A porous and microporous combined throttle gas hydrostatic turning electric spindle

Abstract

The invention discloses a porous and microporous combined throttle gas hydrostatic turning electric spindle, which includes an air-floating support assembly; the air-floating support assembly includes a rotating shaft, and the rotating shaft is sequentially provided with rotating shafts along the direction from one end to the other end of the rotating shaft. The axial support section, the first support section in the radial direction of the rotating shaft and the second support section in the radial direction of the rotating shaft are provided with axial restrictors on both sides of the axial support section of the rotating shaft. Radial throttles are arranged on the radial second support sections; the outer side of the axial throttle is axially and the outer side of the radial throttle is radially provided with a plurality of annular air supply grooves , at least one of the air supply grooves is provided with a plurality of transition air supply holes, and the transition air supply holes are provided with throttling micro-holes. Through the combined throttling effect of the inherent fine pores of the porous material and the additional throttling pores, the support air film can obtain greater bearing capacity and stiffness, and improve the static and dynamic characteristics of the turning spindle.

Description

technical field [0001] The invention relates to the technical field of precision cutting, in particular to a porous and microporous combined throttle gas hydrostatic turning electric spindle. Background technique [0002] The gas static pressure bearing is lubricated and supported by the gas film formed by the external pressurized gas in the gap of the rotating pair. Due to the low viscosity of the gas and the homogenization effect of the gas film on the manufacturing error of the supporting surface of the rotating pair, the gas static pressure bearing is It has the advantages of high motion accuracy, fast rotation speed, low operating power consumption, less heat generation, and long service life, and is currently the primary choice for ultra-precision lathe spindles. In order to carry the part for rotary motion and resist the dynamic cutting forces during machining, the ultra-precision lathe aerostatic spindle needs to have sufficient bearing capacity and stiffness. The t...

AI Technical Summary

Problems solved by technology

However, the pore diameter of the tiny pores inside the existing porous material is very small, the pore diameter is generally a few microns or even smaller, the material permeability is small, and the flow resistance is large, resulting in low bearing capacity and low stiffness of the bearing.

Furthermore, the distribution of tiny pores inside the porous material is chaotic, the flow channel bends irregularly, the flow of pressurized gas is longer, and the bearing responds slowly to dynamic loads

In addition, the tiny pores of porous materials are easy to block during material processing and bearing operation, resulting in a decrease in the stiffness of the porous throttling aerostatic spindle or even a locking phenomenon, which affects the reliability of ultra-precision lathes

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