Railway wagon profile in the rolling bearing faults

Railway wagon profile in the rolling bearing faults - 2019 10 - 26 railway wagon wheel with bearing is usually made by the inner and outer ring, roller, retainer, grease and seal etc. When bearing, roller bearing inner and outer ring and bear the role of high frequency, stress, load concentration effect on the rolling linear area is very narrow, so the bearing parts at work, per unit area on the surface of the roller and the ring to bear a lot of stress, general n/was as high as 1500-5000. Exists not only between rollers and ring rolling, sliding, and so there can also be a sliding friction between rollers and ring, bearing component of the working conditions and stress is very complex. Railway freight car rolling bearing is a kind of typical contact fatigue under parts, because the contact fatigue resistance is material performance of a system, so it is difficult to come to the conclusion that a simple material organization structure on the effect of contact fatigue performance, but the practice prove that there is close relationship. In general, in the contact fatigue crack initiation is the dominant process, therefore the higher the material hardness, crack initiation, the more difficult to contact fatigue life is also more long. In the process of the actual rolling or sliding contact, the surface will happen different degree of plasticity in shape and work hardening phenomenon, namely the cyclic hardening can improve the surface hardness, so that the actual work is not the original hardness material, but the actual hardness after hardening. According to the form using the scene all may find fault bearing damage can be divided into the following several types: stripping, raceway grinding skin, race, color, race, pitting, corrosion, raceway surface rough, electric erosion, and bearing saddle poor contact, crack or split, knock against injury, micro wear, dent, indentation, etc. （ Source: the resources of railway vehicle platform)