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 ， Solution to abnormal damage of IKO plastic bearing
Solution to abnormal damage of IKO plastic bearing
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
Generally, if plastic bearings are used correctly, they can be used until the fatigue life is reached. 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
2. 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.
As maintenance items in operation, there are rotating sound, vibration, temperature, lubricant state of plastic bearing, etc.Solution to abnormal damage of IKO plastic bearing
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
Generally speaking, the rolling bearing itself in the stainless steel bearing does not produce noise.
The “bearing noise” usually felt is actually the sound effect of vibration between stainless steel bearings and surrounding structures directly or indirectly.
This is why many times the noise problem can be regarded as a vibration problem involving the whole IKO bearing application.
Excitation caused by the change of the number of loaded rolling elements. When a radial load is loaded on a bearing, the number of loaded rolling elements will change slightly during operation, that is: 2-3-2-3 This causes an offset in the direction of the load.
The resulting vibration is inevitable, but can be reduced by axial preloading, which is loaded on all rolling elements.Solution to abnormal damage of IKO plastic bearing
When the waviness of components is closely matched between the bearing ring and the bearing seat or transmission shaft, the IKO bearing ring may be deformed by matching with the shape of adjacent components.
If deformation occurs, vibration may occur during operation. Therefore, it is important to machine the bearing pedestal and drive shaft to the required tolerances.
Local damage due to incorrect operation or installation, a small part of IKO bearing raceway and rolling element may be damaged. During operation, rolling over damaged bearing parts will produce a specific vibration frequency. Vibration frequency analysis can identify damaged bearing components.
Vibration behavior in applications in many applications, the stiffness of IKO bearings is the same as that of surrounding structures.
Because of this feature, as long as the bearing (including preload and clearance) and its configuration in the application are correctly selected, it is possible to reduce the vibration in the application.
There are three ways to reduce the vibration of stainless steel bearings:
1. Remove critical excitation vibration from the application.
2. Suppress the critical excitation vibration between the excitation part and the resonance part.
3. Change the stiffness of the structure to change the critical frequency.