There are uneven pits on the contact surface between the raceway and the roller of the ina bearing, indicating that the four-row cylindrical roller bearing has plastic deformation. The reason is that under the action of a large static load or impact load, the local stress of the working surface exceeds the yield limit of the material, which generally occurs on bearings rotating at low speeds. The reason for the cracks in the bearing race may be that the bearing is too tight, the bearing or inner ring is loose, the bearing part of the ina bearing is deformed, and the surface of the installed bearing is poorly processed, etc. The steel surface under the action of instantaneous high temperature reacts with oxygen in the air, and rises into an extremely thin (20-30nm) iron oxide thin layer. It is worth noting that there is a corresponding relationship between the thickness of the oxide layer and the total thickness of the surface grinding modified layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the grinding quality. It is common for ina bearings to fail during operation, so there is no need to make a fuss. When a fault occurs, judgment and handling are the key. The reasons for the high temperature of the four-row cylindrical roller bearing are: the quality of the lubricating oil does not meet the requirements or deterioration, the viscosity of the lubricating oil is too high; the mechanism assembly is too tight (insufficient clearance); the bearing assembly is too tight; a. Pad surface corrosion: spectral analysis It was found that the concentration of non-ferrous metal elements was abnormal; many sub-micron wear particles of non-ferrous metal components appeared in the ferrography; the moisture content and acid value of the lubricating oil exceeded the standard. b. Strain on the journal surface: There are iron-based cutting abrasive particles or black oxide particles in the ferrography, and there is a tempered color on the metal surface. c. Surface corrosion of the journal: Spectral analysis found that the concentration of iron was abnormal, there were many submicron particles of iron in the ferrography, and the moisture content of the lubricating oil exceeded the standard or the acid value exceeded the standard. d. Surface strain: There are cutting abrasive particles found in the ferrography, and the abrasive particles are composed of non-ferrous metals. e. Fretting wear of tile back: Spectral analysis found that the iron concentration was abnormal, there were many sub-micron wear particles of iron composition in the ferrography, and the moisture and acid value of the lubricating oil were abnormal. Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear, and the oil film also has a certain vibration absorption capacity. A large amount of energy generates a large amount of grinding heat, resulting in local instantaneous high temperature in the grinding area. Using the linear motion heat source heat transfer theory formula to deduce, calculate or apply the infrared method and thermocouple method to measure the instantaneous temperature under the experimental conditions, it can be found that the instantaneous temperature of the grinding zone can be as high as 1000-1500 ℃ within 0.1-0.001ms. Such an instantaneous high temperature is enough to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even burn cracking of the surface layer of a certain depth on the working surface.
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