Dynamic Performance Analysis Of High-speed And High-power Electric Spindle Considering The Characteristics Of The Joint Surface

With the rapid development of high-speed machining technology,the electric spindle system is gradually developing in the direction of high-speed,automation,and environmental protection.A high-speed and high-power electric spindle is the core component of high-speed processing machine tools.The dynamic performance directly determines the processing quality of the product.The characteristics of the joint surface of the electric spindle and the heat generated during the milling process have a greater impact on its dynamic performance,thereby affecting the processing quality.Therefore,it is necessary to conduct in-depth analysis and research on the dynamic performance of high-speed and high-power electric spindles.Based on the latest research results at home and abroad,with the support of the National Natural Science Foundation of China,this paper establishes a high-speed electric spindle system milling model to study the rigidity of the spindle-tool holder-tool joint surface and the effect of the depth of cut,the width of cut,and speed on the electric spindle system.The influence of static and dynamic characteristics,milling dynamic characteristics and milling thermo-mechanical coupling dynamic characteristics.The research content can be summarized as:Chapter 1,Introduction.Summarizes the project source,research background,and research significance of this article;systematically introduces the development process,research status,and latest results of the high-speed electric spindle system at home and abroad.Chapter 2,Analysis of the static and dynamic characteristics of the electric spindle.The basic structural characteristics and working principles of the electric spindle system are briefly described.The geometric model and finite element model of the electric spindle rotor system are established according to the design size parameters,and the static stiffness characteristic analysis,modal analysis,and harmonious response analysis are carried out.Chapter 3,Analysis of dynamic characteristics of electric spindle milling.Determine the separation criterion of the milling dynamics model and the constitutive model of the workpiece,calculate the stiffness of the spindle-tool holder-tool interface;establish the finite element dynamics model of the electric spindle rotor system,and study the stiffness of the spindle-tool holder-tool interface The influence of depth of cut,the width of cut and speed on electric spindle’s milling force and vibration dynamics characteristics of tool tippoint.Chapter 4,analysis of dynamic characteristics of thermo-mechanical coupling for electric spindle milling.According to the theory of heat transfer,the heat generated by the internal and external heat sources of the electric spindle during the milling process,and the heat dissipation law of different positions are analyzed.;the heat flux density and convection heat dissipation coefficient inside the electric spindle is calculated;The thermal-mechanical coupling finite element model of electric spindle milling is established.The temperature field distribution of the rotor system of the electric spindle is solved,and the influence of the stiffness,the depth of cut,the width of cut,and the speed of the spindle-tool holder-tool joint surface on the milling force and tooltip vibration is studied,and the thermal-mechanical coupling is not considered.Comparing the calculated results,the effect of thermo-mechanical coupling on the milling force of the electric spindle and the vibration dynamics characteristics of the tooltip is obtained.Chapter 5,experimental verification.The experimental device and testing method of the milling dynamic characteristics of the high-speed and high-power electric spindle are introduced;the experimental scheme is designed by the orthogonal experiment method.The calculation results of the model are verified by the experimental data of electric spindle milling.Chapter 6,conclusions and prospects.Summarize the conclusions of the full-text research,and look forward to the deficiencies of this article and the subsequent research work that needs to be carried out.In this paper,for the electric spindle rotor system composed of bearing-spindle-tool holder-tool,the stiffness,the depth of cut,the width of cut,and the speed of the spindle-tool holder-tool interface are used as parameters to carry out static and dynamic characteristics,milling dynamics characteristics,and milling.The thermal-mechanical coupling dynamic characteristics analysis and research provide a reference for the design and optimization of the electric spindle,which has good academic significance and practical benefits.