Several main aspects of surface roughness

  1. Surface roughness affects the wear resistance of parts. The rougher the surface, the smaller the effective contact area between mating surfaces, the greater the pressure, and the faster the wear.
  2. Surface roughness affects the stability of matching properties. For clearance fits, the rougher the surface, the easier it is to wear, causing the gap to gradually increase during work; for interference fits, the actual effective interference is reduced due to the flattening of microscopic convex peaks during assembly. the strength of the connection.
  3. Surface roughness affects the fatigue strength of parts. There are large troughs on the surface of rough parts, which, like sharp corners and cracks, are sensitive to stress concentration, thus affecting the fatigue strength of the part.
  4. Surface roughness affects the corrosion resistance of parts. A rough surface can easily allow corrosive gases or liquids to penetrate into the inner layer of metal through microscopic valleys on the surface, causing surface corrosion.
  5. Surface roughness affects the sealing of parts. Rough surfaces cannot fit tightly together, and gas or liquid leaks through the gaps between the contact surfaces.
  6. Surface roughness affects the contact stiffness of parts. Contact stiffness is the ability of the joint surface of parts to resist contact deformation under the action of external forces. The stiffness of a machine depends largely on the stiffness of the contact between the various parts.
  7. Affect the measurement accuracy of parts. The surface roughness of the measured surface of the part and the measuring surface of the measuring tool will directly affect the accuracy of the measurement, especially in precision measurement.

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