Wear failure of INA self-aligning ball bearings is a common problem. In general, if the INA bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and are not resistant to use. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.
Contact fatigue failure refers to the failure of the INA bearing working surface to be affected by alternating stress. Contact fatigue spalling occurs on the bearing working surface, often accompanied by fatigue cracking, first from the maximum alternating shear stress below the contact surface, and then extended to the surface to form different peeling shapes, such as pitting or pitting. Peeled into small pieces called shallow peeling. Due to the gradual enlargement of the exfoliation surface, it tends to expand deeper and form deep exfoliation. Deep exfoliation is the source of fatigue in contact fatigue failure.
Wear failure refers to the failure of the relative sliding friction between the surfaces resulting in the continuous wear of the metal on the working surface. Continued wear and tear will cause gradual damage to the INA bearing parts and eventually lead to loss of dimensional accuracy of the self-aligning ball bearings and other related problems. The wear of the crucible may affect the shape change. The increase of the clearance and the change of the surface of the working surface may affect the lubricant or cause the pollution to a certain extent, resulting in complete loss of the lubrication function, thus causing the bearing to lose the rotation precision or even the normal operation.
1, bearing maintenance, overhaul, and abnormal handling
In order to maintain the original performance of the self-aligning ball bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.
As a maintenance item during operation, there are INA bearing rotation sound, vibration, temperature, lubricant status, and so on.
2, bearing damage and countermeasures
Regarding the damage state of the bearing, for example, the jam of the ferrule of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the foreign matter intrusion, the alignment of the self-aligning ball bearing, the shaft If the deflection is too large, there will be coincidences of these reasons.
Therefore, it is difficult to know the true cause of the damage by only investigating the bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the INA bearing, and the situation before and after the accident, combined with the damage state of the self-aligning ball bearing and several reasons, it can prevent similar accidents from happening again.
