In machining, the process of achieving high accuracy and surface quality requirements for a workpiece. Generally, it is performed after rough machining and semi finishing. Finishing can be divided into high gloss and precision grinding, including precision grinding, ultra precision grinding, and mirror grinding. Using precision machining technology can comprehensively improve the machining accuracy and surface quality of the workpiece.

The residual area during finishing machining is small, and the adverse effects of cutting force, cutting heat, and vibration are eliminated to the maximum extent. Therefore, the surface deterioration layer left by the previous process can be effectively removed. After machining, the surface is basically free of residual tensile stress, and the roughness is greatly reduced, greatly improving the quality of the processed surface.