Machine tool electric main shaft realizing supporting float by adopting hydrostatic bearing

Abstract

The electric machine tool main shaft with static pressure liquid bearing for floating bearing includes front bearing, main shaft and back bearing, and the main shaft has its two end supported separately onto the front bearing on the front bearing seat and the back bearing on the back bearing seat. Between the back bearing and the back bearing seat, there is back bearing floating sleeve, in the inner wall of the back bearing seat to contact with the back bearing floating sleeve, there are several oil cavities serving as static pressure bearings, and the oil cavities are communicated with the oil system vian oil path. The present invention can ensure the rotation precision and rigidity of the main shaft, and has simple structure, small amount of parts and easy machining.

Description

Technical field: [0001] The invention is a machine tool electric spindle capable of supporting floating, in particular to a machine tool electric spindle adopting a hydrostatic bearing for supporting floating. Background technique: [0002] In order to ensure the service life and technical performance of the high-speed electric spindle of the machine tool, usually the front and rear supports of the electric spindle of the machine tool must work under a certain amount of pre-interference. However, when the machine tool is working at high speed, the bearing friction heats up and the motor is installed. Work heating will cause the spindle to elongate and deform, destroy the original pre-interference state, and even cause the bearing to burn. In order to avoid this situation, one of the supports of the electric spindle must be set to float axially, that is, through the slight displacement of the support in the axial direction, the additional load caused by the thermal deformation of ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly two structures for floating bearings. One is a sliding sleeve with a gap fit. This structure is simple, but there is a gap in the radial direction, which will affect the rotation accuracy of the main shaft and the stiffness of the main shaft; the other is a linear rolling bearing sleeve. , its mechanism is ideal, but due to the complex structure and the increase in the number of parts, it will greatly increase the difficulty of machining the spindle support hole. If the mutual position accuracy of the bearing holes cannot be well guaranteed, the spindle support will also be stuck and the original bearing will be damaged. Pre-interference

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