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YKW51250插齿机床身是关键的承载大件,其动态性能的好坏将直接影响整机的加工精度和稳定性。为实现床身的快速动态优化设计,提出了一种新的机床动态特性分析方法,这是一种基于元结构理论的分析方法,将元结构理论合理应用于机床动力学领域。首先,使用Python语言建立元结构的参数化模型,分析机床床身元结构各主要参数对其动态特性的影响。在此基础上,对床身元结构参数进行多目标优化,得到了元结构的固有频率和质量,以及元结构参数间映射关系和多目标优化的Pareto解集。再次,通过LMS试验验证了优化结果。最后,通过YKW51250插齿机床身算例证明了该方法是可行的,床身低阶固有频率得到了较大幅度的提高,改善了床身的动态特性,实现了根据机床元结构变量制造满足相应要求的机床的目标,具有较高的精度和较强的工程实用性。
YKW51250 gear shaper machine tool is the key bearing large, the dynamic performance of the machine will directly affect the accuracy and stability. In order to realize the rapid dynamic optimization design of the bed, a new method to analyze the dynamic characteristics of the machine tool is proposed, which is based on the meta-structure theory and applies the meta-structure theory to the field of machine tool dynamics reasonably. First of all, a parametric model of metamodel was built by using Python language to analyze the influence of the main parameters of machine bed body structure on its dynamic characteristics. On this basis, the multi-objective optimization of the structural parameters of the bed body element is achieved, and the natural frequencies and masses of the meta-structure and the Pareto solution set of the mapping relationship and multi-objective optimization of the meta-structure parameters are obtained. Thirdly, the optimization results were verified by LMS test. Finally, the example of YKW51250 gear shaper machine is proved to be feasible. The low-order natural frequency of the bed body is greatly improved, the dynamic characteristics of the bed body are improved, and the machine tool structural variables satisfying the requirements The requirements of the machine tool target, with high accuracy and strong engineering practicability.