Influence of surface roughness on machining of CNC parts

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

The machining requirements of surface roughness will be indicated on the machining drawing of mechanical parts. 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, mainly in four aspects:

1. If the surface roughness of parts is not reached, 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 parts will be accelerated;
2. The surface roughness affects the fitting properties. For the clearance fitting, the surface roughness is easy to wear, resulting in the rapid increase of the gap. For the interference fitting, the small convex peak can be flattened during assembly, the effective interference can be reduced, and the strength of the fitting parts can be reduced;
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 not easy to remove, resulting in surface corrosion;
4. When the part bears load, stress concentration is easy to occur at the concave bottom, resulting in cracks and part fracture.

In the machining process of mechanical parts, the parts with high requirements for surface roughness shall be finished with machining allowance. The above is about the influence of surface roughness in machining mechanical parts. Thank you for your attention!

ken. tang@chengcg.com