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提出了以机床结构件质量作为设计变量,以整机动态性能最高作为设计目标,综合运用试验设计、响应面拟合及多目标遗传算法,实现支撑结构件优化匹配设计的方法。以某卧式加工中心立柱组件为例,验证所提出的方法。结果表明,在组件质量下降412 kg的情况下,首阶固有频率提高2.268%,X向和Y向动柔度分别下降10.032%和6.298%,动态性能提升显著。所提出的质量匹配设计流程与方法为机床整机结构动态性能改进提供了重要的方法和理论依据。
In this paper, the quality of machine tool structure is taken as the design variable, and the highest dynamic performance of the whole machine is taken as the design goal. Experimental design, response surface fitting and multi-objective genetic algorithm are used synthetically to realize the optimal matching design of supporting structure. Take a horizontal machining center column assembly as an example to verify the proposed method. The results show that the natural frequency of the first order increases by 2.268% and the dynamic extensibility in the X direction and the Y direction decreases by 10.032% and 6.298%, respectively, with a decrease of 412 kg of component mass. The dynamic performance is significantly improved. The proposed quality matching design flow and method provide an important method and theoretical basis for the improvement of the dynamic performance of machine tool.