In recent years, with the rapid progress of China's mechanical manufacturing engineering, the application of CNC machining in the field of mechanical manufacturing is more and more, but there are still many shortcomings, which need to be improved urgently. With the continuous development of machinery manufacturing, it is necessary to strengthen the application of numerical control technology and improve the level of machinery manufacturing industry. CNC technology is based on the process requirements and design requirements, through the computer to control and process the digital information of the product processing process, so as to improve the production efficiency, enhance the production automation, and improve the comprehensive benefits of enterprises. This kind of numerical control technology uses the control program stored in advance by computer to control the equipment. CNC technology is a typical high-tech, which integrates electronics, machinery, automatic control, detection technology and computer. Automatic flexible system is the core of numerical control technology, the basis of automatic manufacturing process, and an important part of modern integrated manufacturing system. In the field of numerical control technology, the reliability, function, efficiency and product quality of mechanical equipment have been improved to a new level, which makes the traditional manufacturing industry have undergone earth shaking changes. Modern digital control system, referred to as modern numerical control technology, mainly relies on the storage function to control all kinds of machine tools. The main functions of digital control system are: corresponding control program, computer digital control device, input device, output device, speed control unit, spindle control unit and variable control unit. This kind of system is called CNC system. This CNC system can automatically read the digital value given by the input device, and automatically decode to ensure the normal operation of the CNC machine tool, so that it can process qualified parts. The main core of the system is the device, which is a kind of computer. However, the special computer in the device system has the basic structure and functions of ordinary computer, and also includes some functions and special interface units associated with the functions of relevant digital control machine tools. This kind of device mainly includes two parts: hardware and software, mainly through the use of hardware to support the process of software operation. CNC Technology The working principle of CNC technology is to collect the input equipment, input the relevant data needed by the machine tool, and then carry out the coding translation. Through computer operation, the data command is reasonably distributed to the corresponding drive circuit device. Through the corresponding amplification and conversion work, the servo motor is driven, and the related coordinate axis is driven to move, so that each coordinate axis can be accurate Move to the specified location. Continuous cutting of CNC machine tools not only requires accurate positioning, but also requires effective control of the cutting tool. It is necessary to control the cutting path and speed of the cutting tool according to the given speed of the workpiece, so as to ensure the accuracy of each place in the cutting process. In this process, the interpolation function of the CNC device plays a decisive role.