When the imported bearing rotates, the free vibration of the cage and its impact with the rolling elements or rings will cause noise.

This noise can occur in various bearings, but the sound pressure level is low and low frequency. Its characteristics are:

1. Whether it is a stamped cage or a plastic cage, this noise may be generated.

2. No matter whether it is lubricated with thin oil or grease, this noise will appear.

3. This noise is most likely to appear when the outer ring is subjected to a bending moment.

4. When the radial clearance is large, this noise is easy to appear.

Since the cage pocket clearance and the clearance between the cage and the ring inevitably exist in the finished bearing, it is very difficult to completely eliminate the noise of the cage, but it can be improved by reducing assembly errors, optimizing reasonable clearance and cage movement.

Another special sound of the cage is the noise caused by the self-excited vibration of the cage caused by the friction between the cage and the guiding surface of other bearing parts. The stamping cage of imported bearings is thin, the bending stiffness in the radial and axial planes is low, and the overall stability is poor. When the bearing rotates at high speed, it will generate self-excited vibration due to bending deformation, causing "buzzing".

When the bearing is under the action of radial load and the performance of the grease is poor, the noise of "click, click" will be heard at the beginning of operation. This is mainly due to the sudden acceleration of the rolling element after leaving the load zone and the collision with the cage, resulting in noise. This kind of impact sound is inevitable, but as the running time increases, its sound will gradually disappear.

There are three ways to solve the noise of imported bearings due to improper lubricants:

Choose the right lubricant;

Add lubricant according to the specified amount of lubrication;

Regularly replace the lubricant to avoid aging and hardening of the lubricant.

If the bearings are making noise due to improper lubricant, don't worry too much, as this problem can be effectively solved. If the bearing surface is damaged and dust enters, there is no need to worry, because there are corresponding solutions.

to clean

First, the bearing needs to be removed for inspection and its appearance recorded. At the same time, determine the amount of lubricant remaining in the bearing and take a sample before cleaning the bearing.

Cleaning can be divided into two steps: rough cleaning and fine cleaning. Neutral, non-aqueous diesel or kerosene is usually used as a cleaning agent, and it is often filtered to keep it clean. After cleaning, anti-rust oil or anti-rust grease should be applied to the bearing surface immediately to avoid oxidative corrosion.

Inspection and Judgment

In order to determine whether the dismantled imported bearing can be used again, it is necessary to specially check its dimensional accuracy, rotation accuracy, internal clearance, as well as the mating surface, raceway surface, cage and sealing ring. The inspection results can be evaluated by persons who are familiar with bearings or have a good knowledge of bearings. Judgment criteria may vary depending on mechanical properties, criticality, inspection cycle, etc.

If the following damage occurs, the rolling bearing must be replaced and cannot be reused:

Imported bearing parts have fractures and defects.

The raceway and rolling surfaces are delaminated.

In short, when judging whether imported bearings can continue to be used, it is necessary to conduct a comprehensive inspection and evaluation, and judge according to relevant standards. If the above damage occurs, the bearing must be replaced immediately to ensure the safe operation of the machine equipment.

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