Bearing failure mechanism-Wenzhou Bearing wholesale

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Bearing failure mechanism

点击数：5451 日期：2014/4/4

1 contact fatigue failure Contact fatigue failure refers to the working surface of the bearing under alternating stress arising from failure. Contact fatigue spalling in bearing surface, often accompanied by fatigue crack, first from the contact surface following the largest alternating shear stress generated , and then extended to the surface spalling of different shapes, such as point to point pitting or pitting spalling, shallow spalling in the peel into small flakes. Due to the peeling surface gradually expanded, and often deep extended, forming deep spalling. Deep fatigue spalling is source of contact fatigue failure. 2 wear failure The wear failure refers to the failure of the relative sliding friction between the surfaces due to the surface of metal wear and the. Continuous wear will cause damage to bearing parts gradually, and eventually led to the loss of precision bearing size and other related issues. wear may affect the shape change, increased clearance and surface morphology changes, may affect the lubricant or its pollution to a certain extent and cause lubrication complete loss of function, and thus loss of bearing rotation accuracy and not being properly. Wear failure is one of the common failure mode of bearings, according to wear form is usually divided into the abrasive wear and adhesive wear the most common. Abrasive wear is refers to between the working surface of the bearing into the debris and contact surface moves relative to foreign hard particles or hard foreign bodies or metal surface caused by wear, abrasion often cause furrow shaped in the working surface of the bearing. The hard particles or foreign may come from the host or from the host system to other adjacent parts inside the bearing lubrication medium by. Adhesive wear due to the friction surface refers to micro convex or foreign body so that the friction surface uneven force, the lubrication condition deteriorated, due to local friction, easy to cause the friction surface of local deformation and friction micro welding phenomenon, serious when the surface metal possible partial melting, contact force the local friction welding point apart from a substrate and increase the plastic deformation. This adhesive -- tear -- Adhesion Cyclic process adhesive wear, which in general, mild adhesive wear called abrasions, severe adhesive wear called occlusion. 3 failure Failure is mainly due to bearing two factors deficiency and overload. When the load exceeds the limit strength of the material as a result of parts breaking overload fracture. Overload causes the main host of sudden failure or improper installation. Bearing parts of the micro cracks, shrinkage, bubbles , large foreign materials, organizations and local overheating burn defect in defect caused by fracture in severe shock or vibration overload also, known as the defect fracture. It should be noted, bearing in the manufacturing process, the raw materials into the factory reinspection , forging and heat treatment quality control, process control equipment can be correctly analyzed by the existence of the defect, the control must be strengthened in future. But in general, failure mostly overload failure bearing fracture usually appear. Failure 4 clearance change Bearing in the work, due to the impact of external or internal factors, so that the original clearance change, accuracy, and even cause "killed" called the clearance change failure. External factors such as excessive interference, the installation is not in place, the temperature rise caused by swelling heaving, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state, is the main reason that causes the failure of the clearance change. When overload, internal factors such as residual austenite and residual stress in an unstable state, is the main reason that causes the failure of the clearance change.

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