Effect on fatigue strength:

The tiny peaks and valleys on the outside of the bearing, like many corners, notches and cracks, are the origin of the stress concentration of bronze-based bearings. When the bearing is under alternating load, the fatigue strength will be reduced due to the presence of stress concentration. Rough appearance, fatigue strength decreased. Therefore, the bearing surface under the action of alternating stress should reduce the roughness, especially the bearing steel.

Effect on corrosion resistance:

Bearing surface and air, water vapor and other thrust gasket corrosive substances, due to chemical and electrochemical effects, corrosion occurs. The bearing surface is rough, because the valley is deep and corrosive substances are likely to accumulate, thereby reducing the corrosion performance of the alloy. In particular, electrochemical action continues. Gradually deepening from the bottom and expanding the corrosion of the bearing profile may cause the bearing to malfunction. Therefore, bearings in severely corrosive environments should have a small surface roughness.

Impact on contact stiffness and positioning accuracy:

When the two rough surfaces come in contact with each other under pressure, and with the peaks, the bearings are easily deformed (including elastic and plastic deformation) due to the contact of the smaller rough surfaces, thereby reducing contact stiffness and positioning accuracy. Therefore, in order to improve the contact stiffness, the appearance roughness is reduced. Bearing knowledge

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

Friction, effects of wear:

The rough surface of the bearing has a large coefficient of friction. Relative to the appearance of the movement, frictional resistance, in addition to increased power consumption, so that the bearing heat, working conditions deteriorate; but also because the actual contact area of ​​the two surface contact is small, the pressure per unit area increases, exacerbating the wear. At the same time, due to the rough appearance, embossed appearance, increased engagement, will increase wear.

However, if the appearance is too smooth, the attraction of the two surfaces increases, storage, and it is also beneficial to the lubricating oil, will increase friction and wear increase. Therefore, the contact surface should have an appropriate roughness.