铝合金平面薄壁件动态特性研究与建模

Dynamic Characteristics Study and Modeling of Aluminum Alloy Flat Thin-Walled Parts

针对三类常见的铝合金材料(6061/7050/7075)薄壁件,基于锤击实验的方法,开展了考虑切削路径频响函数模态参数的识别研究,获得了其动态特性影响因素,并构建了考虑切削振动的薄壁件动态特性模型。研究结果表明:6061/7050铝合金薄壁件固有频率随切削路径向工件中线靠近而增加,7075铝合金薄壁件则变化不明显。该文所构建模型可有效预测薄壁件加工路径上模态参数的变化。

For the three kinds of thin-walled aluminum alloy materials(6061/7050/7075),based on the method of hammer experiment,the identification of frequency response function modal parameters considering the cutting path is carried out,the influencing factors of their dynamic characteristics are obtained,and the dynamic characteristics modeling of thin-walled parts considering cutting vibration is constructed.The results show that the natural frequency of 6061/7050 aluminum alloy thin-walled parts increases with the cutting path approaching the workpiece center line,while the change is not obvious in 7075.The model can effectively predict the change of modal parameters in the machining path of thin-walled parts.