CNC planer type milling machine in a certain company is designed by using empirical method and without considering the whole machine processing impacts of the dynamic characteristics. And the dynamic performance of the milling machine has important effect on the processing quality of parts. The whole ma-chine finite element model is established by finite element analysis software ANSYS workbench. The first six nature frequencies and modes are obtained by modal analysis, and it is easy to resonate that the first na-ture frequency is low. The vibration response of cutter under dynamic cutting force is obtained by harmonic response analysis. The weakness link of the whole machine dynamical characteristics is found. It provides the theoretical for the structure improvement.%某公司数控龙门铣床是采用经验设计,没有考虑到动态特性对整机加工的影响,而铣床的动态性能对零件的加工质量有重要影响. 采用有限元分析软件ANSYS Workbench建立了整机的有限元模型,对龙门铣床进行模态分析,得到了前六阶固有频率和振型,发现第一阶固有频率较低,容易发生共振. 并对龙门铣床进行了谐响应分析,获得动态切削力下刀具的振动响应,找到整机动态特性的薄弱环节,为结构改进提供理论依据.
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