The effect of fatigue pitting on precision bearing troubleshooting

Rolling body by the load, rolling body and the contact surface of the inner and outer ring will produce contact stress, inner and outer ring and rolling body in the work of relative rotational movement, so the contact stress will change, contact stress exceeds the specified value, fatigue cracking occurs under the surface, gradually expand to the surface, causing fatigue pitting of the inner and outer ring rolling body surface, resulting in precision bearing rotational accuracy, noise, shock and vibration loss. So pitting is a form of rolling precision bearing failure, then, the following together to understand the impact of fatigue pitting on precision bearing troubleshooting it!

Ways to increase the service life of precision bearings:

Precision bearing life and production, manufacturing, installation applications are closely related, so do a good job in all stages, in order to make precision bearings to achieve operating conditions, increase the use of precision bearings period.

1.The selection and operation of the dimensional tolerances of the shaft and bearing chamber: after the bearing is pressed into the bearing, it should be able to rotate easily and without sliding blocks. When it is obvious that the rotation is not easy, the size of the shaft is too large, please reduce the size tolerance. If, after the precision bearing has been pressed into the shaft, there is a noticeable "loose" feeling of good rotation, the dimensional tolerance of the shaft may be large, or the concentricity of the shaft may be poor. Therefore, in the precision bearing and precision bearing room size tolerance control, get good concentricity, in this stage many Chinese manufacturers can only operate the size tolerance, no concentricity.

2. Installation method: As precision bearings are high-precision goods, poor installation is easy to damage the cross-section of precision bearings, thus damaging the bearings. The installation of precision bearings need special type of shell, can not just knock. Once you press the shaft, apply force to the circle only, once you press the big circle, apply force to the big circle only. When installing standard air pressure or hydraulic machine, left and right outward riveting level, if deflection occurs, the section of the bearing will be damaged by the precision bearing, the precision bearing wire will be broken.

3. Avoid dirty will: bearing placed on the motor rotor to achieve the dynamic balance of the rotor, due to the dynamic balance of the rotor and the iron pin is easy to put into the precision bearing, so in the installation of the bearing before the rotor to maintain a good dynamic balance. Some manufacturers in order to facilitate the installation of the bearing chamber to install oil or vegetable oil to wet the actual effect, but the actual operator is difficult to control the amount of oil or vegetable oil in the precision bearing chamber, if there is a lot of oil or vegetable oil in the chamber, then the rotation of the bearing will follow the shaft and adhere to the precision bearing precision bearing chamber do not apply oil or vegetable oil. Need to apply, operation, please do not accumulate in the precision bearing chamber.

4, the prevention of lacquer rust: lacquer rust is characterized by the multiplicity of closed motors, motor installation sound very good, but after a period of time placed in the warehouse, precision bearing motor sound becomes very large, dismantling down the bearing has a more serious rust situation. Previously, many manufacturers believe that the precision bearing problem.