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Quality Judgment Of FAG Bearings

Source:  skf bearing  Time:  2020-09-29

After the FAG bearing is installed in the host, if the radial runout of the main shaft is measured, it can be found that the measured value of each revolution has a certain change; when continuous measurement is performed, it can be found that after a certain number of revolutions, this change will be approximately Repeatedly. The index to measure the degree of this change is the cyclic rotation accuracy. The number of revolutions required for the change to reappear approximately represents the "quasi-period" of the cyclic rotation accuracy. The magnitude of the change in the quasi-period is large, which is the cyclic rotation accuracy. 

If proper preload is applied to the spindle, the speed will be gradually reduced to close to the compulsory speed to carry out the "run-in" effect of the bearing, which can improve the cycle rotation accuracy of the spindle.


The main factors used for adjustment are installation, use and maintenance, maintenance and repair, etc. that meet the technical requirements. According to the technical requirements of FAG bearing installation, use, maintenance, and maintenance, the operation of bearing contact load, speed, temperature, vibration, noise and lubrication status monitoring and inspection, find abnormalities immediately find the cause, adjust and return to normal. The installation condition is one of the factors that use the bearing is the primary factor that often causes an incorrect load-bearing state change between the parts of the installation package, which ends in an abnormal operating state and early life.


1. Contact fatigue failure

Contact fatigue failure refers to the failure of FAG bearing working surface subjected to alternating stress. Contact fatigue spalling occurs on the working surface of the bearing, and it is often accompanied by fatigue cracks. It first occurs from the maximum alternating shear stress below the contact surface, and then spreads to the surface to form different spalling shapes, such as pitting or pitting. Peeling into small pieces is called shallow peeling. Due to the gradual expansion of the exfoliation surface, it tends to expand deeper and form deep exfoliation. Deep spalling is the fatigue source of contact fatigue failure.
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2. Wear failure

Wear failure refers to the failure caused by the continuous sliding wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continued wear and tear will cause gradual damage to bearing parts, and eventually lead to loss of dimensional accuracy of FAG bearings and other related problems. Wear may affect the shape change, the increase in the clearance and the change in the surface morphology of the working surface may affect the lubricant or contaminate it to a certain degree and cause the lubricating function to be completely lost, so that the bearing loses its rotational accuracy and even cannot operate normally. Wear failure is one of the common failure modes of various types of bearings. According to the form of wear, it can be divided into the most common abrasive wear and adhesive wear.


1) Instrument testing

Use a spectrometer or SPM or a new VIB05 tester to determine the running state of the bearing to determine whether it should be maintained or replaced. It is the most convenient and reliable method.

For example, when using the VIBO5 detector, this is a newly designed machine condition detection instrument based on a microprocessor, which has vibration detection, FAG bearing condition analysis and infrared temperature measurement functions. Its simple operation and automatic indication of status alarms are very suitable for on-site equipment operation and maintenance personnel to check the equipment status, find problems in time, and ensure the normal and reliable operation of the equipment.


Using such an instrument, you can make full use of the bearing's working potential, guarantee the bearing in time, and avoid failures. It is more suitable for young staff to make up for the lack of experience.


2) Manual detection

In places where the above-mentioned instruments are not available, a monitoring tool modified by a medical stethoscope-like device can be used for testing. Experienced operators can also use a round bar or a wrench to touch the part of the machine shell closest to the bearing, and use the ear to monitor through the tool The running sound of the bearing.

Normal FAG bearing operation sound should be uniform, stable and not harsh, while abnormal bearing operation sound is intermittent, shocking or harsh.

The bearings sold by Eric Bearings Limited are of excellent quality, and the price is much cheaper than other distributors. The products are exported to more than 50 countries and regions in the world, winning wide acclaim from customers and establishing long-term cooperative relations with them. In order to expand the scope of business, we also hope to establish trade relations with more customers and develop together.