Abstract: Aiming at the problem that the actual operating status of CNC machine tools is not directly reflected by traditional monitoring technology and virtual simulation technology, a virtual-real interactive monitoring system for CNC machine tools based on digital twins technology is designed by combining the new generation of information technology and the concept of digital twins. In addition, taking a CNC machine tool as example, the system architecture and related functions are first designed through Portal software. Based on that, the information collected by the sensor is transmitted to the system through PLC and Ethernet for analog conversion; and the digital twins data in the system is connected with the digital twins to realize the reception and transmission of information, then the combination of virtual and real are completed through OPC-DA. Finally, this method is used to monitor the vibration signal of the machine tool in real time and design a remote control panel. The experimental results show that the system using the virtual-real interactive monitoring system and digital twins of the CNC machine tool to double monitor the machining process can reflect the actual operating status of the machine tool more effectively and intuitively. Meanwhile the digital twins is virtually controlled by the virtual-real interactive monitoring system, and the application field of digital twins technology is further expanded.

Key words: digital twins, virtual reality interaction, CNC machine tool, monitoring system