Finite Element Analysis And Lightweight On Structure Of CX8075 High-Speed Machining Center

High-speed machining (HSM) that possesses outstanding advantages of high efficiency and high precision is one of the most important advanced manufacturing technologies and has wide application prospects. High speed and high precision machine tool is the foundation to realize high speed cutting. In the structural design of high speed machine tool, modern design method supported by finite element method (FEM) and modal analysis theory has become an inevitable trend in the development of machine design.Since the high-speed milling machine CX8075 discussed here has a high cutting speed and big cutting output, a reasonable machine structure wih better dynamic and static performance should be guaranteed. Furthermore, since this machine is a single-piece production, its performance should meet the hereinbefore requirement in the initial design stage. In this paper, the finite element model of the high-speed vertical milling and turning center is established based on the FEM theory. With structural improvements on the basis of FEM analysis, both the part and overall unit can provide better static and dynamic performance. The application of these new methods not only improves the working capability and machining precision of the new machine tool, but also reduces the development costs and development cycle of the new production. The main researches in this paper are organized as follows:After establishing the finite element model of vertical milling and machining center, dynamic and static analysis of all the major structural parts is given using the finite element analysis software. Stress distribution of machine is analyzed and weak part of machine can be obtained. These provide theoretical basis for optimizing the structure. On the basis of modal analysis and harmonic response analysis, the weak links of lathe bed can be found out. Then change the internal structure of bed in order to improve the ant-vibration performance of lathe bed. Finally, optimal scheme of lathe bed structure is presented.The dynamic performance of the machining center has been analyzed on the basis of finite element analysis. Then the frequency range which should be avoided when the machining center works normally.The lightweight design of the machine moving parts is presented. According to the lightweight design of the main moving parts, such as bed saddle and rotary worktable, the moving speed and acceleration of machine can increase greatly without any increase in fast moving force. Therefore, the rapid response capability of machine is improved.