Overheating is the biggest culprit of bearing failure, mainly because bearing heating is usually an alarm signal for abnormal machine operation. If not dealt with as soon as possible, it will cause chain reactions such as machine damage. So what are the common causes of bearing heating?
Low bearing accuracy, improper selection, substandard bearing accuracy or differences in selection will directly cause the bearings to heat up because the machine cannot meet the optimal operating conditions.
Solution: Choose bearings with accuracy levels specified by official requirements.
Large vibrations include poor coupling alignment process that does not meet requirements, dynamic and static unbalance of the rotor, poor foundation rigidity, weak foundations, rotational stall and surge. During operation, some rotors are corroded by media or worn by solid impurities, or the shaft is bent, which will cause unbalanced centrifugal force, causing the bearings to heat up and vibrate, and the raceways to be severely worn until they are destroyed.
Insufficient cooling. Insufficient cooling usually manifests as: pipeline blockage, improper selection of cooler, poor cooling effect, etc. The cooler of the lubrication pipeline is scaled and blocked, which will cause the cooling effect to deteriorate, especially during summer production. Severe scaling of the cooler and frequent alarms due to high bearing temperature are encountered in many production sites. A more effective solution is to pickle and descale the cooler every year before summer.
Improper installation. Improper installation is another important cause of bearing heating. Because the correct installation of the bearing has a direct impact on its life and the accuracy of the main engine, it is required that the center line of the shaft and the bearing hole must coincide during installation. If the bearing is installed incorrectly, the accuracy is low, and the bearing has deflection, torque will be generated during rotation, causing the bearing to heat up or wear. In addition, the bearings will also vibrate, increase noise, and increase temperature rise.
