Smooth method for FAG high speed bearings

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Smooth method for FAG high speed bearings

Source: China Bearing Network Time: 2014-05-22

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The smooth and difficult point of high-speed FAG bearings is that the smoothing agent is simply scattered; it is not easy to adhere to the tumbling appearance; or it is blocked by the high-speed airflow around the FAG bearing and cannot enter the FAG bearing; the smoothing agent entering the FAG bearing is too high; sometimes FAG bearings are damaged; for example, the racks appear to pock; the desquamation increases the conflict wear.
The operating temperature of high-speed FAG bearings is mostly around 200 °C; and tends to be higher; if not cooled, the temperature will continue to rise and the strength and hardness of FAG bearings will be too high; once FAG bearings lose their ability to adhere to accurate shapes Will increase the high-speed conflict and increase the temperature agile; further incur the decline in data strength and hardness, so that FAG bearings will quickly fail.
Because high-speed FAG bearings are very sensitive to wear; but simple wear debris; if not timely removed from FAG bearings; will also constitute a vicious circle; FAG bearing agile failure.
Therefore, the mission of high-speed FAG bearing smoothing is necessary to effectively deliver the smoothing agent to the moving exterior of the FAG bearing; and remove the heat from the FAG bearing; together with the abrasive debris in the FAG bearing.
The smooth methods commonly used in high-speed FAG bearings and useful smoothing agents are:
1. Spray illuminating method is to spray smooth oil from the nozzle hole of the FAG bearing; to spray the FAG bearing at a speed of 10 20 m/s; generally, it is sprayed into the gap formed by the bracket and the inner ring or the outer ring; The method of smoothing and cooling FAG bearings.
For small ball FAG bearings with an inner diameter of 30-35mm; the limit of dmn can reach 3 million for jet gliding and sliding, and 2.5 million for larger FAG bearings.
Double-hole or multi-hole nozzles can increase the oil supply; it can also improve the power of smooth oil; multi-nozzles or nozzles on both ends; can improve the smoothness and cooling effect; but when the dmn value is nearly 2 million Because of the influence of centrifugal inertia and wind resistance; the oil fed into the FAG bearing is only 70% or less of the nozzle flow.
2. The smoothing method under the ring is to use centrifugal inertia; the oil is directly sprayed to the outer surface of the raceway through a plurality of radial holes formed in the inner ring, and a part of the oil moves axially under the inner ring to reach the cooling. The intention of the circle. The oil entering the raceway will flow out to the left and right of the two channels; the sputum will be washed away from the abrasive debris falling from the parts such as the support frame.
The smoothing method uses much less oil than the injection; the power loss caused by the power mixing of the oil is also less; the heating condition of the FAG bearing is also greatly improved; and even the inner ring temperature can be lower than the outer ring. Drop FAG bearing failure rate.
This smooth method can be used to cool the outer ring. When inside; the outer ring is so smooth; FAG bearing's promised dmn value can be further improved.
Nowadays, this ring-smoothing method is widely used in various ultra-high-speed working places. The maximum dmn value that can be reached; the large-ball FAG bearing with inner diameter of 120-200mm is 3 million, and the tapered roller FAG bearing with inner diameter of 120mm is 240. Million; and the short cylindrical roller FAG bearing for the inner ring is 3 million
3. The two-layer smoothing method essentially consists of forming the hydrostatic oil film sliding FAG bearing of the inner ring hole and the journal of the tumbling FAG bearing; the rotation speed of the tumbling FAG bearing is greatly reduced; then the intention of reducing the centrifugal force effect is reached; such two The layer smooth FAG bearing can significantly reduce the rotational speed of the inner ring of the tumbling FAG bearing; therefore, the spindle is allowed to have a higher rotational speed; the dmn value equivalent to the FAG bearing can be further improved.
4. The biggest advantage of the oil and gas smoothing method is that the FAG bearing layout is not changed; the dmn value can be 800,000 to 1.5 million high speed only after the FAG bearing conflict; the FAG bearing with more internal sliding; The strengths of this approach are more obvious.
Principle of oil and gas smoothing and its characteristics The principle of oil and gas smoothing is to use a quantitative piston type distributor to discharge a very small amount of oil (for example, 0.01m1) intermittently at an optimum cycle; the discharged oil forms a continuous connection before reaching the FAG bearing. The liquid flow is fed into the FAG bearing with air.
The characteristics of oil and gas smoothness are as follows:
1. It can supply a very small amount of quantitative oil to the FAG bearing in a stable manner; therefore, it can control the minimum amount of oil required like smooth grease. Because the FAG bearing type is different; and the demand for smooth oil is different; It is passed to each set of FAG bearings; this can adjust the fuel supply of each FAG bearing.
The kinetic collision of this smooth method is about one-tenth of the gliding and sliding; its motion conflict is lost and the temperature rise is also smaller than the grease.
2. Because the oil and gas is smoother than the spray light, and the smooth oil flows into the FAG bearing with suitable oil droplets; therefore, the atmosphere is less polluted. For example, the smooth spindle of the oil and gas is placed in the propylene box for about 2 hours; the inside of the measuring box The air pollution level is only 0.03mg/m3.
3. It is difficult for foreign dust cutting fluid to enter the spindle; this is because of the large amount of air accompanying the supply of trace oil (20 L/min per FAG bearing); the reason for the progress of the internal pressure of the spindle.
Oil and gas smooth oil volume and viscosity oil and gas smooth should be supplied with FAG bearings with the minimum necessary amount of oil; so the selection of oil quantity is crucial.
The FAG bearing with more sliding angular touch ball has more oil than the cylindrical roller FAG bearing with less sliding. The general specification of the oil supply quantity has a formula.
However, the lower the viscosity of the oil; or the higher the rotational speed; the amount of oil required increases accordingly. In fact, the amount of oil should be determined according to the operating conditions such as FAG bearing load and rotational speed.
In terms of the effect of smooth oil viscosity on the temperature rise of FAG bearings; oil and gas smoothness is much smaller than cyclic oil supply. However, under the same oil supply conditions; when the viscosity is high; the temperature rise is slightly improved. The general oil and gas is smooth. At 40 ° C; use oil with a viscosity of 10 3Cmrn2 / s.
Gas smoothness is a new and successful method with a variety of characteristics; it is used in FAG bearings with more sliding, such as angular touch 婶FAG bearings; its dmn value can reach about 1.5 million.
5. Smoothing agent for high-speed FAG bearings The smoothing agent for high-speed FAG bearings should be considered as a smoothing agent for high-temperature FAG bearings; that is, a component oil that also has excellent functions at high temperatures; or a smooth grease based on such a constituent oil. Ester-based MIL L 7808 oil and MIL L 23699 oil; used more in jet engine FAG bearings.

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