The shaft parts of the machine tool, not the main shaft, are assembled with the thrust ball bearing and rotate at a high speed, sometimes generating high heat. If this phenomenon is not eliminated in time, it will cause the angular contact ball bearing to overheat, and the temperature of the corresponding part of the machine tool will increase and cause thermal deformation. In severe cases, the spindle and the tailstock will not be equal, which not only affects the accuracy and machining accuracy of the machine tool itself. And will burn the bearing.
Rated fatigue life refers to the operation of the same type of bearing under the same conditions, in which 90% of the angular contact ball bearings do not have the total number of revolutions caused by rolling fatigue. When the speed is constant, the total running time is used to indicate the rated fatigue life.
When studying the life of a thrust ball bearing, it is not only possible to consider the fatigue life, but also to consider the performance of the bearing and combine several use limits. For example, the grease life of grease lubricated bearings. Since the noise life, the wear life, and the like vary depending on the application, the use limit is different, and therefore, the experience limit is often selected in advance.
Therefore, it is difficult to know the true cause of the damage by investigating only the angular contact ball bearing damage. However, if you know the use of the thrust ball bearing machinery, the conditions of use, the structure around the bearing, and understand the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.
The judgment of whether the angular contact ball bearing is available is mainly determined by considering the degree of bearing damage, mechanical properties, importance, operating conditions, and the period of the next maintenance. If you have the following defects, you can no longer use them. You must replace the new thrust ball bearings. There are cracks or gaps in any of the inner ring, the outer ring, the rolling elements, and the cage.
When taking the oil-free bearing directly by hand, wash off the sweat on your hands and apply high-quality mineral oil before handling. Pay special attention to rust prevention during the rainy season and summer. Under certain special operating conditions, angular contact ball bearings can achieve longer life than traditional calculations, especially at light loads. These special operating conditions are when the rolling surfaces (tracks and rolling elements) are separated by the lubricating oil film and the surface damage caused by contaminants is restricted. In fact, under ideal conditions, the so-called bearing life is likely to not allow strong stamping, does not allow the hammer to directly hit the bearing, and does not allow the pressure to be transmitted through the rolling elements.
The angular contact ball bearing rotates, the raceway surface of the inner ring and the outer ring, because it is in rolling contact with the rolling element, the running track is a dark surface, and the running track attached to the raceway surface is not an abnormality, thereby knowing the load Conditions, so when disassembling the oil-free bearing, please pay close attention to and observe the running track of the raceway surface.
