基于模态分布表的数控车床切削振动诊断分析

发布时间：2018-04-02 19:15

本文选题：振动与波　切入点：模态分布表　出处：《噪声与振动控制》2016年06期

【摘要】：为了建立批量型数控车床准确的模态分布表,跟踪记录十余台套车床装配过程中的工艺信息,同时运用动态测试手段获取了装配序列的每组模态参数。总结该型机床的模态分布表,分析出整机中部件结构和装配工艺对整机动态特性的贡献量。对该型机床在各种切削状态下出现的振动问题进行归类,按照振动谱系的振幅特征其可以分为两类:精加工状态下出现的微振动和粗加工状态下出现的强振动。通过多台套机床的加工试验分析发现:精加工状态下,只有部分机床出现这类微振动问题,判断是装配环节的差异性引起的;粗加工重切削状态下,所有的机床都出现了切削振纹现象,判断可能是部件结构或结合面的装配工艺引起的。对照模态分布表,可以诊断出装配序列工艺信息中对微振动影响较大的环节,同时可以分析出部件结构或结合面工艺引起强振动的薄弱环节所在,根据诊断分析结论可对该型机床进行针对性的优化改进。
[Abstract]:In order to establish accurate modal distribution table of batch NC lathe, process information of more than ten sets of lathes during assembly is recorded, and each group of modal parameters of assembly sequence is obtained by means of dynamic test.The modal distribution table of the machine tool is summarized, and the contribution of component structure and assembly process to the dynamic characteristics of the machine is analyzed.The vibration problems of the machine tool under various cutting conditions are classified. According to the amplitude characteristics of the vibration spectrum, the vibration can be divided into two categories: micro vibration in finishing state and strong vibration in rough machining state.Through the analysis of machining experiments of multi-sets of machine tools, it is found that only some machine tools have this kind of micro-vibration problem in the state of finishing, the judgment is caused by the difference of assembly links, and under the condition of heavy cutting in rough machining,All machine tools have the phenomenon of cutting vibration, which may be caused by the assembly process of component structure or joint surface.Comparing with the modal distribution table, we can diagnose the links in the assembly sequence process information which have a great influence on the micro-vibration, and at the same time, we can analyze the weak link of the component structure or the technology of the bonding surface that cause the strong vibration.According to the conclusions of diagnosis and analysis, this type of machine tool can be optimized and improved.
【作者单位】：沈阳鼓风机集团申蓝机械有限公司;
【分类号】：TG519.1

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