Dynamic Analysis, Test And Optimization Of E - 305S Vertical Woodworking Milling Machine

With the development of domestic and foreign machines to high-speed, high-precision, excellent dynamic characteristics of woodworking machines are required. This paper regards E-305S vertical woodworking milling machine as the object, combined the simulation analysis with experimental research method, finite element analysis, experimental research and structure optimization are carried out, and it mainly includes the following aspects:Firstly, the three-dimensional model of milling machine is established. According to the joint surface characteristics between different parts, finite element model is established using Hypermesh and ANSYS based on the equivalent joint surface method of spring-damper unit. The modal analysis of rigid coupling and flexible coupling models are completed. Using hammering method, the modal test is completed and the inherent frequency and vibration modes are recognized. Compared to the finite element analysis results, flexible modeling analysis error is between 0.14%-13.61% and rigid modeling analysis error is larger, it illustrates that the flexible modeling analysis is more accurate.Secondly, This paper recognizes ODS (Operating Deflection Shapes) frequency and working modes of milling machine at different speeds and conditions based on ODS test. Compared with finite element analysis results, there are three fixed frequency ranges, which are 35-50Hz,100y110Hz and 130-147.5Hz. According to the modal modes and ODS working modes, the weak links of milling machine are pointed out.The milling test of milling machine under different conditions is conducted and vibration parameters under different working conditions are analyzed by the time domain analysis and frequency domain analysis. Compared with finite element analysis and ODS test results, the vibration amplitude is bigger near 86.3Hz,147.5Hz,177.2Hz and the natural vibration and forced vibration of milling machine under actual working state are researched.Finally, the weak links of milling machine is optimized and the third program is opted after comparison of analysis results of three optimized design programs. The joint surface modeling and finite element simulation analysis of optimized machine are completed. After optimization, the total mass is only increased by 0.7% and the inherent frequency is improved by 2.3%～13.9%, dynamic characteristics of milling machine is improved effectively.