在简要介绍数控机床模态测试原理的基础上,对某机床厂生产的CK5116数控立式车床的模态及动态特性进行了测试,获得了机床整机的固有频率、模态振型、阻尼比、动刚度、动柔度等动态特性参数.通过测试发现,该机床的立柱在沿y方向的振动是该机床的薄弱环节,导致y方向的动刚度显著降低.在综合分析的基础上,提出在立柱内增设加强筋的方式来提高机床整机系统的动态特性,为同类型机床的结构性能优化提供有效的参考.%After brief introducing the principle of the modal testing of CNC machine tools, such as modal and dynamic characteristics were tested for a machine tool factory produced CK5116 lathe, and obtained a machine tool's natural frequency, mode shapes, damping ratio, dynamic stiffness, dynamic flexibility and other dynamic parameters. Test found that the machine column along the y direction of vibration of the machine's weak link, resulting in the y direction the dynamic stiffness was significantly reduced in the comprehensive analysis, based on the proposed column of additional ribs way improve the dynamic characteristics of machine tool systems, the structure of the same type of performance optimization tools to provide effective reference.
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