Brief introduction to the classification of numerical control system

Cheng; Classification; Overview of development trend 1 In the 1940s, with the development of social productive forces and the continuous progress of science and technology, people had higher requirements for the production efficiency and quality of various products. Automatic machining is one of the important ways to realize the above requirements in mechanical machining. 1948 The Institute of Massachusetts Institute of Technology cooperated with Parsons Company to propose a three-coordinate vertical milling machine. It is precisely because of the appearance of this computer-controlled CNC milling machine that CNC technology has developed rapidly all over the world. The technology of controlling the actions and machining process of multiple or one mechanical equipment through digital information composed of symbols, characters and numbers is called numerical control technology, which is abbreviated as numerical control. Because of the development of computer, most modern numerical control is controlled by computer, so numerical control technology is also called computer numerical control (CNC). NC machine tool is a machine tool controlled by numerical control technology. It is the product of the combination of many disciplines. It adopts advanced technologies such as automatic control technology, computer technology, precision measurement technology, software technology, servo drive technology and sensor technology, and is a typical mechatronics product. 2 The composition control system of CNC system mainly includes input medium, control medium, servo system, CNC device, measurement feedback device, actuator and so on. 2. 1 control medium The so-called control medium is the control medium of CNC machinery at work, which does not need manual processing, but the mechanical equipment must also work according to the operator's intention, which requires us to establish a certain relationship between the operator and the mechanical equipment, which is what we call control medium (information carrier).