Computerized digital control, referred to as Numerical Control. It is a method to control the movement and processing of machine tools by using digital information. Machine tools that use CNC technology to implement process control, or machine tools equipped with CNC systems are called numerically controlled (NC) machine tools. The numerical control system includes: numerical control devices, programmable controllers, spindle drives and feed devices. CNC machine tools are highly integrated products of machine, electricity, fluid, gas, and light. To realize the control of the machine tool, it is necessary to use geometric information to describe the relative movement between the tool and the workpiece and process information to describe some process parameters that the machine tool must have. For example: feed speed, spindle speed, spindle forward and reverse, tool change, coolant switch, etc. The information is formed into a processing file according to a certain format (that is, a normal CNC machining program) and stored on an information carrier (such as a magnetic disk, perforated paper tape, magnetic tape, etc.), and then read by the CNC system on the machine tool (or directly through the CNC system) Keyboard input, or input through communication methods), and decode it to make the machine tool move and process parts. Modern CNC machine tools are typical products of mechatronics, and are the technical foundation of new generation production technology, computer integrated manufacturing system, etc. .