What is the selection of surface roughness for mechanical processing in Dongguan?

The surface roughness of Dongguan mechanical processing is an important technical indicator reflecting the micro geometric shape error of the part surface, and is the main basis for inspecting the surface quality of the part; The rationality of its selection directly affects the quality, service life, and production cost of the product.
There are three methods for selecting surface roughness in Dongguan mechanical processing, namely calculation algorithm, experimental method, and analogy method. The most commonly used method in mechanical component design is analogy, which is simple, rapid, and effective. The application of analogy method requires sufficient reference materials, and various existing mechanical design manuals provide comprehensive information and literature. The most commonly used is the surface roughness that is compatible with the tolerance level. In general, the smaller the dimensional tolerance requirement for mechanical parts, the smaller the surface roughness value of the mechanical parts, but there is no fixed functional relationship between them. For example, the decorative surfaces of handles, handwheels, sanitary equipment, and certain mechanical parts on some machines and instruments require smooth processing, with high surface roughness requirements, but low dimensional tolerance requirements. In general, there is a certain correspondence between the tolerance level and the surface roughness value of parts with dimensional tolerance requirements.