Influence of surface roughness on quality of CNC parts

In the machining industry, the surface roughness of mechanical parts is also a part of the quality. How to control the surface roughness in machining, what effect does the surface roughness have on the quality of parts, let’s take a look at it next

In the mechanical parts processing drawings, will indicate the surface roughness processing requirements. If the machining process fails to meet the requirements, the surface roughness of parts has a great impact on the mechanical assembly performance and service life

1. If the surface roughness of the parts can not meet the requirements, the contact area will be reduced, the pressure per unit area will be increased, the contact deformation will be increased, the friction resistance will be increased, and the wear of the parts will be accelerated;
2. The surface roughness affects the fit properties. For clearance fit, the surface roughness is easy to wear, resulting in the rapid increase of clearance. For interference fit, during assembly, it can flatten the small convex peaks, reduce the effective interference, and reduce the strength of fit parts;
3. The surface of the parts is rough and low, and corrosive substances are easy to accumulate at the bottom of the surface, which is difficult to remove, causing surface corrosion;
4. When the part bears the load, the stress concentration is easy to occur at the concave bottom, resulting in cracks and fracture of the part.

In the machining process of mechanical parts, the machining allowance should be reserved for the parts with high surface roughness.

ken. tang@chengcg.com