Dynamic Characteristic Analysis Of High-Speed Precision Press

With the development of high-speed precision press, its vibration is becoming one of the important questions to resolve. On this problem, the following aspects have been studied in this thesis.Firstly, the multi-body dynamics model of the crank and slider mechanism was built up. The kinetic and dynamic simulation analysis was studied using Pro/MECHANICA Motion. The inertia force was balanced by air spring, which could enhance the stability of the slider. These made basis for the static analysis of the combined frame.Secondly, the finite element models of the airframe, base and workbench, which were the main parts of the press, were built up. And based on the modal analysis theory and FEM technology, the free modal analysis of the main parts was studied. The equivalent dynamic characteristics parameters of bolt joints were researched, and the finite element model of the combined frame was built up using the linear spring-damper elements. Then the free modal analysis and the constrained modal analysis were studied.Thirdly, the modal parameters of the press were identified according to the results of the modal test. These were compared with the results of the finite element modal analysis, and the correctness of the finite element model of the combined frame was confirmed.Lastly, based on the results of affection analysis after changing the part parameters, the better project was suggested. The static analysis of the modified combined frame was studied, and the analysis results also met the need of the intensity and stiffness.