Bearing failure forms and causes

Bearing is a common precision mechanical basic parts.Due to the rapid development of science and technology, customer demand for bearing the quality of the products is higher and higher.For manufacturers to provide quality products which conform to the standards and meet the equipment performance is very important, but the proper use of the bearing is more important.

Contact fatigue failure

Contact fatigue failure is the failure of bearings working surface under the action of alternating stress.Contact fatigue spalling occurs on the bearing surface of the work, and often accompanied by fatigue crack.It first from the biggest alternating shear stress beneath the contact surface, and then extended to the surface to form different flake shape, such as pitting corrosion or pitting spalling.Peel into small pieces called shallow flaking.Because of peeling off surface gradually expand, it often swell to deep, form deep spalling.Depth of spalling is the source of the contact fatigue failure of fatigue.

Wear failure

Wear failure is due to the relative sliding friction between the surface of the metal work on the surface of a continuous wear caused by the failure.Constant wear and tear will gradually bearing damaged parts, and eventually led to a decline in bearing dimensional accuracy and other related issues.Wear may affect the shape change, the increase of fit clearance and work surface changes, which may influence the lubricant or make it by a certain degree of pollution, which leads to the lubrication function complete loss, result in loss of bearing rotating accuracy, will not operate properly.The wear failure is one of the most common failure modes of the various kinds of bearings.According to the wear and tear form, usually can be divided into one of the most common of abrasive wear and adhesive wear.Abrasive wear refers to the foreign body, bearing working surface between hard particles or hard foreign body or metal surface wear debris and relative motion caused by the wear of contact surface.It often work on bearing surface scratch of trench.Hard particles or foreign bodies may be from other adjacent parts, the host or the host system and lubrication medium into the bearing inside.Adhesive wear is due to the friction on the surface of a tiny bumps or foreign bodies caused by the uneven force on the friction surface, when the lubrication condition worse, local friction will generate heat, this is easy to cause local deformation and friction surface microscopic friction weld.At this point, the surface of the metal may be part of the melt, and the force on the contact surface will be torn off from the base plate local friction welded joint, and increase the plastic deformation.Adhesive - tear - adhesive cycle structure adhesive wear.In general, mild adhesive wear is called a scratch, and serious adhesive wear called occlusion.

The fracture failure

Bearing failure is the main reason of the defects and overload.When an external load than ultimate strength of the material and parts fault, called overload fracture.Overload is the main reason why the sudden failure of the host or incorrect installation.When impact overload or violent vibration, such as micro cracks, shrinkage cavity, bubbles, big foreign body, the organization of overheating and bearing parts localized burns and other defects will cause fracture in defect, which is referred to as a defect.It should be noted that in the process of bearing manufacturing, raw material review, forging and heat treatment quality control and process control can be used to correctly analyze the existence of the above phenomenon.Instruments mentioned in the defect, we must strengthen control in the future.But generally speaking, the most common bearing fracture failure is overload failure.

Clearance change failure

When the bearing is working, as a result of the influence of external or internal factors, the original fit clearance changed, reduces the accuracy, even "killed" known as the clearance change failure.Clearance failure is the main reason of the external factors, such as excessive interference, improper installation, temperature rise caused by inflation, instantaneous overload, etc., as well as internal factors, for example in the unstable state of residual austenite and residual stress.

Supplier

BMB Bearings ia a precision bearing enterprise specializing in the production of double row angular contact ball bearings, double row deep groove ball bearings, and single row angular contact ball bearings. The company is a end bearings manufacturer enterprise producing double row angular contact ball bearings in China. Its models cover 3200 series, 3300 series, 3000 series, 3800 series, 3900 series, etc. The product accuracy grades are: P0, P6, P5, P4, and the products are widely applicable.
The company also maintains an extensive inventory of superior roller bearings, ball bearings, Deep Groove Ball Bearings, Selfaligning ball bearing, Angular Contact Ball Bearings, Thrust Ball Bearings and much more.