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SKF bearings failure form and design constraints
Jan 13, 2018

SKF bearings are the main forms of failure are:

1, fatigue pitting

Practice has proved that there is proper lubrication and sealing, installation and maintenance conditions are normal, the vast majority of bearings rolling along the ferrule rolling in contact with each other in the surface of the body have varying contact stress, after a certain number of cycles, the Stress causes microscopic cracks that form beneath the surface not deep. Microcosmic cracks are infiltrated into the lubricant cracks caused pitting.

2, plastic deformation

In the case of excessive static load and impact load, non-uniform plastic deformation pits appear on the raceways of rolling elements or ferrules. This happens in the case of very low speed or swing bearing.

3, abrasive wear, adhesive wear

SKF bearings in the seal is not reliable and dusty working conditions, prone to abrasive wear. Usually between the rolling element and the ferrule, especially the sliding friction between the rolling element and the cage. If the lubrication is not good and the heat is serious, the rolling element may be temper or even cause the adhesive wear. The higher the speed, the more severe the wear.

In addition due to improper installation, removal and operation can cause damage to the bearing components such as rupture, which should be avoided.

Check to meet the design constraints is to avoid bearing failure, to ensure that the bearing can work within the prescribed deadline. In general, the main failure modes of bearings under different conditions are different. For medium-speed bearings, the main failure form is fatigue pitting. The design constraint is to ensure that the bearing has sufficient fatigue life, which should be checked and calculated according to the fatigue life. For high-speed bearings, excessive wear and burns often occur due to the large heat generation , The design constraints in addition to ensuring the bearing has a sufficient fatigue life, it should also limit the speed does not exceed the limit, that is, in addition to the life calculation, but also check the limit speed; for non-rotating or very low speed bearings, which The main form of failure is to produce excessive plastic deformation, design constraints are to prevent excessive plastic deformation, the need for static strength of the calculation of the check.

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