Koyo import bearing damage screening and countermeasures - bearing knowledge
Koyo import bearing fatigue failure is a failure surface form, main performance for fatigue crack initiation and extension, and the fracture process, under the alternating load generated by the fault of the long-term effects of the metal.
Cracks in two aspects: 1, on the surface, this is Koyo import bearing in the process of rolling contact, because of the work in the plastic deformation and strain hardening on the surface of the contact stress on the surface of the cyclical changes caused by the effect of external load, and finally on the inner surface of the small crack from the development, the formation of 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.
Imports from Koyo bearing 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.
Roll along the acoustic method is: low noise Koyo of imported bearing is bearing waviness is very small, that is, carefully select and use conditions.
Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise.
Bearing under the correct use, can have a long life.
If the occurrence of premature damage, it is possible that selection errors, caused by improper use, or bad lubrication.
Therefore, when installing a Koyo import bearing, we need to record the machine type, installation site, the using conditions and the surrounding.
Through research summarizes the type of bearing damage, the use of the environment, if a problem occurs in order to avoid similar situation from happening again.