Bearing fault analysis, In order to improve the reliability of the Surface Fatigue working surface, an important part of system engineering is the bearing (the working function of the bearing is in its specified loss, resulting in failure or non operation as a failure phenomenon is called
(bearing failure can be divided into two types according to their normal life failure and early failure. This is mainly to analyze the causes of early failure of bearings caused by pitting corrosion and fatigue and put forward improvement suggestions to improve the service life and reliability of Koyo imported bearings.
The fatigue failure of Koyo bearing is a surface form of failure, which is mainly manifested in the Surface Fatigue initiation, propagation and fracture process of fatigue crack, and the long-term impact of load failure under alternation. Cracks are in two ways:
1： On the surface, this is the effect of external load caused by the plastic deformation on the Surface Fatigue working surface and the periodic change of contact stress on the strain hardened surface
during the rolling contact process of Koyo imported bearing, and finally the formation of surface cracks between the two from the developing inner surface, due to Surface Fatigue the lubricant and opening force on the working surface, Crack down on the wall and force the crack to move forward;
the contact of the surface will Surface Fatigue initially produce cracks at a certain depth at the place where the surface is exposed,
and from the angle along the surface direction to a certain Surface Fatigue depth, from behind the surface of the contact surface, and beyond the surface, and finally form corrosion stripping, leaving a horse pit.
From the surface, or from the cracks in the surface layer, the two objectives (carburization, Surface Fatigue quenching and other surface heat treatment of parts, if there is uneven hardness, microstructure, and non-uniform internal stress and other disadvantages,
the contact stress is generally affected by the opposite Surface Fatigue underground cracks. If the surface quality of parts is poor, there is a defect (oxidation, decarburization), Poor friction or lubrication, cracks from the surface.
Do not tighten the bolts fixing the German fag bearing seat first, and make the bearing sleeve rotate in the bearing seat. Then fasten the bearing seat bolts. Similarly, install the bearing and seat at the other end of the same shaft, rotate the shaft for several turns, and let the German fag bearing itself automatically align its position.
Apply lubricating oil on the mating surface of bearing pedestal and bearing, and install the German fag bearing into the bearing pedestal. Then put the assembled bearing on the shaft together with the German fag bearing seat. Push it to the required position for installation.
Before installing the German fag bearing on the shaft, the fixing pin of the bearing sleeve must be pulled out, the surface of the journal must be polished smooth and clean, and the journal shall be coated with oil for rust prevention and lubrication (the bearing is allowed to rotate slightly on the shaft).
Clean the dust on the fan to avoid dust entering the bearing during installation;