| As it is of great importance to the machining efficiency and precision of NC machine tools, the study concerning the modeling, optimization and test technique of the structural dynamic characteristic takes an academic value as well as engineering significance. Aiming at the problems about the dynamic characteristic of a certain 5-axis machining center, this paper focuses on the parameter identification of a slide ways contact surface, Ansys modeling and simulation of the machining center and its key component, modal analysis based on experiments together with the structural modification to the weakness. The details of this paper are as follows:1) Based on the table of a vertical machining center, the experiment platform of parameter identification is set up. After plenty of experiments, the law of the equivalent parameters of the guide ways contact surface is obtained when the press, lubrication and the preload of inlaid strips change respectively.2) The finite element model of the 5-axis linkage machining center is built and its modal vibration and parameter are obtained through simulation. Meantime, the law of the upright post and AB axis deformation is acquired.3) By means of LMS Test.Lab, experimental modal analysis, anti-vibration cutting experiment together with motion characteristic analysis of the upright post are conducted to the machining center and the weakness of the structure is found.4) Several structural modification solutions to the weakness of the machining center have been proposed and validated through finite element analysis.The modification proposals have been used by the cooperative enterprise. The work of this paper is part of the subject"5-axis machining center to the machining of the titanium alloy aviation structural products"which belongs to the state project"Major Projects for Science and Technology Development". It lays the foundation of the theoretical and experimental basis for the dynamic characteristic of the machining center. |
PDF Full Text Request