外圆车削加工过程中再生型颤振的建模与分析  

Modeling and Analysis on regenerative fluttering for cylindrical turning

作　　者：郭瑞琴[1] 武帅[1] 李中[1] 

机构地区：[1]同济大学机械与能源工程学院,上海201804

出　　处：《中国工程机械学报》2015年第3期252-257,共6页Chinese Journal of Construction Machinery

摘　　要：再生型颤振是制约车削加工效率和零件质量的重要因素.以CA6140型普通车床为研究对象,考虑外圆车削加工过程中刀具的动态特性,建立了三自由度再生型颤振的动力学模型,理论分析了模型的固有频率和主振型,在此基础上借助于MATLAB/Simulink对刀具开始接触工件至稳定切削这一过渡阶段刀具振动的瞬态响应进行了仿真研究.研究结果表明:在一阶固有频率下,刀具切向上振动最大,轴向上次之,径向上最小;且在过渡阶段刀具各方向的振动逐渐减小并收敛于某定值.验证了三自由度外圆车削颤振动力学模型的正确性,为类似机床振动的研究提供了新思路和新方法.Owing that the regenerative fluttering is a critical constraint to turning efficiency and part quality,a three-freedom-degree dynamical model is established for a CA6140 turning machine with consideration of dynamic tool properties during cylindrical turning.By theoretically analyzing the inherent and main frequencies,transient response on tool vibrations from initial contact with to stable cutting on workpiece is simulated using MATLAB/SimulinkTM.It is indicated from results that,under the first-order inherent frequency,the vibrations from maximum to minimum are resulted from tangential,axial to radial directions.In addition,the vibrations during transit stage are decreased and converged to a fixed value.To this end,the correctness of the proposed model is verified to provide new conception and method for machine tool vibration research.

关 键 词：外圆车削加工 再生型颤振 动态切削力 瞬态响应 

分 类 号：TG51[金属学及工艺—金属切削加工及机床]