After the bearing is installed in the main engine, if the radial runout of the main shaft is measured, it can be found that the measured value of each revolution has a certain change; when continuous measurement is performed, it can be found that after a certain number of revolutions, this change will approximately repeat. Appear. The index to measure the degree of this change is the cyclic rotation accuracy. The number of revolutions required for the change to appear approximately repeats represents the 'quasi-period' of the cyclic rotation accuracy. The magnitude of the change in the quasi-period is large, which is the poor cyclic rotation accuracy. . If appropriate preload is applied to the main shaft, the rotational speed is gradually reduced to close to the required rotational speed to implement the 'run-in' effect of the bearing, which can improve the cyclic rotation accuracy of the main shaft. The main factors for adjustment are installation, use and maintenance, maintenance and repair, etc. to meet technical requirements. According to the technical requirements of SKF bearing installation, use, maintenance, and maintenance, the operating bearing contact load, speed, temperature, vibration, noise and lubrication state are monitored and inspected. If any abnormality is found, immediately find the cause and make adjustments to make it return to normal. The installation condition is one of the factors that use the bearing, which is the primary factor that often causes incorrect state changes between the various parts of the installation package. The bearing capacity, in the abnormal operating state and the early termination of life, the internal factors mainly refer to the structural design, quality The manufacturing process and materials, there are three factors that determine the quality of the bearing. The influence of the metallurgical quality of the bearing material is the main factor in the early failure of rolling bearings. With the advancement of metallurgical technology (such as bearing steel, vacuum degassing, etc.), the quality of raw materials has been improved. The proportion of raw material quality factor in bearing failure analysis has dropped significantly, but it is still one of the main factors of bearing failure. Whether the selection is appropriate is still a bearing failure analysis that must be considered. Bearing manufacturing goes through multiple operations of forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of the treatment will also affect the service life of the bearing. The heat treatment and grinding processes that affect the bearing are often more directly related to the product quality of the bearing failure. In recent years, studies on the deterioration of the bearing surface layer have shown that the grinding process is closely related to the bearing surface quality. The main task of SKF bearing service life analysis is to find out the main factors causing bearing failure based on a large number of background materials, data and failure mode analysis, therefore, to propose improvement measures to extend the bearing service period to avoid the occurrence of sudden bearing failure and early failure . Power operation, start from no-load low speed, and gradually increase to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, changes in bearing temperature, leakage of lubricant or discoloration, etc. If an abnormality is found, the operation should be stopped immediately, the machinery should be checked, and if necessary, the bearing should be removed for inspection. The bearing temperature can generally be estimated from the external temperature of the bearing housing. However, it is more accurate to directly measure the temperature of the bearing outer ring using the oil hole. The bearing temperature gradually increases from the start of operation, and usually stabilizes after 1 to 2 hours. If the bearing is not properly installed, the temperature will rise sharply, resulting in abnormally high temperature. The reasons are such as too much lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, etc. In the case of high-speed rotation, the wrong choice of bearing structure and lubrication method is also the cause. The rotating sound of SKF bearing is checked with a stethoscope, etc. There are strong metal noises, abnormal sounds, irregular sounds, etc., indicating abnormality. The reasons are poor lubrication, poor shaft or bearing seat accuracy, bearing damage, foreign matter intrusion, etc. Common faults of bearings are as follows: 1. Corrosion of the tile surface: Spectral analysis finds that the concentration of non-ferrous metal elements is abnormal; many sub-micron wear particles of non-ferrous metal components appear in the ferrography; the moisture content of the lubricating oil exceeds the standard and the acid value exceeds the standard. 2. 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. 3. Surface corrosion of the journal: Spectral analysis found that the iron element concentration was abnormal, there were many sub-micron particles of iron composition in the ferrography, and the moisture content of the lubricating oil exceeded the standard or the acid value exceeded the standard. Under the condition of liquid lubrication, the sliding surfaces are separated by the lubricating oil without direct contact, which can greatly reduce friction loss and surface wear, and the oil film also has a certain ability to absorb vibration
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