Thermal State Analysis Of High Speed Electric Spindle And Experimental Study Of Cooling System

As an important part of the machine tool,the high-speed electric spindle has a direct impact on the accuracy,efficiency and quality of the workpiece.Compared with traditional mechanical spindles,high-speed electric spindles have obvious advantages in terms of speed,processing quality,processing accuracy,and transmission performance.The electric spindle is a new technology that integrates the spindle motor and the spindle.Because of this integrated technology,the motor and the bearing will generate a lot of heat during the work process.If this heat cannot be radiated,it will cause severe thermal deformation of the electric spindle,which will not only affect the machining accuracy and quality of the workpiece,but also affect the service life of the electric spindle.Therefore,it is of great significance to analyze the heat generation and heat transfer methods of the high-speed electric spindle and analyze and study the cooling system of the high-speed electric spindle.In order to solve the actual production problems of Ningbo Tiankong Five-axis Numerical Control Technology Co.,Ltd.,this paper takes the high-speed electric spindle of the spiral cooling system as the research object,and starts the corresponding research work.First of all,the heat generation and heat transfer methods of the bearing are analyzed based on the theory of electrical mechanics,the principle of frictional heat generation of the bearing,and the principle of heat transfer.Then use ANSYS Workbench software to carry out thermal-fluid-solid coupling simulation analysis to obtain its temperature distribution cloud map and thermal deformation map.Then use ANSYS Workbench software to carry out thermal-fluid-solid coupling simulation analysis to obtain its temperature distribution cloud map and thermal deformation map.Then Based on the above results,the existing deficiencies are further summarized and summarized,in order to provide a theoretical basis for the next optimal design of the cooling system.In order to improve the shortcomings,a new high-speed electric spindle cooling system was optimized and named U-shaped cooling system.Then use ANSYSWorkbench software to carry out thermo-fluid-solid coupling simulation analysis on the U-shaped cooling system to obtain the temperature distribution cloud diagram and thermal deformation map of the high-speed electric spindle of the U-shaped cooling system.In order to better understand the performance of the high-speed electric spindle cooling system of the U-type cooling system,different inlet flows will be analyzed to obtain the influence of different inlet flows on the temperature distribution and thermal deformation of the high-speed electric spindle of the U-type cooling system.In order to verify the accuracy of the above simulation analysis results,an experimental platform will be established.Experiments are performed on the two high-speed electric spindles of the above two different cooling systems,and the U-type cooling system is tested under different flows.By studying the influence of different flow rates on the performance of the U-shaped cooling system,the accuracy of the simulation analysis results are compared and verified,and the reasons for the errors are further analyzed.