Traditional mechanical processing is performed by manual operation of ordinary machine tools. During processing, the mechanical cutter is shaken by hand to cut metal, and the accuracy of the product is measured by the eye with a caliper and other tools. Modern industry has long used computer digitally controlled machine tools for operations. CNC machine tools can automatically process any product and component directly according to a program prepared by a technician in advance. This is what we call "NC machining". NC machining is widely used in all fields of mechanical machining, it is the development trend of mold machining and important and necessary technical means.