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Failure Forms and Design Constraints of SKF Imported Bearing
Jan 21, 2019

The common failure modes of SKF imported bearings are as follows:


1. Fatigue pitting


Practice has proved that most bearings with proper lubrication and sealing, installation and maintenance conditions are normal, because the rolling bodies roll along the ring, there are varying contact stresses in the surface of the contacting objects. After a certain number of cycles, this stress will lead to micro-cracks in the lower surface. The micro-cracks are extruded by the lubricating oil infiltrated into them and cause pitting corrosion.


2. Plastic Deformation


Under the action of excessive static load and impact load, uneven plastic deformation pits appear on the rolling body or raceway of ring. This often happens in bearings with very low rotational speed or swing.


3. Abrasive Wear and Adhesive Wear


SKF imported bearings are prone to abrasive wear when working under unreliable seal and dusty operation conditions. Usually there is sliding friction between the rolling body and the ring, especially between the rolling body and the cage. If the lubrication is not good and the heating is serious, it may temper the rolling body, or even cause bonding wear. The higher the speed, the worse the wear.


In addition, due to abnormal installation, disassembly and operation will also cause damage to bearing components such as rupture, which should be avoided.


The main design constraints to be met during verification are to avoid bearing failure, so as to ensure that the bearings can work normally within the prescribed time limit. Generally, the main failure modes of bearings are different under different working conditions. For bearings running at medium speed, the main failure mode is fatigue pitting corrosion. Design constraints are to ensure that bearings have sufficient fatigue life and should be checked and calculated according to fatigue life. For high-speed bearings, excessive wear and burns often occur due to high heating. Design constraints should not only ensure that bearings have sufficient fatigue life, but also limit their rotational speed to no more than the limit value, that is to say, in addition to high-speed bearings. In addition to life calculation, the limit speed of bearings must be checked. For bearings with no rotation or very low rotation speed, the main failure mode is to produce excessive plastic deformation. Design constraints are to prevent excessive plastic deformation, which requires static strength checking calculation.


In addition, the design of the bearing combination structure is reasonable, to ensure adequate lubrication and reliable sealing, which is very important to improve the life of bearings and ensure normal work.