摘要
针对某型小五轴高精密数控机床加工精度不高的问题,对其横梁的动态性能进行研究.采用锤击模态测试实验与有限元模拟计算相结合的方法,对横梁的固有频率进行研究;测量主轴不同转速下的振动速度和振动噪音,通过赋权处理,建立振动评价指标方程,得到优化目标;对所研究横梁进行形状优化.试验与仿真所得固有频率最大误差为5.76%;基于主轴振动情况确定83~117 Hz的频率范围,作为横梁设计时需要避开的低阶固有频率范围.经过形状优化后,横梁的一阶固有频率为139 Hz,相较于原横梁增加了约20.870%,横梁的动态性能得到改善.
Aiming at the problem that of low machining accuracy of a certain type of small five-axis high-precision CNC machine tool is not high,the dynamics of its beam is studied.The natural frequency of the beam is studied by combining the hammering mode test experiment and finite element simulation calculation.Measure the vibration speed and vibration noise at different speeds of the spindle,and the vibration evaluation index equation is established through weighting processing to obtain the optimization target.The shape of the studied beam is optimized.The maximum error of the natural frequency obtained by the test and simulation is 5.76%,and the frequency range of 83~117 Hz is determined based on the spindle vibration,which is the low-order natural frequency range that needs to be avoided in the design of the beam.After shape optimization,the first-order natural frequency of the beam is 139 Hz, which is an increase of about 20.870% compared with the original beam, and the dynamics of the beam is improved.
作者
叶寒
高艺
刘军
张军
李莉
刘旭波
李诗晨
董高翔
姜乐付
郭俊辉
刘华
YE Han;GAO Yi;LIU Jun;ZHANG Jun;LI Li;LIU Xubo;LI Shichen;DONG Gaoxiang;JIANG Lefu;GUO Junhui;LIU Hua(College of Advanced Manufacturing,Nanchang University,Nanchang 330009,China;Jiangxi Jiashite CNC Co.,Ltd.,Nanchang 330052,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第2期219-226,共8页
Journal of Hunan University:Natural Sciences
基金
小型立式五轴加工中心研发项目(HX202302170001)。
关键词
动态性能
模态测试实验
有限元
赋权处理
振动评价指标
dynamics
modal test experiments
finite elements
empowerment processing
vibration evaluation index
作者简介
通信联系人:叶寒(1976―),男,江西进贤人,南昌大学副教授,工学博士,E-mail:yehan@ncu.edu.cn。
