When bearings are working, more or less they will cause a certain degree of damage and wear because of friction, especially when operating at high temperature, and even the bearing cage will be damaged.According to the degree of damage, it is generally divided into different stages, so the bearing cage used must have good thermal conductivity and small friction coefficient, so as to reduce the damage rate of bearings.

That is, the budding stage of bearing failure begins, when the temperature is normal, the noise is normal, the total vibration speed and the frequency spectrum are normal, but the total peak energy and the frequency spectrum have signs, reflecting the initial stage of bearing failure.At this time, the real bearing fault frequency appears in the ultrasonic section within the range of about 20-60kHz.

The temperature is normal, the noise is slightly increased, and the total vibration velocity is slightly increased. The change of vibration spectrum is not obvious, but the peak energy is greatly increased, and the spectrum is also more prominent.At this time, the bearing failure frequency appears in the range of about 500Hz-2KHz.

The bearing fault frequency, its harmonics and sidebands can be clearly seen in the vibration velocity spectrum. In addition, the noise horizon increases significantly in the vibration velocity spectrum, and the total peak energy becomes larger and the spectrum is more prominent than in the second stage.At this time, the bearing failure frequency appears in the range of about 0-1kHz.It is recommended to replace the bearing in the late stage of the third stage, then at this time there should have been visible wear and other rolling bearing fault characteristics.

When the temperature increases significantly, the noise intensity changes significantly, the total vibration velocity and vibration displacement increase significantly, and the bearing fault frequency begins to disappear in the vibration velocity spectrum and is replaced by a larger random broadband high-frequency noise horizon.The total amount of peak energy increases rapidly and some unstable changes may occur.Bearings must not be allowed to operate in the fourth stage of failure development, otherwise catastrophic damage may occur.

The above four stages will cause different degrees of damage to the bearing cage. In fact, there will still be many unpreventable problems in our daily work, because it is suggested that the relevant staff should replace the bearing cage once the problem has reached the third stage, so as to avoid more serious failure.

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