Ntn thrust ball bearing heating increased load impact on life

The shaft parts of the machine tool, especially the main shaft, are generally 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 ntn bearing to overheat and cause the temperature of the corresponding part of the machine tool to rise and cause thermal deformation. In severe cases, the spindle and the tailstock will not be equal, which not only affects the precision and machining accuracy of the machine itself, but also Will burn the bearing.

Rated fatigue life refers to the operation of a group of bearings of the same type under the same conditions, in which 90% of ntn 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 ntn 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 ntn bearing is available is mainly determined by considering the degree of bearing damage, mechanical properties, importance, operating conditions, and the period until the next inspection. If you have the following defects, you can no longer use them. You must replace the new thrust ball bearings. There is a crack or a gap in any of the inner ring, the outer ring, the rolling element, and the cage.