Hydrostatic semi-spherical bearing shafting and precision machine tool

Abstract

The invention relates to a hydrostatic semi-spherical bearing shafting and a precision machine tool. The hydrostatic semi-spherical bearing shafting comprises at least one hydrostatic semi-spherical bearing and a rotating shaft; the hydrostatic semi-spherical bearing is provided with a supporting seat, an accommodating assembly and a rotating piece; the accommodating assembly comprises an accommodating piece and a plurality of hydrostatic bushings; the accommodating piece is provided with a plurality of hydrostatic channels through which fluid passes; the hydrostatic bushings are arranged at openings of first concave cavities; the openings of the hydrostatic concave cavities face a concave semi-spherical surface; the hydrostatic bushings are arranged on the concave semi-spherical surface along at least one arrangement plane which is a plane perpendicular to the rotation axis of the rotating piece; and the supporting seat is provided with a supporting seat inner cavity matched with theouter surface of the accommodating piece. According to the involved hydrostatic semi-spherical bearing shafting, a convex sphere does not make contact with a concave sphere when rotating, and comparedwith a hydrostatic cone bearing, the hydrostatic semi-spherical bearing has a better concentric matching degree, so that the dynamic rotating precision of the rotating shaft on a rotating pair can beimproved by adopting a gas or liquid hydrostatic technology.

Description

Technical field [0001] The invention belongs to the field of machinery, and specifically relates to a static pressure hemispherical bearing shaft system and a machine tool. Background technique [0002] Most of the rotating pairs in the prior art are in a contact state when rotating, and the rotating accuracy and efficiency are not high. [0003] Bearings that use gas or liquid static pressure technology combined with a spherical structure are currently one of the effective ways to improve spindle rotation accuracy. [0004] According to the basic principle of gas (air) or liquid (oil) static pressure technology, the liquid or gas medium enters into the multiple chambers of the concave spherical surface of the hemispherical bearing. When the convex ball rotates, the medium flows from the multiple chambers. The dynamic pressure is formed. The higher the speed of the convex ball, the higher the density of the medium, the smaller the gap between the concave and convex balls, the greate...

AI Technical Summary

Problems solved by technology

[0004] According to the basic principle of gas (air) or liquid (oil) static pressure technology, the liquid or gas medium enters the multiple chambers of the concave spherical surface of the hemispherical bearing respectively. When the convex ball rotates, the medium flows from the multiple chambers. Dynamic pressure is formed. The higher the speed of the convex ball, the higher the density of the medium, the smaller the gap between the concave and convex balls, the greater the dynamic pressure. Because there is a certain gap between the concave and convex spherical surfaces, the convex ball floats and is in a non-contact state when rotating. However, the precision machining efficiency of the spherical surface of the ball bearing is very low, and the processing cost is high, which affects its popularization and application

Images