Multi-domain Modeling And Virtual Debugging Of CNC Machine Tool Based On Digital Twin

With the concept of "Industry 4.0" proposed,the manufacturing model is changing to intelligence.As the parent machine of the manufacturing industry,the machine tool is an important factor affecting the development of the manufacturing industry.More efficient,reliable,and intelligent have become the main direction of machine tool development at this stage.Due to the complexity of the structure and function of the machine tool,the development cycle of the machine tool is long,the risk of the actual machine commissioning is high,and the cost is high,which affects the rapid response of the market and the control of the production preparation cycle.In this context,this paper proposed a virtual debugging solution based on the multi-domain physical model of the machine tool.Based on the concept of Digital Twin,taking the three-axis vertical CNC milling machine as the research object,establishing its multi-domain digital model,designing its virtual debugging platform,and performing virtual debugging on the CNC machine tool model from two aspects of servo system parameter setting and virtual machining.This verifies the validity of the performance and function of the multi-domain model of CNC machine tools.By analyzing the electromechanical coupling characteristics of a machine tool,it can be seen that inter-domain coupling is a key issue in constructing a multi-domain model of a machine tool.In order to solve the multi-domain unified modeling problem of CNC machine tools,this paper comprehensively analyzed the existing multi-domain modeling methods and built a multi-domain digital model of CNC machine tools based on the MWorks platform using the multi-domain unified modeling language Modelica,which explained the construction method and implementation process of multi-domain model.of CNC machine tool based on Modelica language.The model mainly involves the three fields of mechanics,electrics,and control,and can be divided into the machine body model and the virtual machining environment model.The machine body model includes models of the key functional components of the electric,control,and mechanical subsystems.The virtual machining environment model includes the workpiece blank model,the model of the workpiece processing stage,and the material removal model when the workpiece is processed.During modeling the virtual processing environment,the equivalent model method of discrete vector intersection method was proposed as a method to establish the workpiece model.Based on this workpiece model,the virtual processing environment model of the machine tool was established to simulate the workpiece material removal process of the machine tool.The virtual debugging scheme of the machine tool method was discussed,and the virtual debugging platform of the machine tool was designed.Based on the soft PLC platform CoDeSys,the upper test system was developed,and the communication mechanism between the upper test system and the model was established.Theinformation exchange between the upper test system and the model was realized.Through the PI servo tuning example and virtual machining experiment,the performance and function of the machine tool model were tested,and the validity of the model constructed in this paper was proved.The virtual debugging function of the model can reduce the risk of machine debugging,shorten the development cycle and production preparation cycle of the machine tool,and provide an effective solution for the rapid design and rapid processing preparation of the machine tool.