机床刚度非线性特征与刚度链薄弱环节识别方法研究
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摘要
文中主要研究机床刚度在复杂工况下的线性变化情况,利用机床实体测量刚度,结合有限元对机床整机模型进行刚度仿真理论计算,绘制刚度特性变化曲线。建立机床串联刚度场模型,找出薄弱环节,即滚动轴承刚度表现出的剧烈的时变特性和非线性特性,是引起系统刚度变化的主因,分析轴承对机床刚度的影响并加以改善。
In this paper, the linear variation of machine tool stiffness under complex working conditions is studied. The stiffness characteristic curve is drawn by measuring the stiffness of machine tool entity and drawing the stiffness theory of machine tool model with finite element method. A series stiffness field model of machine tools is established to find out the weak links, and the stiffness of rolling bearings shows severe time-varying and nonlinear characteristics, which is the main cause of the stiffness change of the system. The influence of bearings on the stiffness is analyzed and improved.
In this paper, the linear variation of machine tool stiffness under complex working conditions is studied. The stiffness characteristic curve is drawn by measuring the stiffness of machine tool entity and drawing the stiffness theory of machine tool model with finite element method. A series stiffness field model of machine tools is established to find out the weak links, and the stiffness of rolling bearings shows severe time-varying and nonlinear characteristics, which is the main cause of the stiffness change of the system. The influence of bearings on the stiffness is analyzed and improved.
引文
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[10]DIRKS B, ENBLOM R. Prediction model for wheel profile wear and rolling contact fatigue[J]. Wear, 2011, 271(1):210-217.
[2]陈日曜.金属切削原理[M].北京:机械工业出版社,2006.
[3]徐怀圣,董宝文.数控机床的结构特征及提高性能的措施[J].中国科技博览,2012(5):608.
[4]蒲秋林,黄筱调,洪荣晶,数控化再制造机床导轨接合面刚度分析[J].组合机床自动化加工技术,2010(10):16-19.
[5]郭成龙,袁军堂,张华.滚动导轨接合面动态刚度的实验研究[J].机械设计与制造,2011(12):115-117.
[6]CHEN H,LIU G F,YIU Y K.Advadtages of parallel manipulators with redundant actuation[C]//International Conference on Inte lligent Robots and Systems.2011:171-176.
[7]KIM J, YOON J C, KANG B S.Finiteelement analysis and modeling structure with bolted joints[J].Applied Mathematical Modeling,2007,31:895-911.
[8]KIM B H, PARK T,SHIN H Y,et al.A comparative study of the tension estimation methods for cable supported bridges[J].Steel Strectures,2007,7(3):77-84.
[9]ZHOU Lihua,WANG Yuru,HUANG Tian, et al.Stiffness Analysis of the Main Module for Parallel Machine Tools by Finite Element Analysis[J].Transactions of Tianjin University,2001,7(1):30-35.
[10]DIRKS B, ENBLOM R. Prediction model for wheel profile wear and rolling contact fatigue[J]. Wear, 2011, 271(1):210-217.