Structural Design Optimization Of Water-cooled High-speed Motorized Spindle On Drilling And Milling Machining Center

With the continuous development of high-speed machining technology,the electric spindle is the core component of CNC machine tools and machining centers,which plays a vital role in the performance and quality of the overall machine tool.For the water-cooled drilling and milling electric spindle,it has the characteristics of high speed,high power and low torque.The method of using the machine coolant to perform water cooling cycle can effectively reduce the temperature of the electric spindle and make the structure of the electric spindle more compact.The paper uses Ansys analysis technology to compare and design several key components in the water-cooled high-speed electric spindle project of the drilling and milling center,including the structural design and dynamic balance calculation of the rotating shaft,the analysis and comparison of the electromagnetic part,and the comparison and optimization of the rotating sealing structure.The main structural parameters of the electric spindle were optimized by computer soft-soildworks,workbench and maxwell,and compared with the traditional calculation results.The research content of the thesis is:(1)Main structural calculation of the prototype structure of the electric spindleThrough the calculation and back calculation of the main structural dimensions and main parameters of the stator and rotor of the electric spindle,the optimal solution within the allowable error is obtained.The main structural dimensions that meet the design requirements of the electric spindle are finally obtained.(2)Electromagnetic performance calculation and Ansys Maxwell simulation analysisThrough the calculation of electromagnetic properties,Ansys Maxwell was used for simulation analysis and comparison.The analysis results show that the synchronous speed,rated torque and efficiency under the rated working conditions basically meet the design requirements.(3)Design of the internal spring broach device of the rotating shaftAccording to the machining shank size and broach force requirements of the machining center,the paper designed a reasonable broach structure.By calculating the number of different butterfly springs and the combination of the combinations,the optimal solution under the required broach force is obtained.(4)Design calculation and finite element analysis of the shaft componentsThe shaft part of the high-speed electric spindle is one of the core components of the electric spindle.In this paper,the wall thickness structure of hollow shaft is studied.At the same time,the rotation characteristics of high-speed shaft,including natural frequency,dynamic balance and disturbance metric under electric spindle load are analyzed and calculated.Static analysis and modal analysis were performed using Ansys Workbench..(5)Optimum design of rotary seal structure of electric spindleDue to the splashing of cutting fluid,environmental dust and other media entering the electric spindle through the rotating gap duug the machining process,the rotation performance and life of the bearing and the motor are affected.Therefore,the selection and design of a reasonable rotary sealing structure is essential for the electric spindle.Through the analysis of different rotary seal forms,the paper redesigned the rotary seal structure required for the electric spindle to achieve a more reasonable sealing structure.