Research On Dynamic Performance Optimization Of CNC Router Based On Virtual Commissioning

CNC router is a kind of numerical control machine developed by combining numerical control technology and carving technology.It is increasingly popular and widely used in wood and other non-metal processing industries.The machining accuracy requirements of door panel,cabinet door and other furniture put forward higher requirements for the machining performance of CNC router.The processing performance is closely related to the dynamic performance,and the router is prone to error increase and performance decline in the long-term use.In view of the above problems,this thesis proposes a dynamic performance optimization method based on virtual commissioning for Zhongke K500 CNC router with the help of digital twin concept.This method can optimize the servo control parameters in time,replace the inefficient manual commissioning,optimize the mechanical structure parameters,and select and install the mechanical parts in the design stage of router.The contents are as follows:The overall research framework is proposed to explore the collaborative simulation analysis and physical modeling mechanism of SolidWorks and MATLAB,and analyze the main functional parts of router.Considering the coupling effect of mechanical structure and servo control circuit,the influencing factors and evaluation indexes of dynamic performance of router are comprehensively analyzed.The multi domain physical modeling tool Simulink/simscape is used to build the servo system of router.The mechatronics coupling model of feed system mainly includes mechanical,electrical and control fields.The dynamic performance test of router is carried out with the help of laser tracker to verify the reliability of the mechatronics coupling model.This thesis constructs virtual commissioning platform,establishes CAD model of carving machine,adds structural attribute,mechanical constraint and other information.Based on the transformation relationship between SolidWorks and MATLAB,XML file is transformed into SimMechanics dynamic model,and the dynamic model is constrained by adding saturated block to complete the digital twin construction of the whole machine;MATLAB is used GUI establishes virtual commissioning interface which realizes human-computer interaction with the model,and reflects and stores dynamic information in real time.The multi-objective optimization process of dynamic performance is proposed,and the single axis feed system and three-axis linkage feed system of router are optimized respectively.The box Behnken experimental design method is used to obtain the dynamic performance results of sample points and virtual commissioning;based on the Design-Expert software,the second-order response surface model of dynamic performance influencing factors and evaluation indexes is fitted,and the multi-objective genetic optimization NSGA-II algorithm is used to seek the optimal solution.The optimization results show that the maximum overshoots of X,Z single axis feed and three-axis linkage feed are decreased,the positioning accuracy and response efficiency are improved,and the dynamic performance of router is improved significantly.