摘要
动态运动误差是影响数控机床加工精度的关键因素,但因其具有时变性、随机性与动态性,研究难度大,其产生机理尚不明确,严重阻碍了机床加工精度的提升。本文旨在溯源进给系统的动态运动误差,提出了基于机电-刚柔耦合特性分析的数控机床进给系统动态运动误差溯源方法。通过不同进给速度下切削圆试件,基于三坐标标定与球杆仪圆测试分离出由机械结构引起的动态运动误差。同时,基于机电刚柔耦合动力学模型进行仿真分析,其仿真结果与实验分离结果吻合度达70%以上,从而验证了该方法的可行性与动力学模型的准确性。
Dynamic motion error is a crucial factor affecting the machining accuracy of CNC machine tools. However, it is challenging to study due to its time-varying, random and dynamic characteristics. Also, its generation mechanism is not clear, which seriously hinders the improvement of machine tool machining accuracy. To trace the dynamic motion error, a dynamic model of feed system based on electromechanical rigid-flexible coupling analysis and relative dynamic motion error traceability method are proposed in this study. By cutting circular specimens at different feed rates, the dynamic motion error caused by mechanical structure is separated based on the calibration results of the coordinate measuring machine(CMM) and the results of double ballbar(DBB) circular test. Meanwhile, based on the electromechanical rigid-flexible coupling dynamic model for simulation analysis, the coincidence between the simulation results and the experimental separation results is more than 70%. Hence the feasibility of the method and the accuracy of the dynamic model are verified.
作者
卢成伟
吴铖洋
钱博增
向皖生
项四通
LU Chengwei;WU Chengyang;QIAN Bozeng;XIANG Wansheng;XIANG Sitong(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China;Ningbo Jingdiao CNC Engineering Co.,Ltd.,Ningbo 315211,Zhejiang,China;State Key Laboratory of Mechanical System and Vibration,Shanghai Jiaotong University,Shanghai 200240,China)
出处
《机械科学与技术》
CSCD
北大核心
2022年第10期1577-1584,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51705262)
浙江省自然科学基金项目(LY20E050005)。
关键词
进给系统
动态运动误差
机电-刚柔耦合
圆试件
feed system
dynamic motion error
electromechanical-rigid-flexible coupling
circular specimen
