Influence of cleanliness of full complement cylindrical roller bearings on bearings

The influence of the cleanliness of the full complement cylindrical roller bearing on the bearing: due to the relative movement of the rolling element and the raceway and the intrusion of pollutants and dust, the surfaces of the rolling element and the raceway are worn. When the amount of wear is large, the bearing, noise and vibration increase, which reduces the running accuracy of the bearing, thus directly affecting the accuracy of some hosts. Therefore, for some silent machinery bearings, daily maintenance is mainly to prevent the intrusion of pollutants and dust. 1. Influence on bearing life The cleanliness of the bearing has a considerable influence on the life of the needle roller bearing. The bearing has carried out special tests for this purpose, and the result is that the difference is several times or even dozens of times. The higher the cleanliness of the bearing, the longer the life, etc. Tests show that the lubricating oil of different cleanliness has a great influence on the life of the ball bearing. Therefore, improving the cleanliness of the lubricating oil can prolong the life of the bearing. In addition, if the dirt particles in the lubricating oil are controlled below 10um, the life of the bearing will also increase several times. 2. Influence on vibration and noise The test results of the bearing test center show that the cleanliness seriously affects the vibration level of the bearing, especially the vibration in the high frequency band. The bearing with high cleanliness has a low vibration velocity value, especially in the high frequency band. The influence of dust in the needle roller bearing grease on the noise has been tested, and it has been proved that the more dust, the greater the noise. 3. Effect on Lubrication Performance The decrease in bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of the grease and accelerates its aging, thereby affecting the decline of the lubricating performance of the grease. What is the relationship between the material and performance of cylindrical roller bearings? The rings and rolling elements of a rolling bearing are repeatedly subjected to high contact pressure, while rolling contact with sliding is carried out. The retainer is in sliding contact with both sides of the ferrule and the rolling element, or one of them, and is subjected to tensile force and contraction force on the other. Therefore, the material, performance and important requirements for bearing rings, rolling elements and cages are as follows. The performance required by the ferrule and rolling element materials: high rolling fatigue strength, high hardness, high wear resistance, and high wear resistance. Depending on the application, it is also required to have good impact resistance, heat resistance and corrosion resistance. Information on rings and rolling elements: High-carbon chromium bearing steels are usually used for rings and rolling elements. Most of the bearings use SUJ2 in the JIS steel grade. Large bearings use SUJ3. The chemical composition of SUJ2 has been standardized as a material for sliding bearings in countries around the world. For example: it is the same kind of steel as AISL52100 (USA), DIN100Cr6 (West Germany), BS535A99 (UK). In the case of further need for impact resistance, chromium steel, chromium-molybdenum steel, nickel-chromium-molybdenum steel are used as bearing materials, and carburizing quenching is adopted to make the steel have a softening layer from the surface to an appropriate depth. Carburized bearings with appropriate softening depth, fine structure, suitable hardness of the surface and core hardness have superior impact resistance than bearings using bearing steel, and the chemical composition of individual carburized bearing steels. The vacuum degassing solution is implemented, so the materials used have high purity, low oxygen content and good quality. Appropriate thermal solutions were then adopted to significantly improve the rolling fatigue life of the bearing.

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