Oil film FAG bearing oil characteristics

Among the accessories for FAG bearings, the FAG bearing oil is indispensable. It has a great effect on the protection and maintenance of FAG bearings! Good lubrication can make the use of FAG bearings smoother and greatly reduce wear. The lubrication characteristics of the rolling mill oil film FAG bearing determine that the oil film FAG bearing oil must meet its performance requirements to ensure the normal operation and continuous production of the rolling mill. Therefore, the oil film FAG bearing oil needs to have:

A good anti-wear and extreme pressure performance, when the oil is mixed with a small amount of water during operation, it can still form an oil film to maintain heavy load and anti-wear performance.

B. Good anti-wear, anti-rust and anti-foam properties, prevent corrosion of the lubrication system, block the oil circuit, cause wear and insufficient oil supply.

C superior demulsibility (ie water separation), can quickly separate the water in the oil in long-term use.

D good oxidation stability, cleanability and filterability. Smooth lubrication system and ensure normal lubrication

E Excellent viscosity-temperature performance (high viscosity index), when the FAG bearing temperature changes greatly, it can still achieve normal lubrication of each lubrication part....

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Control of the amount of grease used in TN bearings

NTN bearing lubrication is indispensable, so everything is done. How to master the amount of NTN bearing lubrication is very useful for NTN bearing maintenance. We know that grease has good adhesion, wear resistance, temperature resistance, rust resistance and lubricity. It can improve high temperature oxidation resistance, delay aging, dissolve carbon deposits, and prevent metal debris and oil stains from agglomerating. Improve the wear resistance, pressure resistance and corrosion resistance of the machine.

After understanding the movement of the grease in the NTN bearing, it is natural to conclude that the grease in the NTN bearing should not be excessive. More grease is not only wasted, but also harmful. The higher the speed of the NTN bearing, the greater the hazard.
The more grease is filled, the greater the friction torque. With the same amount of filling, the friction torque of the sealed NTN bearing is greater than that of the open NTN bearing. After the grease filling amount is equivalent to 60% of the internal space volume of the NTN bearing, the friction torque is no longer significantly increased. This is because most of the grease in the open NTN bearing has been extruded, and the grease in the sealed NTN bearing has also been lost.

As the grease filling amount increases, the temperature rise of the NTN bearing increases linearly. The same filling amount, the temperature rise of the sealed NTN bearing is higher than that of the open NTN bearing.

It is generally believed that the grease filling amount of the sealed rolling NTN bearing should not exceed 50% of the internal space. Tests by Shawki and Mokhtar have shown that ball NTN bearings are most suitable from 20% to 30%.

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