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Inspection and maintenance of rolling sound of bearings

The size and quality of the rolling sound of the bearing in operation are checked by a microphone. Even if the bearing is slightly peeled off, it will emit abnormal and irregular sounds, which can be distinguished by a microphone.
It is a very common way to identify irregular movement by hearing. For example, the use of electronic stethoscope to detect abnormal noise in a part is often the method used by experienced operators. If the bearing is in good condition, it will make a low whining sound. If a sharp hissing, squeaking and other irregular sounds are made, it is often indicated that the bearing is in poor condition of connection.
The sharp squeak noise may be due to improper lubrication. Improper bearing clearance also causes metal noise. The dent in the concave track on the outer ring of the bearing can cause vibration and cause smooth and crisp sound. If the striking marks caused by the installation also produce noise, the noise will vary with the speed of the bearing.
If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is rolled over, if there are contaminants in the bearing often cause hissing. Serious damage to the same bearing will cause irregular and loud noise.
A. The cleaning of bearings is carried out by rough cleaning and cleaning, and the bearings can be placed on the metal grid at the bottom of the container in use.
When B or rough washing, remove grease or adhesive with brush in oil. At this point, if the bearing is rotated in the oil, the rolling surface will be noticed due to foreign bodies and other damage.
C, fine wash, slowly rotating bearings in oil, must be carefully carried out.
Normally used cleaning agent is neutral water-free diesel oil or kerosene, according to the needs of sometimes also use warm lye. No matter which detergent is used, it must be filtered regularly to keep it clean.
After cleaning, apply rust preventive oil or antirust grease immediately on the bearing.
2. Check and judge:
In order to judge whether the dismantled bearing can be reused, the bearing should be inspected for dimensional accuracy, rotational accuracy, internal clearance, mating surface, raceway surface, cage and sealing ring.
The inspection results can be judged by the use of inertial bearings or proficient bearings.
The criteria for bearing judgement vary according to mechanical performance and importance and inspection cycle. If the following damage occurs, the bearing shall not be reused and must be replaced.
A bearing parts breakage and defects.
Stripping of rolling surface of B raceway surface