车削加工过程中轴类工件频响函数的快速预测

发布时间：2018-05-05 11:08

本文选题：频响耦合子结构法 + 柔性耦合　；参考：《机械工程学报》2017年15期

【摘要】：轴类工件在车削加工过程中由于材料去除,其动力学特性会实时变化。快速准确预测工件频响函数是构建车削稳定性极限图,防止车削颤振的关键环节。通过分析轴类工件连接界面的变形特性,发现刚性耦合条件下的频响耦合子结构法在预测轴类工件频响函数时具有局限性。在此基础上,考虑连接界面刚度影响因素,推导出连接界面刚度的计算方法,利用柔性耦合条件下的频响耦合子结构法建立了加工过程中轴类工件频响函数求解快速预测模型。试验与理论分析结果表明:柔性耦合模型能够快速准确地预测轴类工件随材料去除时的频响函数变化;与刚性耦合模型相比,柔性耦合模型对频响函数预测的准确性受工件尺寸变化影响较小,模型应用范围更广。
[Abstract]:The dynamic characteristics of shaft workpieces will change in real time due to material removal during turning. Fast and accurate prediction of workpiece frequency response function is the key link to construct turning stability limit diagram and prevent turning chatter. By analyzing the deformation characteristics of the shaft workpiece interface, it is found that the frequency response coupling substructure method under rigid coupling condition has limitations in predicting the axial workpiece frequency response function. On this basis, considering the influence factors of connection interface stiffness, the calculation method of connection interface stiffness is deduced, and the fast prediction model of shaft workpiece frequency response function in machining process is established by using frequency response coupling substructure method under flexible coupling condition. The experimental and theoretical results show that the flexible coupling model can quickly and accurately predict the change of frequency response function of axial workpieces with material removal, and compare with the rigid coupling model. The accuracy of the flexible coupling model for the prediction of the frequency response function is less affected by the change of the workpiece size, and the model is applied more widely.
【作者单位】：西安交通大学机械制造系统工程国家重点实验室;
【基金】：国家自然科学基金重点(51235009) 陕西省自然科学基础研究计划(2015JQ5126)资助项目
【分类号】：TG51

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