| CNC machine tool is the core equipment for machining automation,and its spindle system is an important part of CNC machine tool.The spindle drive of CNC machine tool is far different from the general industrial drive.In order to meet the design requirements of high spindle speed,high positioning accuracy,high processing quality,high production efficiency,continuous high torque output of CNC machine tool and the realization of stepless speed regulation,The spindle drive of CNC machine tool of planetary gear train as the transmission system was studied.The dynamic part of the spindle driving device of the CNC machine tool was AC servo motor,and the planetary gear train was used for the deceleration mechanism.Firstly,the working principle of the spindle drive of CNC machine tool was analyzed,and the drive device and transmission system were designed and checked by using known data.In the planetary gear train system,a tooth gap clearance structure was designed to reduce the vibration problem caused by the backlash and improve the machining accuracy of the machine tool.Secondly,the 3D modeling of the spindle driving device of CNC machine tool was carried out through Solid works software.Matlab software was used to optimize multi-objective design of the main planetary gear reducer.The gear parameters and performance were optimized to some extent.The material and cost were saved,and the bearing capacity and transmission stability of the gear were improved.Then,In view of the vibration damage that may occur during the operation of the CNC machine tool spindle drive,the modal analysis of the drive system was performed by using ANSYS Workbench software.The natural frequencies and mode shapes of the planetary gear train were obtained,which laid the foundation for the subsequent dynamic analysis.At the same time,the static analysis of the planetary gear train was carried out with the software.The stress and total deformation of the main components under given operating conditions were obtained.By comparing the stress and the allowable stress of the material,it was known that the planetary gear train meets the strength requirements.According to the results of finite element analysis of planetary gear train,the structure of the planet carrier was optimized.Finally,the virtual prototype model of the planetary gear train was established by using ADAMS software.The kinematic and dynamic analysis of the reducer was carried out.The results of the simulation were compared with the theoretical values,and the results were more accurate.At the same time,the average load characteristic curves obtained show that the planetary gear train system runs stably and the virtual prototype model was set up correctly.The high degree of reliability indicates that the load bearing characteristics of the spindle driving device of the CNC machine tool were better.Through the design,checke and simulation analysis of the spindle drive device of the numerical control machine tool with the planetary gear train as the transmission system,a complete set of research methods has been formed.This method improves the accuracy of the spindle positioning and the stability and reliability of the drive system.Realizing high torque and high transmission efficiency of equipment has certain reference value. |
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