Research On Thermalcharacteristics Analysis And Prediction Of Five-axis High Speed Machining Center

With the gradual advancement of China's "Made in China 2025" strategic goal,five-axis CNC machine tools have become more and more widely used as high-end manufacturing equipment in ships,aerospace and other fields,and their processing precision has become more and more important.The five-axis CNC machine tool has many moving parts,high spindle rotation speed and fast feed speed,which leads to complex heating mechanism.The thermal deformation error caused by heat has a serious impact on the machining accuracy of the machine tool.This paper takes the VMC-0656 e five-axis linkage machining center produced by Shenyang Machine Tool Co.,Ltd.as the research object,and uses the finite element method to analyze the thermal field of the no-load and loading states and the thermal deformation of the main components.The main thermal error of the machine tool is decomposed.The thermal performance experiments of each part were carried out.The temperature and thermal error data were collected and compared with the simulated analysis data.According to the experimental data samples,the main thermal errors in the loaded state were modeled,and the parts and the whole were The thermal error prediction effect of the machine was analyzed.The main research contents of this paper are as follows:(1)The heat source and boundary conditions of the VMC-0656 e five-axis machining center are analyzed,and the heat generation rate and convection heat dissipation coefficient of each heat source under no-load and loading state are calculated using relevant empirical formulas.The finite element method was used to analyze the thermal deformation of the temperature field and the main components,and the main thermal error distribution of each part of the five-axis machining center was obtained.(2)According to the structural characteristics of the experimental analysis object,the main thermal error experiment and modeling research of the five-axis machining center were carried out with reference to the relevant theory and finite element analysis results.The mathematical model of the main thermal error was established,and the decomposition method was used for no-load.With the loading experiment,the main thermal error and thermal field temperature of the machine tool were measured.(3)The loading experiment analyzes the results of the no-load experiment and simplifies the change of the thermal error.According to the actual processing characteristics of the machine tool,the actual cutting and static loading experiments areformulated.The simulation analysis and experimental analysis structure are compared,and the analysis results of the simulation analysis are verified.(4)The whole machine thermal error prediction method of the five-axis machining center was studied.The temperature measurement points were selected and the thermal error model was established for each part of the machine tool.Based on the characteristics of the thermal error experimental data,the time-based change was established.Thermal error model.The comparative analysis of the prediction effects of the thermal error of each part and the total thermal error of the machine tool direction is analyzed for the three models.