CNC machine tools are mechanical equipment that automatically controls the processing of workpieces according to pre-programmed programs. Common classification methods include processing methods, control system types, structural characteristics, control accuracy and functions, etc. According to the processing method, it can be divided into milling machines, drilling machines, lathes, grinders, etc.; according to the control system type, it can be divided into servo control, spalling control, open and closed loop; according to the structural characteristics, it can be divided into vertical, horizontal, gantry and cantilever types; according to the control accuracy and function, it can be divided into low, medium, high precision and multi-function. These classification methods can select the appropriate machine tool type and configuration according to different needs to meet the requirements of various workpiece processing. The development of CNC machine tools has brought about efficient, high-precision and good repeatability processing solutions, which are widely used in aerospace, automobile, home appliances, communication equipment and other industries, and promoted the development of industrial production.