Abstract：Under the circumstance of intelligent manufacturing, CNC technology is developing towards more intelligent. The appearance of digital twin provides a new idea for the intellectualization of traditional NC machining. It is still lack of in-depth research that using digital twin to enhance the intelligence of NC machining. This paper discusses in detail the enhancement of digital twin technology in the intellectualization of NC machining from four aspects of perception, understanding, reasoning and service, and compares it with the traditional machining process. Through the introduction of independently developed digital twin system GrapeSim, the realization method of intelligent NC machining technology is described in detail. This system has been verified in COMAC, and a large number of tests have been carried out for actual machining parts, showing the improvement of machining intelligence and the practicability of digital twin system.
2020, 
