CNC (Numerical Control Machine Tool) is the abbreviation of Computer Number Control, which is an automated machine tool equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, and decode them to make the machine move and process parts. The control unit of a CNC machine tool is the brain of the CNC machine tool, and the operation and monitoring of the CNC machine tool are all completed in this CNC unit.

Compared with ordinary machine tools, CNC machine tools have the following characteristics: high machining accuracy and stable machining quality; Capable of multi coordinate linkage and processing complex shaped parts; When changing the processing parts, generally only the CNC program needs to be changed, which can save production preparation time; The machine tool itself has high accuracy and rigidity, and can choose favorable processing quantities, resulting in high productivity (usually 3-5 times that of ordinary machine tools); The high degree of automation of machine tools can reduce labor intensity. The quality requirements for operators are higher, and the technical requirements for maintenance personnel are higher.