Inspection and judgment of rolling bearings?

Update:08-03-2021
Summary:

In order to judge whether the removed bearing can be re […]

In order to judge whether the removed bearing can be reused, it is necessary to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage, and sealing ring. Because large bearings cannot be rotated by hand, pay attention to checking the appearance of rolling elements, raceway surfaces, cages, rib surfaces, etc. The higher the importance of the bearing, the more careful inspection is required.
Causes of rolling bearing heating and its elimination methods
Low bearing accuracy: select bearings with specified accuracy grades.
The spindle is bent or the box hole is not concentric: repair the spindle or box.
Poor lubrication: use the lubricating material of the specified brand and clean it properly.
Low assembly quality: Improve assembly quality.
Bearing inner and outer shell running ring: replace the bearing and related wear parts.
Axial force is too large: cleaning and adjusting the sealing ring gap between 0.2mm and 0.3mm, correcting the diameter of the impeller balance hole and verifying the static balance value.
Bearing damage: replace the bearing.
custody
The bearings are coated with an appropriate amount of anti-rust oil and packed with anti-rust paper when they leave the factory. As long as the packaging is not damaged, the quality of the bearings will be guaranteed. However, for long-term storage, it is advisable to store it on a shelf 30cm above the ground under the condition that the humidity is lower than 65% and the temperature is about 20°C. In addition, the storage place should avoid direct sunlight or contact with cold walls.

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