Machining processes mainly include turning, milling, grinding, pliers, drilling, boring, planing, punching, sawing, electroplating, heat treatment, wire cutting, forging, etc. ① Turning: Lathe, which is mainly used for straight line or curve translation processing of rotating workpieces through turning tools. Turning can make the workpieces reach the proper shape, and is suitable for processing shafts and rotary parts; ② Milling: milling machine, which mainly processes workpieces fixed on the worktable through rotating cutters, and is suitable for machining planes, grooves, various curved surfaces or gears; ③ Grinding: the grinding machine mainly grinds the surface, excircle, inner hole and tools of the workpiece through the high-speed rotating grinding wheel, and the surface roughness of the machined workpiece is particularly high; ④ Pliers: the bench for bench workers, which is used for precise measurement, checking the dimensional accuracy and form and position error of parts, and making precise scribing. It is the basic tool and operation in mechanical manufacturing; ⑤ Drilling: drilling the workpiece with a drill and other tools; ⑥ Boring: The boring cutter or blade is used to process the hole, which is applicable to the hole of workpiece with high precision and large diameter; ⑦ Plane: plane or curved surface is processed by plane cutter, which is suitable for processing straight surface of the workpiece profile, but the roughness of the processed surface is not as high as that of the milling machine; ⑧ Punch: Punch, which is formed by punching, such as punching round or hole; ⑨ Saw: sawing machine, suitable for cutting after blanking. Through the above methods, the overall dimensions of the workpiece can meet the requirements of the design drawings. The advantages of pure machining are high precision, high production efficiency of general parts, good consistency and guaranteed quality control; The disadvantage is that it is difficult to manufacture parts with complex cavities and thin-walled parts, and some parts with complex cavities cannot be manufactured as a whole. It is difficult to assemble and weld parts after disassembly and manufacturing. It is difficult to ensure the tightness of parts, especially the strength stability and consistency (the subsequent friction stir welding can only solve some welding problems); In the face of complex special parts, the pure machining process with high requirements cannot be realized.