Research On Thermal-Mechanical Coupling Analysis And Optimum Design Of Large CNC Machine Tool Workbench

With the rapid development of aerospace industry and ocean engineering,the processing requirements for large parts are getting higher and higher.As one of the important equipment in manufacturing industry,the accuracy of the Large CNC machine tool affects the accuracy of the whole parts processing.As an important part of the CNC machine tool,the static and dynamic characteristics of the machine tool workbench have a great impact on the overall performance of machine tool.Especially for the rotary workbench,with the increase of rotational speed,the heating of the workbench will gradually increase.In this case,the influence of the thermal coupling effect on the performance of the workbench cannot be ignored.Accordingly,it is of great significance to study the thermo-mechanical coupling analysis and optimization design of machine tool workbench.In this paper,the QLM23 gantry mobile CNC boring and milling machine workbench is taken as the research object.Firstly,the three-dimensional CAD modeling of the workbench was carried out by means of Creo2.0 software.The model was imported into ANSYS Workbench for finite element analysis.The static and dynamic performance of the workbench was studied by static analysis and modal analysis.The results of thermo-mechanical coupling analysis and comparison with those before thermo-mechanical coupling showed that the thermo-mechanical coupling effect had obvious influence on the maximum displacement deformation and equivalent stress of the workbench.Then,based on the results of finite element analysis,the bionic design was used to model the machine tool workbench.The finite element analysis of the bionic workbench and comparison with the original model verified that the performance of all aspects of the bionic workbench had been significantly improved.Finally,using the optimization design module in ANSYS Workbench,the multi-objective optimization design based on response surface analysis was applied to the bionic workbench,and the specific parameters of the bionic workbench were determined.Comparing the optimized bionic workbench with the optimized one,the optimized model was verified.The maximum displacement deformation decreased while the mass decreased,which provided a high structural strength of the workbench and achieved the goal of lightweight workbench.Thus,the optimal design of the workbench was completed.Through the analysis of the machine tool workbench,the static and dynamic performance of the workbench was understood.The influence of thermo-mechanical coupling on the workbench was studied.The optimum design of the QLM23 gantry mobile CNC boring and milling machine workbench was completed.The bionic model of the workbench was obtained,which improved the static and dynamic performance of the machine tool workbench.It provides a reference for the design of other workbenches.