Thermal Analysis And Structural Optimization Of The Motorized Spindle Based On Fluent

High-speed Spindle is the core component of the High-speed Machine and has great effects on the machining accuracy, stability and the range of application. The spindle is the combination of machine main-spindle and the electric motor. When the spindle is operating in high speed, it does not have good heat radiation due to the relatively sealed structure. Also because that the thermal property is one of the most important factors that affect the accuracy, thermal analysis and research on the High-speed Spindle are necessary.This report is based on the study of the motorized spindle provided by Guangzhou Haozhi Industrial Co., LTD. The heat source, heat conduction mechanism, steady state temperature field of spindle, thermal deformation and thermal stress are analyzed in the report. The accuracy of the spindle steady temperature field can be verified through thermal-fluid-structure coupling analysis using finite element software and experiment. The final step is to optimize the structure using the thermal deformation and stress of the main spindle as the target function.The main research contents of this report are as follow:1. The structural features of the motorized spindle are analyzed, and the thermal power of the main heat source of the motorized spindle is calculated:wear and tear of the electric motor and friction of the ceramic mixture ball-bearing. To calculate the convention heat transfer coefficient of the electric spindle components according to the characteristic of the heat convention. The theoretical model of heating and heat conduction of the motorized spindle is established.2. According to the theoretical model of heating and heat conduction of the motorized spindle, the thermal-fluid-structure finite element model of the motorized spindle is set up. The steady temperature field is analyzed using Fluent. The accuracy of the results is examined through temperature measurement of the key position on the electric spindle.3. After the temperature field analysis of the motorized spindle, the thermal deformation of the spindle is analyzed using Workbench ANSYS. The main spindle structure is optimized base on the positions of the bearing and the motor in the main spindle as the design variable and the thermal deformation and thermal stress as the target function.