FAG deep groove ball bearing common failures due to the failure analysis

Bearing as the main components of the locomotive, traction motor and axle box bearing, in particular, its function plays an important role in transportation safety, the locomotive runs, online once FAG bearing failure, will cause the whole trains can not run, blocking transportation trunk line, especially the passenger train fails, the negative impact is bigger, once the locomotive bearing failure occurs at the same time, the locomotive repair is very difficult, so as to prevent or reduce the locomotive bearing fault occurs, transportation is very important to the security of locomotive, can in front of the deep groove ball bearing loading would have detected the problems of bearing, ensure that qualified bearing parts get in the car is the focus of this paper. Contact fatigue failure of contact fatigue failure refers to the bearing working surface under the role of alternating stress and failure. Contact fatigue spalling occurred in FAG bearing working surface, often accompanied by fatigue crack, first of all, from the maximum cyclic shear stress under contact surface, and then extended to form a different flake shape, such as dot to pitting corrosion or pitting spalling, peel into small sheet according to the shallow flaking. Due to spalling surface expands gradually, and often to deep extension, forming deep spalling. Deep spalling is contact fatigue failure of fatigue source. 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. Continue to wear will cause a FAG bearing parts damaged gradually, and eventually lead to deep groove ball bearing size accuracy loss 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. Deep groove ball bearing damage is often not a single reason, but under the effect of several aspects comprehensive, under harsh operating conditions to produce vicious circle, cause serious loss of FAG bearing, so after the accident, it is often difficult to determine is caused by what, also bring some difficulties to our relevant measures, convenient for discussion, first from several aspects to analyze the causes of bearing failure. Use after a period of time when the bearing, bearing inner ring, rolling element and cage, outer ring raceway, produce certain defects such as scar, FAG bearing caused by poor lubrication, cause the fever of bearing, long time of fever, causes: 1, the bearing lubricating oil dilution. 2, accelerating the fatigue of the material, hardness decrease. Due to these reasons, and further form vicious circle, accelerated overheating and make the bearing damage. Serious displacement of deep groove ball bearing inner ring, rolling body round, heating, welding together in the end. So in the online operation, such as found bearing severe fever, smoke, don't stop, and should keep running to stand ahead, because this moment overheated bearings in melting state, once the parking is unable to walk again after cooling, the main block.