With the continuous development of machine tools and cutting tools, the accuracy, efficiency and automation of machining are continuously improved, and the scope of application is also expanding, which greatly promotes the development of modern machinery manufacturing industry. According to the material removal rate and machining accuracy, machining can be divided into rough machining, semi finishing machining, finishing machining, finishing machining, ultra precision machining, etc.
(1) Rough machining is a machining method that uses a large cutting depth, cuts most or all of the machining allowance from the workpiece after one or a few times of cutting, such as rough turning, rough planing, rough milling, drilling and sawing. Rough machining has high efficiency but low precision, and is generally used for pre machining;
(2) Semi finish machining is generally used as an intermediate process between rough machining and finish machining;
(3) Finish machining is to use the method of fine cutting to make the machined surface achieve high precision and surface quality, such as finish turning, finish planing, finish reaming, finish grinding, etc. finish machining is generally the final machining.
(4) Finishing is carried out after finishing. Its purpose is to obtain smaller surface roughness and slightly improve accuracy. The machining allowance of finishing is small, such as honing, grinding, ultra precision grinding and ultra precision machining;
(5) The purpose of finishing is to reduce the surface roughness, improve the anti-corrosion, dust-proof performance and improve the appearance, without requiring to improve the accuracy, such as polishing, sanding, etc;
(6) Ultra precision machining is mainly used for aerospace, laser, electronics, nuclear power and other parts that need special precision, such as mirror turning, mirror grinding, soft abrasive mechanochemical polishing and so on.
