Whether the NSK imported bearings need to be replaced
Since NSK imported bearings are not used for a long time, the frequency of damage is relatively high, so after a short period of time, it is necessary to replace them once, so as to avoid unnecessary losses, but under what circumstances, the bearings need to be replaced, how should we do it? To determine if the bearing is available? Mainly considering the degree of bearing damage, mechanical properties, importance, operating conditions, to the next maintenance period. If you have the following defects, you can no longer use them and you must replace them with new ones. There is a crack or a gap in any of the inner ring, the outer ring, the rolling element, and the cage.
1. There is a break on any one of the ferrule and the rolling element.
2. There are significant card injuries on the rolling surface, ribs and rolling elements.
3. The cage is worn significantly or the rivet is significantly slack.
4. There are rust and injuries on the raceway surface and rolling elements.
5. There are serious indentations and marks on the raceway surface and rolling elements.
6. There is obvious creep in the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.
7. The discoloration caused by heat is obvious.
8. The bearing sealed with grease, the seal ring or the dust cover is obviously damaged.
The specific judgment method of NSK imported bearings should be repaired, that is, the specific judgment methods for the bearing to be fully utilized and the adjacent damage appear as follows:
1) Using the bearing working condition monitoring instrument
It is the most convenient and reliable method to judge the working state of the bearing and determine when the bearing should be repaired by using a device such as a spectrometer or SPM or I-ID1 bearing working condition monitoring instrument.
For example, when using the HD1 type instrument, when the pointer approaches the danger zone from the warning zone, and the pointer does not return after taking measures such as improving lubrication, it can be found that the NSK bearing itself is in a problem. When the bearing is repaired. How far from the danger zone to start repairs can be adjusted by experience.
With such an instrument, it is safe and economical to make full use of the bearing working potential, to repair the bearing in time, and to avoid malfunctions.
2) Monitor with simple tools
In the case where the above instruments are not available, the operator can hold a tool such as a round bar or a wrench against the outer casing of the machine closest to the bearing, and shame the ear on the tool to monitor the sound of the bearing transmitted by the tool. Of course, it can be modified with a medical stethoscope. . The normal bearing operation sound should be uniform, smooth and not harsh, and the abnormal bearing operation sound has a variety of intermittent, impact or harsh sound. First of all, we should get used to the normal bearing operation sound, and then we can grasp the abnormal sound of NSK imported bearings, and then through the accumulation of practical experience, we can further analyze what kind of abnormal sound corresponds to what kind of bearing is not normal. phenomenon. There are many types of abnormal sounds in bearings, which are difficult to express, mainly based on experience.
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