The initial idea of CNC machine tools, the Massachusetts Institute of Technology developed a three-axis CNC milling machine in 1952. This kind of CNC milling machine has been used for processing aircraft parts in the mid-1950s. In the 1960s, numerical control systems and programming work became increasingly mature and perfect. CNC machine tools have been used in various industrial sectors, but the aerospace industry has always been the largest user of CNC machine tools. Some large aviation factories are equipped with hundreds of CNC machine tools, of which cutting machines are the main ones. CNC machining parts include integral wall panels, beams, skins, bulkheads, propellers, and aircraft engine casings, shafts, disks, blades, and special cavity surfaces of liquid rocket engine combustion chambers. . The initial stage of the development of CNC machine tools is based on continuous trajectory CNC machine tools, continuous trajectory control.
Continuous trajectory control is also called contour control, which requires the tool to move on a prescribed trajectory relative to the part. Later, we will vigorously develop point-control CNC machine tools. Point control means that the tool moves from one point to another, as long as it can reach the target accurately at the end, regardless of the moving route.
