The influence of bearing surface roughness on bearing life generally has the following aspects:

The tiny peaks and valleys on the bearing surface, like many angles, gaps and cracks, are the origin of stress concentration. When the bearing is under the action of alternating load, the fatigue strength will be reduced due to the existence of stress concentration. Rough appearance and reduced fatigue strength. Therefore, bearing surface roughness should be reduced under the action of alternating stress, especially bearing steel.

Bearing surface and air, water vapor and other corrosive substances, due to chemical and electrochemical action, corrosion phenomenon will occur. Bearing surface rough, corrosive substances easy to accumulate, thus reducing the corrosion performance of alloy. In particular, electrochemical action continues. Gradually deepen and expand the corrosion of the bearing contour from the bottom, which may cause sudden failure of the bearing. Therefore, bearings in severely corrosive environments should have small surface roughness.

When two rough surfaces contact, contact under pressure, and the peak, because the smaller rough surfaces contact, the bearing is prone to deformation (including elastic and plastic deformation), thereby reducing the contact stiffness and positioning accuracy. Therefore, in order to improve the contact stiffness, reduce the surface roughness.

In addition to the above effects, surface roughness also affects coordination performance, sealing and fluid friction resistance.

The friction coefficient of the rough bearing surface is large. Relative to the appearance of movement, friction resistance is large, in addition to increased power consumption, so that the bearing heating, working conditions deteriorate; Also because the actual contact area of the two surfaces is small, the pressure per unit area increases, aggravating wear. At the same time, due to rough appearance, uneven appearance embedded, increased meshing, will increase wear.

However, if the surface is too smooth, the attractiveness of the two surfaces increases, storage, but also conducive to lubricating oil, will increase friction and wear increase. Therefore, the contact surface should have appropriate roughness.

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