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CNC machining (numerical control machining), refers to a process method for machining parts on CNC machine tools. The process protocols for CNC machine tool machining and traditional machine tool machining are consistent in general, but have also undergone significant changes. The machining method of controlling the displacement of parts and tools with digital information. It is an effective way to solve the problems of variable variety of parts, small batches, complex shapes, high precision and to achieve efficient and automated processing.
 

CNC technology originated from the needs of the aviation industry and was proposed by an American helicopter company in the late 1940s.
 

The initial idea of CNC machine tools, in 1952 the United States Massachusetts Institute of Technology developed a three-coordinate CNC milling machine. 50s in the middle of this CNC milling machine has been used for processing aircraft parts. 60s, CNC systems and programming work increasingly mature and perfect, CNC machine tools have been used in various industrial sectors, but the aerospace industry is always the largest user of CNC machine tools. Some large aviation factories with hundreds of CNC machine tools, which are mainly cutting machines. CNC machining of parts are aircraft and rockets of the whole wall plate, beam, skin, spacer, propeller, as well as the aero-engine magazine, shaft, disk, blade mold cavity and liquid rocket engine combustion chamber of the special cavity surface. The initial stage of the development of CNC machine tools are mainly continuous trajectory CNC machine tools, continuous trajectory control.

Continuous trajectory control, also known as contour control, requires the tool to move relative to the part according to the prescribed trajectory. Later and vigorously develop point control CNC machine tools. Point control refers to the tool from a point to another point of movement, as long as the last can accurately reach the target regardless of the route of movement.