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, locomotive running online, once the fault of the bearings, 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 bearing loading would have detected the problems of bearing, ensure that qualified bearing parts get in the car is the focus of this paper.
2 of the bearing fault SKF Bearing Static Load Rating http://www.skf-nsk.org/ .
Bearing damage, often is not a single cause, but under the effect of several aspects comprehensive, under harsh operating conditions to produce vicious circle, cause serious loss bearing, so after the accident, it is often difficult to determine is caused by what, also give us relevant measures to bring certain difficulties, convenient for discussion, first from several aspects to analyze the causes of bearing failure.
2.1 bearing abnormal abrasion
2.1.1 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, cause poor lubrication of bearing, cause bearing of fever, fever for a long period of time, can lead to: (1) the bearing lubricating oil dilution. (2) accelerate the fatigue of material, hardness decreased. Due to these reasons, and further form vicious circle, accelerated overheating and make the bearing damage. Serious displacement of 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.
dot deformation and sulfide inclusions; After VD treatment, Al2O3 and dot deformation inclusions significantly reduced, and contains calcium, magnesium, aluminum, such as sulfur compound inclusions increased; Not found in timber specimen dot deformation inclusion, only a small amount of small size of Al2O3, sulfide and calcium, magnesium, aluminum, sulfur and other composite inclusions; The refining process, the mixed quantity is on the decline. Inclusions, chromium iron chromium acid salt mainly and dissolved oxygen in molten steel reaction generated; Aluminum oxide inclusions mainly comes from the aluminium deoxidizing products; Which is mainly composed of calcium aluminate dot deformation inclusions from deoxidizing products, and the calcium and magnesium from lining and slag. Sulfur from sulfur and sulfide in steel form elements Ca, Mn, such as chemical reaction, nucleation some such as alumina oxide as the core.