Numerical control machine tools is the abbreviation of Computer numerical control machine tools, is a kind of automatic machine tools equipped with program control system. The control system can logically process the program with control code or other symbolic instructions, and decode it, represent it with coded numbers, and input it into numerical control device through information carrier. After processing by the numerical control device issued a variety of control signals, control the movement of machine tools, according to the shape and size requirements of the drawings, automatically processing parts out.