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用有限元方法对机床整机进行静动态特性计算时,划分网格较密,节点众多,不利于快速进行定量的分析,需要从中提取出简约模型及其与之对应的静动态特性。由此提出了简约模型关键节点选取原则,编制相应软件读取结果数据文件,提取相关节点的坐标、静态位移、动态振型等信息,绘制整机及静动态变形的简约模型图。以XK713B立式镗铣床为研究对象,在建立整机模型的基础上,分析其静动态特性,并利用编制的软件,形成简约模型,进行特性复现。结果表明:该立式镗铣床由原始的153238个节点简约为156个节点,并且很好地保留了机床各部件的结构特征和静动态特性,为简化后续的定量分析打下了基础。
When the finite element method is used to calculate the static and dynamic characteristics of the machine tool, the mesh is dense and has many nodes, which is not conducive to rapid quantitative analysis. Therefore, the simple model and its corresponding static and dynamic properties need to be extracted. Therefore, the principle of selection of the key nodes of the simple model is proposed. The corresponding software is read and the data files are read out. The coordinates, static displacement and dynamic mode shapes of the relevant nodes are extracted to draw the simple model of the whole machine and the static dynamic deformation. Taking XK713B vertical boring and milling machine as the research object, on the basis of establishing the whole machine model, the static and dynamic characteristics are analyzed and the software is used to form the simple model and reproduce the characteristics. The results show that the vertical boring and milling machine is simplified to 156 nodes from the original 153,238 nodes, and the structural characteristics and static and dynamic characteristics of each component of the machine tool are well preserved, laying a foundation for simplifying the subsequent quantitative analysis.