多功能机床关键导轨副动态特性分析

Dynamic characteristics of major guide pairs in the compound machine tool

针对多功能机床关键滑块导轨运动副HG45CA结构,采用东方所试验模态设备和CASP软件对约束状态的滑块导轨副进行了动态性能分析。试验研究得到的导轨滑块固有动态参数表明:滑块导轨运动副具有横摇、横荡、垂荡、首摇和扭转前5阶固有振型,其固有振动频率在300~1 000 Hz之间;试验得到的导轨滑块阻尼比在0.1以下,说明滑块导轨运动副属于粘性阻尼振动系统,并计算得到导轨滑块的刚度和阻尼值;试验结果为机床振动环境下导轨滑块的强迫振动性能奠定理论基础,并为进一步深入分析机床整体振动系统特点提供了关键参数。另外,导轨滑块的试验模态机理、试验方案和试验数据的分析为相关试验研究提供了借鉴。

To study the structural characteristics of the key guide pairs( HG45CA) in the compound machine tool,use the COINV equipments and the CASP software to study the guide- slider restriction features.The results show that there are rolling,sway,heave,yaw and torsion modes in the guide- slider vibration system; in addition,the frequency domain is 300 ~ 1 000 Hz,and the damping ratios are less than 0. 1 to indicate the guide pairs are viscous vibration system. Then calculate the guide- slider damping value and stiffness value. Furthermore,the experimental data provide the theoretical basis and vibration parameters for the machine tool forced vibration analysis,and the guide- slider experimental modal analysis offers the mathematical theory,the testing design and measurement data study for similar research.