Graphic interpretation of bearing failure mode

Bearing failure is bearing in the process of running a common problem, common bearing failure modes are: fatigue failure, wear and corrosion failure, electric erosion wear, plastic deformation and crack, etc. , today China bearing network in the form of pictures to show you the bearing failure forms, hope to be of help. Fatigue failure of the bearing surface form of fatigue failure is a failure, mainly for fatigue crack initiation, expansion and fracture process, under the alternating load generated by the fault of the long-term effects of the metal. Under the surface fatigue and fatigue failure modes are mainly on the surface of the initial fatigue. Beneath the surface fatigue main forms are: fatigue spalling phenomena, partial load of edge, indentation, and the impact ( As shown in the figure below) On the surface of the initial fatigue: main forms are: improper lubrication and wear of the process ( As shown in the figure below) The cause of the cracks in the two aspects: 1, on the surface, this is because in the work on the surface of the plastic deformation and strain hardening on the surface of the contact stress cyclical changes caused by the effect of external load, and finally on the inner surface of the small crack from development, in the formation of the surface crack between the two, because Xie into the lubricant on the surface of the work, the power of the open, crack down on the wall, crack force to move forward; 2, from the surface, again and again under the pressure of the surface contact, the first where exposed on the surface of the crack depth of a crack, and along the surface direction Angle, to a certain depth, since on the surface of contact area, and beyond the surface, and finally form the corrosion, leaving a horse pit. On the surface, or from the surface of the crack, the two objectives ( Part carburizing, quenching and other surface heat treatment, if after have uneven hardness, organization, and the internal stress of non-uniform and other adverse, the contact stress is generally have the opposite under the influence of ground fissure, if parts surface quality is poor, there is a defect ( Oxidation and decarburization) Poor lubrication, friction or from the surface crack. Between the surface of the wear failure wear failure refers to the relative sliding friction lead to constant wear and tear of the working surface of the metal and the failure. Continuous wear will cause bearing parts damaged gradually, and ultimately result in the loss bearing dimensional accuracy and other related issues. Wear may affect the shape change, the increase of fit clearance and working surface morphology change, may affect the lubricant or make its pollution to a certain degree of lubrication function is lost, so that loss of bearing rotating accuracy and will not operate properly. Wear failure is one of the common failure modes of all kinds of bearings, according to the wear and tear is usually divided into one of the most common form of abrasive wear and adhesive wear. Abrasive wear work refers to the bearing surface between into hard foreign matter or foreign solid particles or abrasive dust on the surface of the metal caused by the relative movement and the contact surface of wear, often cause furrow of abrasion in bearings working surface. Hard particles or other foreign body may come from inside the host, or from the host system adjacent parts sent by lubricating medium inside the bearing. Bearing accuracy of relevant knowledge. Adhesive wear refers to the because of the friction surface microscopic bumps or foreign bodies make the friction surface is uneven, serious deterioration, the condition of lubrication for local friction heat production, easy to cause local deformation and friction surface friction welded phenomenon, serious when the surface of the metal may be the partial melting, contact surface forces from the local friction welding points on the matrix will be torn and increase the plastic deformation. This kind of adhesive - — Tear - — Viscous cycle constitutes the adhesive wear, in general, mild adhesive wear called bruises, serious adhesive wear called occlusion. General bearing wear failure reason mainly has the following kinds: 1, the quality of installation: the bearing clearance adjustment is not good, turn the device center adjust bad local uneven bearing caused all can wear. 2, maintenance does not reach the designated position, insufficient lubrication. Bearing dry grinding heat. 3, lubricating oil quality is bad or use conditions and other factors caused the bearing wear prematurely. 4, bearing type selection is not reasonable, the thrust bearing thrust bearing when using larger body or small bearing weight. 5, poor working conditions, the foreign body into the bearing wear. Corrosion failure