二四六天天彩免费资料查询_美女视频黄频在线看_免费很黄很色裸露在线视频_和尚庙里的女人_国产亚洲观看无码

Shaft parts of machine tools, especially spindles, are generally assembled with thrust ball bearings and rotate at very high speeds, sometimes generating high heat. If this phenomenon is not ruled out in time, will lead to angular contact ball bearings overheating, and the corresponding parts of the machine temperature and heat distortion, the spindle and tailstock will not make the case of high, which not only affects the machine itself and precision machining accuracy , But also burn the bearings.
Rated fatigue life, refers to a group of the same type of bearing, under the same conditions, of which 90% of the angular contact ball bearings do not appear rolling fatigue caused by the total number of spalling. At a constant speed, multi-purpose total running time to indicate the rated fatigue life.
Thrust ball bearings in the study of life, we can not only consider the fatigue life, but also based on the performance of the bearings should be combined with several use limits to consider. For example, Grease lubrication grease life. Noise life, wear life, etc., according to different purposes, the use of different benchmarks, therefore, mostly pre-selected experience limits.
Therefore, only investigating the angular contact ball bearing damage, it is difficult to know the real cause of injury. However, if you know the use of thrust ball bearings machinery, conditions of use, the structure around the bearings to understand the situation before and after the accident, combined with the bearing damage and inspection of several reasons, we can prevent the recurrence of similar incidents.
Angular contact ball bearings are available judgments, mainly considering the degree of bearing damage, mechanical properties, importance, operating conditions, to the next maintenance period and decide. If you have the following defects can no longer be used, you must replace the new thrust ball bearings. Inner ring, outer ring, rolling body, cage any crack or gap.
Wear failure is one of the common failure modes of all types of bearings, which can be divided into the most common abrasive wear and adhesive wear according to the wear form.