五轴联动精密微铣削机床试验模态分析 - 中国测试.pdf

第42卷第7期 中国测试 Vol.42 No.7 2016年7月 CHINA MEASUREMENT TEST July，2016 doi院10.11857/j.issn.1674-5124.2016.07.025 五轴联动精密微铣削机床试验模态分析 李 伟袁 许金凯袁 张向辉袁 于化东 （长春理工大学机电工程学院，吉林 长春 130022） 摘 要院五轴联动精密微铣削机床的结构性能直接影响精密三维微小零件的加工质量袁为研究其结构性能袁应用试验 模态分析技术对五轴联动精密微铣削机床进行结构分析遥 采用单点激励多点响应的方法进行锤击试验袁 建立传递函 数袁经分析处理得出机床固有频率尧阻尼比与振型等动态特性参数袁并对识别的参数进行模态置信矩阵渊MAC冤校验遥试 验得到机床前三阶固有频率为 102.44袁133.97袁154.86Hz袁对应阻尼比为3.27%尧4.94%尧2.14%曰试验结果证明该五轴精 密微铣削机床结构布局合理袁机床固有频率有效避开微切削加工的激振频率袁通过振型分析可找出机床结构薄弱环 节袁并提出优化建议遥 试验验证应用试验模态分析技术对机床动态特性分析方法的有效性遥 关键词院模态分析曰模态参数曰试验模态曰五轴联动 文献标志码院A 文章编号院1674-5124渊2016冤07-0123-04 Experimental modal analysis of five-axis precision micro-milling machine tool LI Wei，XU Jinkai，ZHANG Xianghui，YU Huadong （Electromechanical Engineering College，Changchun University of Science and Technology， Changchun 130022，China） Abstract: The performance of five-axis linkage precision micro-milling machine tool structure has direct influence on the quality of machining 3D precision micro components. In order to study the property of the machine tool structure，it was analyzed with experimental modal analysis technique. The hammer test was conducted by the method of a single-point excitation and multi- point response，and the transfer functions were set up. Dynamic characteristic parameters of the machine tool structure including its natural frequencies，damping ratios and vibration modes were obtained by the analysis and processing. Also，the modal parameters were verified by the modal assurance criterion （MAC）. The first three of the natural frequencies obtained by the experiment a