system is air, the aerostatic spindle also has the disadvantages of low bearing capacity and rigidity. Therefore, the aerostatic spindle is easily affected by external loads, self-weight and other exciting forces during operation, resulting in unnecessary vibration, resulting in reduced machining accuracy of the aerostatic spindle and unsatisfactory workpiece forming quality. Therefore, it is necessary to use some kind of measurement and control technology, that is, to use actuator...

AI Technical Summary

Problems solved by technology

As for the research on suppressing the vibration of the spindle, more is carried out from the aspects of optimizing the structure of the spindle system and the contact force relationship between the tool and the spindle, while the research on suppressing the vibration of the spindle by using the control system to drive the actuator is not very complete. Therefore, it is very meaningful to design a device that can effectively control the vibration of the spindle

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