This paper presents a method to investigate the characteristics of a high-speed motorized spindle system. Thegeometric quality of high-precision parts is highly dependent on the dynamic performance of the entire machining system,which is determined by the interrelated dynamics of machine tool mechanical structure and cutting process. Thisperformance is of great importance in advanced, high-precision manufacturing processes. The state-of-the-art in machinetool main spindle units is focus on motorized spindle units for high-speed and high performance cutting. This paper takingthe high-speed milling motorized spindle of CX8075 produced by Anyang Xinsheng Machine Tool Co. Ltd. as anexample, a finite element model of the high-speed motorized spindle is derived and presented. The model takes intoaccount bearing support contact interface, which is established by spring-damper element COMBIN 14. Furthermore, thestatic analysis, modal analysis, harmonic response analysis and thermal analysis were done by means of ANSYScommercial software. The results show that the maximum rotating speed of the motorized spindle is far smaller than thenatural resonance region speed, and the static stiffness of the spindle can meet the requirements of design. The static anddynamic characteristics of the motorized spindle accord with the requirements of high-speed machining. The thermaldeformation of spindle is 6.56μm, it is too small to affect the precision of the spindle. The results illustrate the rationalityof the spindle structural design.
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