Contact fatigue failure refers to the failure of the working surface of plastic bearing under the action of alternating stress. Contact fatigue spalling occurs on the working surface of bearing, which is often accompanied by fatigue cracks. It first occurs from the large alternating shear stress below the contact surface .
Then it extends to the surface to form different spalling shapes, such as pitting or pitting spalling, and spalling into small flakes is called shallow spalling. Due to the gradual expansion of the spalling surface, it often expands to the deep layer, forming deep spalling. Deep spalling is The fatigue source of contact fatigue failure.
Solution to abnormal damage of IKO plastic bearing
Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage to plastic bearing parts, and eventually lead to the loss of dimensional accuracy of IKO bearing and other related problems.
Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting in the complete loss of lubrication function, so that the bearing loses rotation accuracy and even cannot be aligned Normal operation.Solution to abnormal damage of IKO plastic bearing
Bearing damage and Countermeasures
The bearing can reach the service life if the plastic is normal. However, there will be accidental and premature damage, which is not resistant to use. This early damage, as opposed to fatigue life, limits the use of quality known as failure or accident. Most of them are caused by careless installation, use and lubrication, foreign matters invading from the outside, and insufficient research on the thermal effects of shafts and shells.Solution to abnormal damage of IKO plastic bearing
Maintenance, overhaul and abnormal handling of bearings
In order to maintain the original performance of IKO bearing in good condition for as long as possible, it is necessary to maintain and repair in order to prevent accidents, ensure the reliability of operation and improve productivity and economy. Maintain the operation standard of corresponding mechanical operation conditions and carry out it regularly. The contents include monitoring the operation status, replenishing or changing lubricants, and regular disassembly inspection.Solution to abnormal damage of IKO plastic bearing
As maintenance items in operation, there are rotating sound, vibration, temperature, lubricant state of plastic bearing, etc.
As for the damage state of the bearing, for example, the clamping of the retaining edge of the ring of the roller bearing can be considered as the reason. These reasons can also coincide with insufficient lubricant, unsuitable, defects of the oil supply and drainage structure, intrusion of foreign matters, installation error of IKO bearing and excessive deflection of the shaft.Solution to abnormal damage of IKO plastic bearing
Therefore, only investigating the bearing damage, it is difficult to know the real cause of the damage. However, if we know the use machinery and conditions of the bearing, the structure around the plastic bearing, the situation before and after the accident, and combined with the damage state of IKO bearing and several causes, we can prevent the recurrence of similar accidents.Solution to abnormal damage of IKO plastic bearing
Solution to abnormal damage of IKO plastic bearing
The clearance of plane bearing refers to the large amount of activity made by the other ring along the radial or axial direction when one ring is fixed, so the clearance is divided into radial clearance and axial clearance. When assembling IKO bearing, the clearance shall not be too large or too small. Too large clearance will reduce the number of rolling elements bearing load at the same time and increase the load of a single rolling element, so as to reduce the rotation accuracy and service life of IKO bearing;
If the clearance is too small, the friction will increase, the heat generated will increase, and the wear will be intensified, which can also reduce the service life of the bearing. Therefore, the clearance of plane bearing should be strictly controlled and adjusted during assembly.
Preloading is to give an axial force to the inner ring or outer ring during the assembly of plane bearing, so as to eliminate the clearance of IKO bearing and produce initial deformation at the contact between the rolling element and the inner and outer rings. Preloading can improve the stiffness and rotation accuracy of the bearing in the working state.
Most bearings with large load and high rotation accuracy requirements work in the state of no clearance or even a small amount of interference. In this case, it is necessary to preload the bearing during assembly. The clearance adjustment and pre tightening are usually completed by making appropriate axial relative displacement of the inner ring to the outer ring.