The CNC control system is an important component of high-speed machining centers, which largely determines the speed, accuracy, and surface quality of machine tool processing. Therefore, for high-speed machine tools that process free-form surfaces of molds, the performance of CNC systems is of special significance.

When machining high-precision free-form surfaces, the tool path composed of micro segment lines and arcs creates a huge part program, and these data streams need to be stored and processed by the machine tool control system. Therefore, the length of program segment processing time is an important indicator that determines the efficiency of CNC control systems. At present, the processing time of program segments in high-end CNC control systems can generally reach 0.5ms (such as Heidelberg's iTNC530 CNC system), while the processing time of program segments in some CNC systems has been shortened to 0.2-0.4ms.

The modern CNC system applied to high-speed machining of molds should not only have the necessary short program processing time to ensure high-speed feed rate, but also have Nurbs and spline interpolation functions, and be able to work at a nanometer resolution to achieve high machining accuracy and surface quality in high-speed machining.

At present, high-end CNC systems can also be connected to CAD/CAM systems from different manufacturers, and data is transmitted from the CAD/CAM system to the control system at a high speed through Ethernet. The integration of CAD/CAM into control systems can greatly achieve good results in the processing of complex mold contours, and make a significant contribution to shortening adjustment and programming time.