ceramic bearing

ceramic bearings:
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Equipment for aviation, aerospace, navigation, oil
Ceramic bearings are made of zirconia, silicon nitride, silicon carbide and other ceramic materials. They have the characteristics of high temperature resistance, cold resistance, wear resistance, corrosion resistance, non-magnetic electrical insulation and so on. In the past ten years, they have been widely used in various fields of national economy and people's livelihood, including aviation, aerospace, navigation, petrochemical, medical equipment and high-speed machine tools. Its low coefficient of thermal expansion and high modulus of elasticity, can adapt to extreme working conditions, according to the use of high-speed, high-temperature, corrosion-resistant and other types. The bearing ring and rolling body adopt full ceramic structure, and the manufacturing accuracy can reach P4 to UP level, covering deep groove ball bearings, angular contact ball bearings and other technical types. The scientific research team has developed an optimized design method for ultra-precision all-ceramic ball bearings, developed P4 grade ultra-precision all-ceramic ball bearings, developed high-speed ultra-precision silicon nitride all-ceramic bearings and CNC machine tool spindle motors in the past five years, and mastered the mass production process of hot-pressed silicon nitride ceramic balls and the forming grinding and super-finishing technology of ferrule channel. Series technology can manufacture high stiffness, small deformation, high dynamic characteristics of ceramic ball bearings, used in high-end CNC machine tool spindle system support components, instead of similar imported products. The research results won the second prize of national technological invention, the second prize of national technological progress and the Geneva International Invention Patent Gold Award
Chinese name ceramic bearing use high temperature resistance, cold resistance characteristics in the harsh conditions full of corrosive media
Material Classification: Zirconia
Zirconia
All ceramic bearings have the characteristics of anti-magnetic electrical insulation, wear resistance and corrosion resistance, oil-free self-lubrication, high temperature resistance and high cold resistance, and can be used in extremely harsh environments and special working conditions. The ferrule and rolling body are made of zirconia (ZrO2) ceramic material, and the retainer uses polytetrafluoroethylene (PTFE) as the standard configuration. Generally, glass fiber reinforced nylon 66(RPA66-25), special engineering plastics (PEEK,PI), stainless steel (AISISUS316), brass (Cu), etc.
Silicon Nitride
Silicon Nitride
Silicon nitride full ceramic bearing rings and rolling elements are made of silicon nitride (Si3N4) ceramic materials. Si3N4 full ceramic bearings compared to ZrO2 materials can be applied to higher speed and load capacity, as well as for higher ambient temperatures. At the same time, it can provide precision ceramic bearings for high-speed, high-precision and high-rigidity spindles, with the highest manufacturing accuracy of P4 to UP. The high-speed ultra-precision silicon nitride full ceramic bearing developed by the scientific research team has been applied to the spindle motor of CNC machine tools, and the relevant achievements have won the first prize at the provincial and ministerial level.
Full ball
Full ball
The full-mounted ball-type full ceramic bearing has a ball gap on one side. Due to the non-cage structure design, more ceramic balls can be loaded into the bearing than the standard structure, thereby improving its load capacity. In addition, it can avoid the limitation of the cage material. The corrosion resistance and temperature resistance of the ceramic cage-type full ceramic bearing can be achieved. This series of bearings is not suitable for high speed, installation should pay attention to the notch surface installed at the end of the axial load.
Mixing
Mixing
Ceramic balls, especially silicon nitride balls, have the characteristics of low density, high hardness, low friction coefficient, wear resistance, self-lubrication and good rigidity. They are especially suitable for rolling bodies of high-speed, high-precision and long-life hybrid ceramic ball bearings (inner and outer rings are metal). Generally, the inner and outer rings are made of bearing steel (GCr15) or stainless steel (AISI440C), and the ceramic balls can be made of ZrO2,Si3N4, or SiC.
Advantages:
ceramic bearing
First, because ceramics are almost not afraid of corrosion, ceramic rolling bearings are suitable for operation under harsh conditions full of corrosive media.
Second, because the density of the ceramic rolling ball is lower than that of steel, the weight is much lighter, so the centrifugal effect of the outer ring can be reduced by 40% when rotating, and the service life is greatly extended.
Third, the influence of thermal expansion and contraction of ceramics is less than that of steel, so when the gap of the bearing is constant, the bearing can be allowed to work in an environment where the temperature difference changes violently.
Fourth, because the elastic modulus of ceramics is higher than that of steel, it is not easy to deform when stressed, so it is beneficial to increase the working speed and achieve higher accuracy.
Application areas: medical equipment, cryogenic engineering, optical instruments, high-speed machine tools, high-speed motors, printing machinery, food processing machinery. For example, the high-speed ultra-precision silicon nitride full ceramic bearings developed by Shenyang University of Technology have been successfully applied to 6MW high-speed permanent magnet motor systems and flywheel energy storage high-speed magnetic levitation motor systems.
In the fields of aerospace, navigation, nuclear industry, petroleum, chemical industry, textile industry, machinery, metallurgy, electric power, food, locomotives, subways, high-speed machine tools and scientific research, national defense and military technology, it is necessary to work under special working conditions such as high temperature, high speed, cryogenic, flammable, explosive, strong corrosion, vacuum, electrical insulation, non-magnetic, dry friction, etc. The indispensable substitution role of ceramic bearings is gradually being recognized.
Shenyang Micro-control Flywheel Company relies on the flywheel energy storage system developed by silicon nitride ceramic bearing technology, and realizes rapid iteration of technology through the pilot service base [1]. With the continuous progress of processing technology and the increasing level of technology, the cost of ceramic bearings has been declining. It has been applied in a small range of high, fine and sharp fields in the past, and has been gradually extended to various industrial fields of the national economy. The market price of products has gradually approached practicality, reaching a level acceptable to users. The wave of large-scale application of ceramic bearings has come!
Main uses: Ceramic bearings have the characteristics of high temperature resistance, cold resistance, wear resistance, corrosion resistance, anti-magnetic electrical insulation, oil-free self-lubrication, high speed and so on. It can be used in extremely harsh environments and special working conditions, and can be widely used in aviation, aerospace, navigation, petroleum, chemical, automotive, electronic equipment, metallurgy, electric power, textiles, pumps, medical equipment, scientific research and national defense and military fields. It is a high-tech product for the application of new materials.
Ceramic bearing rings and rolling body using all ceramic materials, zirconia (ZrO2), silicon nitride (Si3N4), silicon carbide (SiC) three. The retainer is made of polytetrafluoroethylene, nylon 66, polyether imide, zirconia, silicon nitride, stainless steel or special aviation aluminum, thus expanding the application of ceramic bearings.
Use classification ""(1), high-speed bearings: with cold resistance, small force elasticity, pressure resistance, poor thermal conductivity, light weight, low friction coefficient, etc., can be used in 12000 r/min -75000 r/min high-speed spindle and other high-precision equipment;
(2), high temperature bearing: the material itself has a high temperature resistance of 1200 ℃, and self-lubricating, the use of temperature between 100 ℃-800 ℃ does not produce due to temperature difference caused by expansion. Can be used in furnaces, plastic, steel and other high-temperature equipment;
(3), corrosion-resistant bearings: the material itself has the characteristics of corrosion resistance, can be used in strong acid, alkali, inorganic, organic salt, seawater and other fields, such as: electroplating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment, etc.
(4), anti-magnetic bearing: because there is no magnetic, it does not absorb dust, can reduce the bearing surface spalling, thereby reducing the operating noise. Can be used in demagnetization equipment. precision instruments and other fields.
(5), electrical insulation bearings: due to high resistivity, free arc damage bearings, can be used in a variety of insulation requirements of power equipment.
(6), vacuum bearings: due to the unique oil-free self-lubricating characteristics of ceramic materials, in the ultra-high vacuum environment, can overcome the problem that ordinary bearings can not achieve lubrication. Note: For the above five types of bearings, the same set of bearings can be applied to high temperature, high speed, acid and alkali, magnetic field and non-insulation. However, due to different material properties (please refer to the performance table of rare earth ceramic materials), customers are invited to select the most suitable ceramic bearing according to their application.
Grade classification
deep groove ball bearing
(Technical grade: P4, P5, P6, P0) deep groove ball bearings, the most representative of rolling bearings, a wide range of uses, can withstand radial load and two-way axial load. Suitable for high-speed rotation and low noise, low vibration requirements or steel bearings can not be applied to the high temperature, cold, corrosion, magnetic field, non-insulation and other fields.
self-aligning ball bearing
self-aligning ball bearing
The outer ring raceway of the self-aligning ball bearing is spherical and self-aligning, which can supplement the error caused by different concentricity and shaft deflection. It is used to produce non-concentric shaft and shell or shaft deflection parts and high temperature, low cold, corrosion, magnetic field non-insulation and other requirements of the self-aligning parts. Note: The inclination cannot exceed 3 degrees.
Single row angular contact ball bearings
(Technical grades: P4, P5, P6, P0) Angular contact bearings are suitable for high-speed and high-precision rotation. They do not affect their accuracy at high temperatures, magnetic fields, and water, and can withstand synthetic loads. The standard contact angle is 15 °, 30 ° and 40 °. The greater the contact angle, the greater the axial load capacity, and the smaller the contact angle, the bearing can bear radial load and unidirectional axial load. Generally take the installation in pairs. Please pay attention when purchasing.
one-way thrust ball bearing
One-way thrust ball bearings are composed of a washer-shaped ferrule with a ball rolling raceway and a cage assembled with a ball. It can bear axial load, but not radial load.