Multi-axis coupling of machining centers based on electromechanical modeling
ZHAO Tong, XIE Yi, HU Jian
Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Abstract:The dynamic accuracy of a machining center is strongly influenced by its structural dynamics and control loops. The frequency response of the entire machine including the multi-directional dynamics is important in the machine tool design phase. The structural dynamics of a twin ball screw feed machine are analyzed using a finite element analysis (FEA) and measurements with a focus on the multi-axis coupling of its mechanical system. Then, an electromechanical modeling method is developed where the structural dynamics are replaced by transfer functions to study the multi-axis coupling of the electromechanical system of a horizontal machining center. The results show that when there are modal shapes leading to displacements of the tool or the workpiece in multiple directions, the multi-axis coupling of the machining center must be considered in studies of the dynamics and control parameters.
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