Four reasons for the vibration damage of NSK bearings

Generation of vibration in NSK bearings
    In general, rolling NSK bearings themselves do not produce noise. The "NSK bearing noise" that is usually felt is actually the sound effect of the NSK bearing directly or indirectly vibrating with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the entire NSK bearing application.
Excitation due to changes in the number of loaded rolling elements
    When a radial load is applied to an NSK bearing, the number of rolling elements carrying the load changes slightly during operation, which causes a shift in the load direction. The resulting vibration is unavoidable, but can be mitigated by axial preloading and applied to all rolling elements (not suitable for cylindrical roller NSK bearings).
Partial damage
    Small parts of NSK bearing raceways and rolling elements may be damaged due to handling or installation errors. In operation, rolling through damaged NSK bearing components produces a specific vibration frequency. Vibration frequency analysis identifies damaged NSK bearing components. This principle has been applied to condition monitoring equipment to detect NSK bearing damage. To calculate the NSK bearing frequency, please refer to the calculation program "NSK Bearing Frequency".
Accuracy of related parts
    In the case of a tight fit between the NSK bearing ring and the NSK bearing housing or the drive shaft, the NSK bearing ring may be deformed in accordance with the shape of the adjacent component. If deformation occurs, vibration may occur during operation.
Contaminant
    If operating in a polluted environment, impurities may enter the NSK bearing and be crushed by the rolling elements. The degree of vibration generated depends on the amount, size and composition of the particles being crushed, although it does not produce a typical frequency form, but an irritating noise can be heard.

For more information and purchase please visit: https://www.supplyforever.com

Rolling mill SKF imported bearing lubrication method

First, the lubrication method
The lubrication of the imported bearings of the rolls is basically the same as that of the other rolling imported bearings. However, the working conditions of the imported bearings of the rolls are relatively harsh, and whether the working performance can be effectively exerted depends largely on the lubrication of the imported bearings.
The lubrication methods used for the roller bearings are mainly grease lubrication and oil lubrication.
Grease-lubricated grease has a sealing function, the sealing structure and lubrication facilities are simple, and the grease is convenient to be replenished. Therefore, as long as the working conditions permit, the roller inlet bearings are generally grease-lubricated.
Oil lubrication has a strong cooling effect and can remove dirt and moisture from the imported bearings. Roller inlet bearings use oil-lubricated lubrication methods such as pressure oil lubrication, fuel injection lubrication, oil mist lubrication and oil and gas lubrication.
Pressure oil lubrication is the most effective lubrication method for roller bearings at normal speed.
The injection lubrication is to lubricate the lubricating oil to the inside of the inlet bearing through a nozzle mounted on one side of the inlet bearing for a certain pressure. Generally, it is applied to the high-speed roller inlet bearing, or the pressure supply lubrication cannot meet the cooling requirement. .
Spray lubrication is to spray dry compressed air containing oil mist into the inside of the imported bearing for lubrication. The use of less oil, due to the action of air, the cooling effect is very strong, mainly used for large roll imports with high rolling speed and high rolling precision. Bearings, or roll inlet bearings that are not often removed in the imported bearing housing.
Pressure oil lubrication and fuel injection lubrication require the installation of inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes oil coolers. Therefore, the cost is high, and the general roller inlet bearings are less used.

For more information and purchase please visit: https://www.supplyforever.com