Aerogel lubricated ultra-precision aerostatic bearing

Abstract

An aerosol lubricated ultra-precision gas static pressure bearing belongs to the field of ultra-precision machining equipment technology. It addresses the problems of bearing seizure and corrosion that often occur when using gas as a lubricant in gas static pressure bearings. The gas static pressure bearing body has an air passage, and an oil mist lubrication system is connected to this passage. Compressed air is generated into an oil mist form by the oil mist lubrication system and then introduced into the gas static pressure spindle through the air passage, providing lubricant to the spindle. The presence of oil mist in the compressed air reduces the air gap thickness of the gas static pressure bearing and increases the damping of the extrusion die. However, due to the discontinuous nature of the oil mist, it does not significantly increase bearing heat generation, greatly improving the stability of the air bearing during operation. The presence of oil mist in the compressed air also prevents the gas static pressure bearing from seizing and prevents corrosion of its components.

Description

Technical Field

[0001] This invention belongs to the field of ultra-precision machining equipment technology, specifically relating to an ultra-precision gas static pressure bearing with air mist lubrication. Background Technology

[0002] In the field of ultra-precision machining equipment, the precision requirements for machined parts are becoming increasingly stringent. Air bearings, due to their advantages such as low friction, low temperature rise, high load-bearing capacity, and high precision, are widely used in ultra-precision machining equipment. Traditional air bearings use gas as a lubricant and mostly employ a small-orifice throttling design. A constant pressure is provided by a gas pressure source, allowing compressed gas to form a lubricating film at the coupling surface between the shaft and the bushing after passing through the throttling orifice. This lubricating film completely floats the shaft and its load, providing support and rigidity. Because the lubricating film has an error-averaging effect, it reduces the impact of machining errors in bearing components on the rotational accuracy of the gas hydrostatic bearing. When the load on the bearing changes, the gap between the shaft and the bushing changes. Due to the principle of gas pressure division, the pressure is greater where the gap between the shaft and the bushing is smaller, thus ensuring that the shaft remains centered in the bushing. The small-orifice throttling design of air bearings is relatively simple in structure, easy to implement, and has stable performance; therefore, small-orifice throttling gas hydrostatic bearings are widely used in the field of ultra-precision machining equipment.

[0003] Although gas static pressure bearings have many advantages mentioned above, they also have low stiffness, making them prone to seizing under impact loads during use. This can damage the coupling surface between the bearing shaft and bushing, rendering the bearing unusable. Furthermore, the use of gas as a lubricant results in low damping. Additionally, when not in use, external water vapor can cause corrosion of the bearing components. Summary of the Invention

[0004] In order to solve the problems of bearing seizure and corrosion that easily occur when using gas as a lubricant in gas static pressure bearings, this invention provides an aerosol lubricated ultra-precision gas static pressure bearing that can improve the damping of the gas static pressure bearing and prevent corrosion during non-use periods.

[0005] The technical solution adopted in this invention is: an ultra-precision gas static pressure bearing with aerosol lubrication, comprising an oil mist lubrication system and a gas static pressure bearing body. An air passage is provided in the gas static pressure bearing body. The oil mist lubrication system is connected to the air passage of the gas static pressure bearing body. Compressed air is generated into oil mist compressed air through the oil mist lubrication system, and then introduced into the gas static pressure spindle through the air passage to provide lubricant for the gas static pressure spindle.

[0006] Compared with the prior art, the present invention has the following advantages:

[0007] 1. Compressed air is lubricated by an oil mist lubrication system to generate oil mist, which is then mixed into the compressed air and introduced into the gas static pressure spindle. The presence of oil mist in the compressed air can reduce the air gap thickness of the gas static pressure bearing and increase the damping of the gas static pressure bearing extrusion die. However, due to the discontinuity of the oil mist, it does not significantly increase the bearing heating, thus greatly improving the stability of the air bearing during operation.

[0008] 2. The presence of oil mist in compressed air can prevent the gas hydrostatic bearing from seizing.

[0009] 3. The presence of oil mist in the compressed air can prevent corrosion of various bearing components.

[0010] 4. This invention can overcome the problem of seizing in gas hydrostatic bearings and also avoid the problem of excessive heat generation in liquid hydrostatic bearings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the axial cross-sectional structure of the present invention;

[0012] Figure 2 This is a schematic diagram of the radial cross-sectional structure of the present invention;

[0013] Figure 3 This is a three-dimensional structural schematic diagram of the present invention;

[0014] The components are: 1. Water separator and air filter; 2. Pressure regulating valve; 3. Generator; 4. Copper bushing; 5. Bearing base; 6. Bushing; 7. Sealing plug; 8. Spoke plate; 9. Small orifice throttle; 10. Main shaft rotor; 11. Axial air passage shaft one; 12. Axial air passage shaft two; 13. Radial air passage diameter one; 14. Axial air passage shaft three; 15. Radial air passage diameter two; 16. Radial air passage diameter three; 17. Radial air passage diameter four; 18. Radial air passage diameter five; 19. Radial air passage diameter six; 20. Axial air passage shaft four. Detailed Implementation

[0015] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0016] Reference Figures 1-3 As shown, the present invention discloses an ultra-precision gas static pressure bearing with a mist lubrication system, comprising an oil mist lubrication system and a gas static pressure bearing body. An air passage is provided in the gas static pressure bearing body. The oil mist lubrication system is connected to the air passage of the gas static pressure bearing body. Compressed air is generated into oil mist compressed air through the oil mist lubrication system, and then introduced into the gas static pressure spindle through the air passage to provide lubricant for the gas static pressure spindle.

[0017] The oil mist lubrication system includes a water separator and air filter 1, a pressure regulating valve 2, and a generator 3 connected in sequence. The generator 3 is connected to the air passage inside the gas static pressure bearing body. Compressed air is filtered by the water separator and air filter 1 before entering the generator 3. The generator 3 atomizes the lubricating oil inside the compressed air into small particles of 1-3 micrometers. The atomized lubricating oil mixes with the compressed air and enters the air passage of the gas static pressure bearing body. The water separator and air filter 1 filters out moisture and other impurities contained in the compressed air.

[0018] The gas static pressure bearing body includes a bearing base 5, a main shaft rotor 10, a bushing 6, a copper bushing 4, a spoke plate 8, and multiple orifice throttles 9. The main shaft rotor 10 is a hollow cylindrical structure with an annular thrust plate, divided into a long shaft end and a short shaft end by the annular thrust plate. The copper bushing 4 is fitted onto the outer cylinder of the long shaft end of the main shaft rotor 10. The bushing 6 is fitted onto the outer cylinder of the copper bushing 4. The bushing 6 is a hollow cylindrical structure with an annular flange at the top. The bushing 6 has axial and radial air passages inside. The bearing base 5 is fitted onto... The bushing 6 has a cylindrical end and is fixed to the bearing base 5 by bolts. The spoke plate 8 is a hollow cylindrical structure with grooves. The spoke plate 8 is fitted onto the outer cylinder and annular thrust plate of the short shaft end of the main shaft rotor 10. The spoke plate 8 and the bushing 6 fit together to fasten the main shaft rotor 10 into their inner cavities. The bushing 6 and the long shaft end of the main shaft rotor 10 fit together to form the radial bearing part of the gas static pressure bearing. The spoke plate 8, the annular thrust plate structure of the main shaft rotor 10, and the annular flange at the top of the bushing 6 form the thrust bearing part of the gas static pressure bearing.

[0019] Throttling device mounting holes are arranged on the copper bushing 4, as well as on the upper surface of the flange of the bushing 6 where it connects with the annular thrust plate of the main shaft rotor 10 and on the lower surface of the circular groove of the spoke plate 8. A small hole throttle 9 is installed in each throttle device mounting hole. The air passage is connected to the main shaft rotor 10 through the throttle device mounting hole to provide oil mist compressed air to the main shaft rotor 10.

[0020] The gas passage within the gas hydrostatic bearing body includes:

[0021] Several axial air passage shafts 11, several radial air passage diameters 13, and several axial air passage shafts 14 are evenly distributed circumferentially on the spokes 8. Each radial air passage diameter 13 is interconnected with and corresponds one-to-one with each axial air passage shaft 11 and axial air passage shaft 14. Furthermore, a small-hole throttle 9 is provided at the end of the axial air passage shaft 11 near the main shaft rotor 10, where a throttle mounting hole is located.

[0022] A plurality of axial air passage shafts 12, radial air passages 15, radial air passages 16, radial air passages 17, radial air passages 18, radial air passages 19, and axial air passage shafts 20 are all evenly distributed circumferentially on the bushing 6. The end of axial air passage shaft 12, near the surface of the main shaft rotor 10, has a throttle mounting hole with a small-hole throttle 9. Axial air passage shafts 14 and radial air passages 15 are connected to the shaft... The radial airway shaft 12 corresponds to and is connected in sequence. The radial airway diameter 15 corresponds to and is connected to the axial airway shaft 20. The axial airway shaft 20 is connected to and connects the radial airway diameter 16, the radial airway diameter 17, the radial airway diameter 18, and the radial airway diameter 19. The radial airway diameter 16, the radial airway diameter 17, the radial airway diameter 18, and the radial airway diameter 19 are respectively connected to the corresponding throttle mounting holes on the copper bushing 4.

[0023] The inner surface of the bushing 6 has four annular grooves, and the radial air passages 16, 17, 18, and 19 are connected by their respective annular grooves.

[0024] A sealing plug 7 is provided on the side of the radial air passages 16, 17, 18, and 19 near the bearing base 5. A sealing plug 7 is also provided at the end of the radial air passages 15 and at the end of the axial air passage 20, thereby ensuring that the air supply path of the entire air bearing is closed.

[0025] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An ultra-precision gas hydrostatic bearing with aerosol lubrication, characterized in that: The device includes an oil mist lubrication system and a gas static pressure bearing body. The gas static pressure bearing body has an air passage. The oil mist lubrication system is connected to the air passage of the gas static pressure bearing body. Compressed air is generated into an oil mist form through the oil mist lubrication system, and then introduced into the gas static pressure spindle through the air passage to provide lubricant for the gas static pressure spindle. The gas static pressure bearing body includes a bearing base (5), a main shaft rotor (10), a bushing (6), a copper bushing (4), a spoke plate (8), and multiple orifice throttles (9); the main shaft rotor (10) is a hollow cylindrical structure with an annular thrust plate, and is divided into a long shaft end and a short shaft end by the annular thrust plate. The copper bushing (4) is fitted on the outer cylinder of the long shaft end of the main shaft rotor (10), and the bushing (6) is fitted on the outer cylinder of the copper bushing (4). The bushing (6) is a type of bushing with an annular ring at the top. The bearing base (5) is fitted onto the cylindrical end of the bushing (6), and the bushing (6) is connected and fixed to the bearing base (5). The spoke plate (8) is fitted onto the outer cylinder of the short shaft end of the main shaft rotor (10). The bushing (6) and the long shaft end of the main shaft rotor (10) cooperate to form the radial bearing part of the gas static pressure bearing. The spoke plate (8), the annular thrust plate structure of the main shaft rotor (10), and the annular flange at the top of the bushing (6) form the thrust bearing part of the gas static pressure bearing. Throttling hole mounting holes are arranged on the copper bushing (4), the upper surface of the flange of the bushing (6) at the junction with the annular thrust plate of the main shaft rotor (10), and the lower surface of the spoke plate (8). A small hole throttle (9) is installed in each throttle hole. The air passage is connected to the main shaft rotor (10) through the throttle hole to provide oil mist compressed air to the main shaft rotor (10).

2. The ultra-precision gas hydrostatic bearing with aerosol lubrication according to claim 1, characterized in that: The oil mist lubrication system includes a water separator (1), a pressure regulating valve (2), and a generator (3) connected in sequence. The generator (3) is connected to the air passage inside the gas static pressure bearing body. Compressed air is filtered by the water separator (1) and then enters the generator (3). The generator (3) atomizes the lubricating oil inside the compressed air. The atomized lubricating oil mixes with the compressed air and enters the air passage of the gas static pressure bearing body.

3. The ultra-precision gas hydrostatic bearing with aerosol lubrication according to claim 1, characterized in that: The gas passage within the gas hydrostatic bearing body includes: Several axial airway shafts (11), several radial airway diameters (13), and several axial airway shafts (14) are evenly distributed on the spokes (8) along the circumference. Each radial airway diameter (13) is connected to and corresponds one-to-one with the axial airway shafts (11) and the axial airway shafts (14). The end of the axial airway shaft (11) near the main shaft rotor (10) is provided with a throttle hole and a small hole throttle (9). A number of axial air passage shafts 2 (12), a number of radial air passages 2 (15), a number of radial air passages 3 (16), a number of radial air passages 4 (17), a number of radial air passages 5 (18), a number of radial air passages 6 (19), and a number of axial air passage shafts 4 (20) are all evenly distributed around the circumference on the bushing (6). The end of the axial air passage shaft 2 (12) near the surface of the main shaft rotor (10) is a throttle mounting hole with a small hole throttle (9). The axial air passage shaft 3 (14) and the radial air passages 2 (15) are connected to the shaft. The radial airway shaft 2 (12) is connected to the axial airway shaft 4 (20) in a one-to-one correspondence and sequentially. The radial airway diameter 2 (15) is connected to the axial airway shaft 4 (20) in a one-to-one correspondence and mutually connected. The axial airway shaft 4 (20) is connected to and in series with the radial airway diameter 3 (16), the radial airway diameter 4 (17), the radial airway diameter 5 (18), and the radial airway diameter 6 (19). The radial airway diameter 3 (16), the radial airway diameter 4 (17), the radial airway diameter 5 (18), and the radial airway diameter 6 (19) are respectively connected to the corresponding throttle mounting holes on the copper bushing (4).

4. The ultra-precision gas hydrostatic bearing with aerosol lubrication according to claim 3, characterized in that: The inner surface of the bushing (6) has four annular grooves, and the radial air passages of the third (16), the radial air passages of the fourth (17), the radial air passages of the fifth (18), and the radial air passages of the sixth (19) are connected by their respective annular grooves.

5. The aerosol lubricated ultra-precision gas hydrostatic bearing according to claim 3, characterized in that: A sealing plug (7) is provided on the side of the radial air passages three (16), four (17), five (18), and six (19) near the bearing base (5), and a sealing plug (7) is also provided at the end of the radial air passages two (15), and a sealing plug (7) is also provided at the end of the axial air passage shaft four (20).

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