重载摆角铣头模态分析与实验研究  

Modal analysis and experimental research on heavy load angularly deflecting milling head

作　　者：蔡力钢[1] 马仕明[1] 赵永胜[1] 刘志峰[1] 郭铁能[1] 

机构地区：[1]北京工业大学精密超精密加工国家工程研究中心,北京100124

出　　处：《振动与冲击》2011年第7期250-255,共6页Journal of Vibration and Shock

基　　金：国家科技重大专项(2009ZX04002-031);国家科技支撑计划(2006BAF01B09-04);北京市科委项目(D08010400130803)

摘　　要：重载摆角铣头是重型五轴联动数控机床的重要功能部件,用于大型复杂曲面的加工。这类铣头的特点是必须同时实现回转和摆角等多自由度运动、结构紧凑、重载和高刚度。掌握铣头的模态特性及其影响因素之间的关系,是重载摆角铣头自主研发必须解决的关键问题。为此,提出一种多约束方式下的理论分析与实验验证相结合的综合研究方法。在理论分析方面,模拟铣头悬挂状态和实际工况两种约束方式,对摆角铣头进行了模态分析和比较,相互验证两种约束状态下理论分析的正确性。在实验研究方面,铣头箱体采用自由支撑、铣头整体采用原装固定的方式分别进行了模态实验研究,并将实验研究结果和上述理论分析结果进行了比较和分析。从而得到铣头准确的模态特性、薄弱环节及其影响因素,为国产重载摆角铣头的结构优化设计和改进提供理论与实验支持。In order to solve the problems in further development of heavy load angualarly deflecting milling head,an integrated research method which combines experimental validation and theoretical analysis under many styles of constraint was introduced.In theoretical analysis aspect,modal analyses of milling head in the two kinds of states,namely,the appending state and the real working state were carried out respectively,which mutually validate the correctness of theoretical analysis under these two styles of constraint.In experimental research aspect,modal experiments were carried out with freely supported box and with initially wholly fixed milling head respectively.Experimental and theoretical analysis results were compared and discussed.So,exact modal characteristics of milling head and unsubstantial segments with its influencial factors were gotten,which provide theoretical and experimental support for structural optimization and improvement of heavy load angularty deflecting milling head.

关 键 词：重载 铣头 模态分析 实验研究 多约束方式 

分 类 号：TH113.1[机械工程—机械设计及理论]