Because of the special machining process characteristics of the piston, it is difficult to meet the high precision requirements of the piston by the general machine tools alone. Therefore, machine tool manufacturers must intensify technical renovation efforts to provide suitable piston movement for men and women in the piston performance requirements of numerical control, clean, flexible manufacturing technology and equipment. The piston is the heart of the automobile engine. It bears the alternating mechanical load and the motion picture load of the hot male and female pistons. It is one of the key parts in the engine under the worst working conditions.