FAG one-way bearing inspection and troubleshooting steps

The track sound of the bearing and its control method The track sound is a slippery continuous sound that the rolling element rolls on the raceway surface when the bearing is running. It is the unique basic sound that all FAG bearings will produce. The general one-way bearing sound is the rolling sound plus other sounds. The greater the rigidity of the bearing housing, the lower the sound pressure level of the raceway sound. If the radial clearance is too small, the sound pressure level and the main frequency of the raceway sound will increase sharply as the radial clearance decreases.

One-way bearing fatigue failure is a failure of the surface form, mainly manifested by fatigue crack initiation, expansion and fracture processes, and the long-term effects of load failure on the metal. The crack is in two ways:

1. From the surface, this is the external load caused by the cyclic deformation of the plastic surface of the FAG bearing during the rolling contact due to the plastic deformation of the working surface and the strained surface of the strain hardening surface, and finally developed in the small crack. The inner surface, the formation of surface cracks between the two, due to the intrusion of lubricant into the working surface, the open force, severely hitting the wall, forcing the crack to advance;

2, from the surface layer, repeated pressure, surface contact, initially cracked cracks at the surface where the surface is exposed, and the angle along the surface direction, to a certain depth, from the surface of the contact surface, and beyond The surface, and eventually formed an eclipse, leaving a horse pit.

From the surface of the one-way bearing, or from the crack of the surface layer, these two objectives (parts carburizing, quenching and other surface heat treatment, if there is uneven hardness, microstructure, and non-uniform internal stress and other disadvantages, then Contact stress is generally caused by the influence of the opposite underground crack. If the surface quality of the part is poor, there is a defect (oxidation, decarburization), friction or poor lubrication, from the surface crack.

The method of controlling the rolling sound is to select a low-noise FAG bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.

Rolling sound of one-way bearing and its control method Rolling sound is a harsh metal friction sound that can occur in cylindrical roller bearings in all occasions. Most of them occur in grease-lubricated larger type bearings, and the performance of base oil deteriorates. Grease is more likely to occur and hardly occurs when oil is lubricated. In addition, it is more likely to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the model, and it will occur continuously. It will appear intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, the bearing can be selected, or the radial clearance of the FAG bearing can be appropriately reduced, and the grease with excellent performance and the matching with the bearing can be used. rigidity.

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IKO high temperature bearing failure causes and preventive measures

After the high-temperature bearing is installed, check the operation in order to check if the installation is correct. The small machine can be rotated by hand to confirm whether the rotation is smooth. The inspection items have poor operation due to foreign matter, scratches, and indentations. The installation is poor, the torque generated by the mounting is not stable, and the torque is too large due to too small clearance, installation error, and sealing friction. Wait. If there is no abnormality, the power running can be started.

The power running starts from the no-load low speed and slowly increases to the rated operation of the specified conditions. The items to be checked during the test run are whether there is abnormal sound, IKO bearing temperature change, lubricant leakage or discoloration, etc. If an abnormality is found, stop the operation immediately, check the machine, and remove the high temperature bearing check if necessary.

1. Prevention of assembly of foreign objects: IKO bearings are easy to move the iron filings generated during dynamic balancing into the bearing when they are mounted on the rotor. Therefore, it is best to balance the bearings before loading them. Some manufacturers have some oil or grease to lubricate the bearing chamber during assembly. However, it is often difficult for the operator to control the amount. If the oil or grease accumulates in the bearing chamber, the bearing is very rotating. It is easy to enter the inside of the high temperature bearing along the shaft. It is best not to apply oil or grease to the bearing chamber. If it is not painted, it must be controlled not to accumulate in the bearing chamber.

2, the prevention of paint rust: paint rust is characterized by multiple seals in the motor, the motor sounds very good in the assembly, but after some time in the warehouse, the motor abnormally loud, remove the IKO bearing There is severe rust. In the past, many manufacturers thought that it was a bearing problem. After our constant publicity, the motor factory has now realized that it is mainly a problem of insulating varnish. This problem is mainly caused by the acidic substance volatilized by the insulating paint forming a corrosive substance under a certain temperature and humidity, which causes the high temperature bearing to be damaged after the bearing channel is corroded. The problem can only be achieved by selecting a good insulating varnish and venting it after drying for a while.

3. Selection and control of shaft and bearing chamber tolerance: After the bearing is pressed into the bearing, it should be flexible and unobstructed. If the obvious rotation is not flexible, it means that the size of the shaft is too large and the tolerance is lowered. If the IKO bearing is pressed into the shaft and turned by hand, there is a clear "sand" feeling, which may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, it is necessary to control the roundness when controlling the tolerance of the shaft and the bearing chamber. At present, many domestic manufacturers only control the tolerance and do not control the roundness.

4, the assembly of the bearing: Because the bearing is a high-precision product, such as improper assembly can easily damage the IKO bearing channel, resulting in high-temperature bearing damage. The bearing should have a special mold during assembly. It can't be beaten at will. When pressing the shaft, it can only be subjected to small force. When pressing the large circle, it can only be subjected to large force. It is required to use air pressure or hydraulic pressure during assembly. When pressing, the upper and lower touches should be outside the horizontal state. If it is tilted, the bearing channel will be damaged due to the force, which will cause the bearing to produce a sound.

The service life of high-temperature bearings is closely related to manufacturing, assembly and use. It must be done at every stage in order to keep IKO bearings in optimal operation and prolong the service life of bearings.

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