柔性工件金属切削机床加工中的2 DOF模型  

2 DOF Model in Metal Cutting Machine of Flexible Workpiece

作　　者：宋新[1] 冯东栋[2] SONG Xin;FENG Dongdong(College of Mechanical Engineering,Yellow River Conservancy Technical Institute,Kaifeng Henan 475000,China;School of Software,Henan University,Kaifeng Henan 475000,China)

机构地区：[1]黄河水利职业技术学院机械工程学院,河南开封475000 [2]河南大学软件学院,河南开封475000

出　　处：《机床与液压》2022年第13期85-89,共5页Machine Tool & Hydraulics

基　　金：河南省高等学校科学研究计划项目(20A180018)。

摘　　要：针对细长轴工件车削过程中的颤振抑制问题,提出一种可在状态空间域中分析柔性工件金属切削过程的2 DOF模型。对端面车削操作中细长轴工件的模态解耦效应进行分析,并在状态空间中对该2 DOF模型进行理论分析,得出由切削过程和工件形成的系统特征值解析式。对系统稳定性进行分析,确定无颤振的条件,并通过模型仿真,得到系统固有频率与切削速度的函数关系。在CNC数控车床上对细长轴工件加工进行实际测试。结果表明:对于初始直径为38.2 mm的C45钢制细长轴工件,在相同切削条件下,仿真和实测的频率均收敛到792.8 Hz,且最低切削速度为105 m/min,验证了该模型的有效性。该模型可用于更准确地预测细长轴工件加工的稳定极限,进而有效地预防颤振发生。Aiming at the problem of chatter suppression in the turning process of slender shaft workpiece,a 2 DOF model was proposed to analyze the metal cutting process of flexible workpiece in the state space domain.The modal decoupling effect of slender shaft workpiece in face turning operation was analyzed,the 2 DOF model was theoretically analyzed in state space,and the analytical expression of system eigenvalue formed by cutting process and workpiece was obtained.The stability of the system was analyzed to determine the no flutter condition,and the functional relationship between the natural frequency of the system and the cutting speed was obtained through model simulation.The machining of slender shaft workpiece was actually tested on CNC lathe.The results show that for the C45 steel slender shaft workpiece with the initial diameter of 38.2 mm,the simulated and measured frequencies converge to 792.8 Hz under the same cutting conditions,and the minimum cutting speed is 105 m/min,which verifies the validity of the model.This model can be used to predict the stability limit of slender shaft workpiece more accurately,then to effectively prevente chatter.

关 键 词：柔性工件 车削 颤振 模态耦合 2 DOF模型 

分 类 号：TH161[机械工程—机械制造及自动化] TG54[金属学及工艺—金属切削加工及机床]