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Gas-lubricated bearings are mainly used in the machine tool spindle bearing, the axis of the workpiece, the tool axis, the wheel shaft. Machine tool spindle bearings generally use the the gas hydrostatic bearing and hydrodynamic hybrid bearing two. Small high-speed spindle wave foil bearings can be used. Aerostatic bearing the most widely used in the machine, which is the most common to the of Orifice Compensated torus throttle bearing. Porous aerostatic bearing more and more in recent years to be used for machine tool active static pressure mixed lubricated bearings. Floating Ring Hybrid gas bearings is the newly developed high-speed gas-lubricated bearings for high-speed spindle bearing promising.

The ultra-high-speed air bearing inner circle grinding head grinding speed precision grinding of small holes and tiny holes. Using air bearings machining accuracy by 2-3 orders of magnitude, the precise mirror finish.

A: the advantages of gas lubricated
(1) high precision

Gas film has errors homogenization, its accuracy is two orders of magnitude than the rolling bearing, and little vibration, low noise.

(2) the friction loss is small

The gas viscosity is only one thousandth of the lubricating oil viscosity, so the friction torque due to friction of the gas membrane low-three orders of magnitude than the oil film.

        (3) non-polluting

Lubricating gas is usually air or inert gas and discharged into the atmosphere does not produce pollution. Bearing little vibration, low noise, nor does it constitute environmental pollution.

       (4) high-speed

The small-sized helium turboexpander speed has reached 650 000r/min, the line speed for 238M / s, the dn value calculation has reached 455x106mm · r / min.

(5) Applicable temperature range is wide, can antigen sub radiation

The high temperature up to 300-500 ℃, low temperature the 10K gas bearing still work.

(6) long life

Aerostatic bearing metal direct contact with the theory of infinite life. Consider other conditions, should generally be in more than 104h. Dynamic pressure gas bearing start-stop instant metal friction life by the certain influence, but also more than 3000h.

The disadvantage of gas-lubricated bearings

(1) poor reliability

The one hand, the gas-lubricated bearings easily instability common pneumatic hammer vibration and whirl instability. The other hand, gas-lubricated bearings catching axle or killed phenomenon also occurred.

    (2) carrying capacity

Gas-lubricated bearings and similar oil-lubricated bearings than the carrying capacity of approximately 1 to 2 orders of magnitude lower. Carrying capacity per unit area, oil lubricated bearings generally (0.5 ~ 2) MPa, gas lubricated bearings only (0.02 to 0.04) MPa.

(3) The requirements of harsh working conditions

Gas-lubricated bearings require high cleanliness of the work environment, and strictly abide by the rules, in order to ensure that the bearing to work properly, and not an accident. For this reason, to some extent limit its wide application and commercialization.
 
       (4) manufacturing high precision, expensive

Due to the air film is thin, generally between a few microns to tens of microns, so the requirements for a higher manufacturing precision of parts, improving the cost. In addition, the special requirements of the processing of the spiral groove, the throttling orifice and the porous material, etc., increases the manufacturing difficulty and cost.