In the process of implementing GB 1031-83 "surface roughness, parameters and their values", how to correctly understand the meaning of surface roughness and surface defects, and to distinguish and evaluate them properly is an important issue. Surface roughness refers to the microscopic geometric properties of a small pitch and valley on the machined surface. On the machined surface, it is usually represented by the tool marks left by the cutting of the tool; the grinding of the grinding wheel
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