| The appropriate mass distribution of structural components and moving components has great influences on the dynamic performance of machine tool. Therefore, the appropriate mass distribution of machine tool's structural components has great significance on improving design quality and efficiency at the design stage, especially at the early design stage. Aiming at these problems above, the mass matching design method of structural components for precession horizontal machining center is proposed. This method can be applied to distribute mass of structural components at the conceptual design stage of machine tool, and it also can be used to improve the performances of machine tool in structure improvement design stage. In this paper, the main work and conclusion are as follows:First, based on lumped parameter method, response surface method and multi-objective optimization algorithm, the mass matching design method is proposed. Result of examples shows that this method can improve the dynamic performance of machine tool effectively, while reducing whole machine tool mass.Next, the 3D parametric dynamic model of the horizontal machining center with a box-in-box architecture is established by lumped parameter method. This model is verified by finite element method and experiment and can be used to the proposed mass matching method.Once again, the mathematical model of the relationship between mass distribution of structural components and dynamic characteristics of machine tool is established by BBD and response surface method. This model reveals the influence of mass change of structural components on the dynamic performance of machine tool quantificationally.Finally, taking into account the need of precision hole machining, the selection principle from Pareto solution set is as follows: the first natural frequency of machine tool as high as possible, dynamic stiffness of X and Y directions tend to be equal under the premise of three directions dynamic stiffness as high as possible. |
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