Bearings are generally manufactured through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished INA bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of the working surface of the universal joint bearing shows that the grinding process is closely related to the surface quality of the bearing.
The main task of INA bearing life analysis is to find out the main factors causing bearing failure based on a large amount of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, prolong the service life of bearings and avoid bearing protrusion. Early failure of the hair.
1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil is rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).
2. Apply lubricant to the bearing seat and bearing mating surface, and insert the INA bearing into the bearing housing. Then the assembled bearing is placed on the shaft together with the bearing housing. Push to the desired location for installation.
3. The bolts of the fixed bearing housing should not be tightened first, so that the bearing housing can rotate in the bearing housing. Also mount the other end bearing and seat on the same shaft and turn the shaft a few turns to allow the INA bearing itself to automatically position itself. Then fasten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the shaft is tightened by hand in the direction of rotation. Then insert or hold the small iron rod against the counterbore on the eccentric sleeve. 1. Use a hammer to strike a small iron rod in the direction of rotation of the shaft. Install the eccentric sleeve securely and finally lock the socket head cap screws on the eccentric sleeve.
After continuing to run, the vibration and noise of the universal joint bearing began to increase, and sometimes the abnormal sound appeared, but the change of the vibration increased slowly. At this time, the INA bearing kurtosis value suddenly reached a certain value. We believe that the bearing is an initial failure at this time.
At this time, it is required to closely monitor the imported bearings and pay close attention to the changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both exceed the vibration standard, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the universal joint bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the bearing.
The bearing exhibits late fault characteristics to serious faults (generally INA bearing damage such as holding shaft, burn, sand frame spalling, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of self-aligning ball bearings, once the late fault characteristics are found, the joint of the universal joint bearing should be judged decisively and the maintenance should be arranged as soon as possible.
The main task of INA bearing life analysis is to find out the main factors causing bearing failure based on a large amount of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, prolong the service life of bearings and avoid bearing protrusion. Early failure of the hair.
1. Before installing the bearing on the shaft, the bearing pin of the bearing sleeve must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil is rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft).
2. Apply lubricant to the bearing seat and bearing mating surface, and insert the INA bearing into the bearing housing. Then the assembled bearing is placed on the shaft together with the bearing housing. Push to the desired location for installation.
3. The bolts of the fixed bearing housing should not be tightened first, so that the bearing housing can rotate in the bearing housing. Also mount the other end bearing and seat on the same shaft and turn the shaft a few turns to allow the INA bearing itself to automatically position itself. Then fasten the bearing block bolts.
4. Install the eccentric sleeve. First, eccentric sleeve is placed on the eccentric step of the inner sleeve of the bearing, and the shaft is tightened by hand in the direction of rotation. Then insert or hold the small iron rod against the counterbore on the eccentric sleeve. 1. Use a hammer to strike a small iron rod in the direction of rotation of the shaft. Install the eccentric sleeve securely and finally lock the socket head cap screws on the eccentric sleeve.
After continuing to run, the vibration and noise of the universal joint bearing began to increase, and sometimes the abnormal sound appeared, but the change of the vibration increased slowly. At this time, the INA bearing kurtosis value suddenly reached a certain value. We believe that the bearing is an initial failure at this time.
At this time, it is required to closely monitor the imported bearings and pay close attention to the changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both exceed the vibration standard, and the kurtosis value also exceeds the normal value (the available kurtosis is relative to the standard), we believe that the universal joint bearing has entered the late fault production, and it is necessary to repair the equipment in time and replace the bearing.
The bearing exhibits late fault characteristics to serious faults (generally INA bearing damage such as holding shaft, burn, sand frame spalling, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of self-aligning ball bearings, once the late fault characteristics are found, the joint of the universal joint bearing should be judged decisively and the maintenance should be arranged as soon as possible.
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