The roughness of the rolling bearing installation surface has a great influence on the quality of the bearing, mainly focusing on wear resistance, matching properties, fatigue resistance, workpiece precision and corrosion resistance.
1. Influence on friction and wear. The effect of surface roughness on part wear is mainly reflected in the peaks and peaks. The contact between two parts is actually the contact of part of the peaks. The pressure at the contact point is very high, which can cause the material to flow in a plastic manner. The rougher the surface, the more serious the wear.
2. Influence on matching properties. There are mainly two forms of bearing installation matching, interference fit and clearance fit. For interference fit, the peaks of the surface are squeezed flat during assembly, resulting in a reduction in interference and a reduction in the connection strength of the component; for clearance fit, as the peaks are continuously smoothed, the degree of clearance will increase. Therefore, surface roughness affects the stability of matching properties.
3. Influence on fatigue resistance. The rougher the surface, the deeper the dents, the smaller the radius of curvature of the trough, and the more sensitive to stress concentration. Therefore, the greater the surface roughness, the more sensitive it is to stress concentration, and the lower its fatigue resistance.
4. Impact on corrosion resistance. The greater the surface roughness, the deeper the trough. In this way, dust, deteriorated lubricating oil, acidic and alkaline corrosive substances are easily accumulated in these dents and penetrate into the inner layer of the material, aggravating the corrosion of parts. Therefore, reducing the surface roughness can enhance the corrosion resistance of parts.
2025-02-14
