The main form of rolling bearing fault - bearing knowledge

1. Fatigue spalling of rolling bearing inner and outer surface of raceway and rolling element load and relative rolling, as a result of the action of alternating load, first of all, at certain depth below the surface of ( Maximum shear stress) Crack formation, and then extend to the contact surface spalling pit in the surface layer, and finally to large peeling, this kind of phenomenon is the fatigue spalling. In the operation of fatigue spalling can cause impact load, vibration and noise. 2. Wear due to dust and the invasion of the foreign body, relative motion can cause surface of raceway and rolling element wear and lubrication bad will aggravate the wear, the wear of the bearing clearance increases as a result, the surface roughness increases, reduces the bearing running accuracy, and thus reduce the movement precision of the machine, vibration and noise is increased. For precision machinery bearings, is often wear limit bearing of life. 3. Plastic deformation when bearing is excessive impact load and static load, or the additional load caused by the thermal deformation, or will have a high hardness of foreign intrusion on raceway surface form dents or scratches. This will make the bearing severe vibration and noise in the process of operation. And once the creasing, indentation caused by impact load will further the cause of near surface spalling. 4. Rust corrosion is one of the most serious problem of rolling bearing, high precision bearing may be due to surface corrosion caused loss of accuracy and cannot continue to work. Water, acid or alkaline substances directly shooting will cause bearing corrosion. After the bearing to stop working, bearing temperature drop dew point, moisture in the air condenses into water droplets are attached to the bearing surface can also cause corrosion. In addition, when bearing inside is energized, the current may be through the contact point on the raceway and rolling body, thin oil film caused by edm and produce electric erosion, uneven washboard form is formed on the surface. 5. Fault fracture may cause excessive load bearing parts. Improper grinding, heat treatment and assembly can cause residual stress and thermal stress at work too big can also cause fracture bearing parts. In addition, improper assembly method, assembly technology, can also cause bearing ring guard and roller chamfer impellers. 6. Agglutination in the case of bad lubrication, high speed heavy work, fever, because of friction bearing parts can reach very high temperature in a very short period of time, lead to surface burns and agglutination. So-called agglutination refers to a component on the surface of a metal adhesive to another part components on the surface of the phenomenon. 7. Cage damaged due to improper assembly or use may cause deformation of cage, increase it and rolling friction between the body, even make some card roller die can't scroll, may also cause cage and the internal and external ring friction and so on. The damage will be further exacerbated vibration, noise and heat, result in bearing damage.