Effect of grease quality on the use of fag with flanged linear bearings

Fag Bearings has the world's most mature and comprehensive range of high-precision bearings for machine tool spindles, representing the highest level of performance. Bearings can provide bearings for the design of almost all spindles on the market. Therefore, the choice of flanged linear bearings can meet the requirements of most specific applications. The contact shape of this type of fag bearing, the choice of materials, the best surface quality, and other characteristics of lubricant feeding have the following advantages:
High precision
2. Excellent high speed performance
3. High stiffness
4. Good seismic performance.
Grease plays an important role in the entire fag bearing system. Whether grease lubrication or oil lubrication has a large impact on system cost. Lubricants must undergo a rigorous validation process prior to use. Calculations and suitability tests for specific application requirements, such as the temperature performance and run-in performance of high-speed rotating spindles, are important throughout the process. The result of this complex process is that the technical parameters of the lubricant to be verified are verified and its exact suitability is ensured by continuous testing.
The metallurgical quality of flanged linear bearing materials used to be a major factor affecting the early failure of fag bearings. With the advancement of metallurgical technologies (such as vacuum degassing of bearing steels), the quality of raw materials has improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting bearing failure. The proper selection of materials is still a factor that must be considered in bearing failure analysis.
The fag bearing is a structure with or without a cage. Among them, large-sized bearings are generally required to bear a large load, often without a cage, but filled with rolling elements between the inner and outer raceways. Most small and medium-sized flanged linear bearings are equipped with cages.
In the fag bearing process, how the outer ring, inner ring, rolling element and cage of the bearing are assembled. Simply put, the inner and outer rings of the bearing are placed first, the inner ring is placed sideways, then the rolling elements are placed (on one side), then the position of the rolling elements is adjusted, and finally, the cage is placed. Now everyone knows that there is also a cage involved in the processing of flanged linear bearings. What is the main function of the bearing cage?

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

Reduce the effects of vibration and temperature on NTN needle roller bearings through proper use of grease

Many factors in real life affect bearings, such as temperature, vibration, etc. These are the factors that affect needle roller bearings. How can we prevent these factors from affecting NTN bearings? And the effect of temperature on the bearing:
First, bearing vibration
NTN bearing vibration damage sensitivity, such as peeling, indentation, rust, crack, wear, etc. will be reflected in the bearing vibration measurement, therefore, the vibration is measured by a special needle bearing vibration meter (frequency analyzer, etc.), frequency point It cannot be inferred to pass an unusual situation. Measured values ​​are different depending on the conditions in which the sensor bearings are used or where the mounting position is different. Therefore, it is necessary to compare the analysis and measurement values ​​determined for each machine in advance.
Second, the bearing temperature
NTN bearing temperature, the temperature outside the general bearing can be inferred, if it can be directly measured using the bearing outer ring temperature, it is more appropriate.
Normally, the temperature of the needle bearing begins to rise slowly for 1-2 hours to reach a steady state. For the heat capacity of the machine, the bearing at room temperature, cooling capacity, speed and load changes. If the lubrication is installed and the corresponding part is installed, the NTN bearing is suddenly heated up and there will be an abnormally high temperature. When the operation is stopped, take necessary precautions.
The temperature sensor can monitor the operating temperature of the NTN bearing at any time and achieve a temperature exceeding the specified value to prevent automatic alarm or stop the burning shaft accident.
The first is the viscosity of the bearing grease
NTN bearing greases are usually expressed in terms of apparent viscosity or similar viscosity. When describing the viscosity of the grease, the temperature and shear rate must be specified. Similar viscosity indicators can be used to control its low temperature fluidity and pumpability.
The second is the low temperature fluidity of bearing grease
One of the important indicators to measure the low temperature performance of NTN bearing grease is low temperature torque, that is, the degree of rotation of the low speed flow needle bearing at low temperature (below -20 ° c), the low temperature torque of the grease is changed from start to turn. The average value of the torque after the moment and the rotation of 60 mm is expressed.
The third is the evaporation of bearing grease
The evaporability (degree) of the NTN bearing grease indicates the degree of volatilization of the grease when the grease is used for a long period of time under high temperature conditions, and the smaller the evaporability, the better. The evaporability of the fat depends primarily on the nature of the lubricating oil and the fraction composition.
The fourth is the oxidation stability of bearing grease
Oxidation stability refers to the ability of grease to resist heat and oxygen when used for long-term storage or long-term high temperature, maintaining its ability to not permanently change. Due to oxidation, the free base content is reduced or the free organic acid content is increased, the dropping point is lowered, the appearance color is deepened, the odor is exhibited, the consistency, the strength limit, the similar viscosity is decreased, the corrosive product is formed, and the structure of the grease is broken. Substance, causing the separation of soap oil. Therefore, in the long-term storage of grease, it should be stored in a dry and ventilated environment to prevent exposure to sunlight, and regular changes should be made to the changes of free alkali or free organic acid, corrosive and other items to ensure its quality and performance.
The fifth is the thixotropic of bearing grease
The most basic characteristic of NTN bearing grease is thixotropy. When an external force is applied, the flow of the grease is gradually softened, indicating a decrease in viscosity, but once at rest, after a period of time (very short), the consistency is again increased (recovered), a property called thixotropy. This property of the grease determines that it can be lubricated in parts that are not suitable for lubricating oil, showing its excellent performance.

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