Optimization and damping performance of constrained damping boring bar

被引：0
|
作者：
Liu Y. [1 ]
Liu Z. [1 ]
Song Q. [1 ]
机构：
[1] Key Laboratory of High Efficiency and Clean Mechanical Manufacture, School of Mechanical Engineering, Shandong University, Jinan
来源：
Liu, Zhanqiang (melius@sdu.edu.cn) | 1992年 / Chinese Society of Astronautics卷 / 37期
基金：
中国国家自然科学基金;
关键词：
Constrained damping; Cutting stability; Loss factor; Modal experiment; Structure optimization;
D O I：
10.7527/S1000-6893.2015.0241
中图分类号：
学科分类号：
摘要：
The constrained damping boring bar can effectively reduce the cutting chatter affecting the surface quality and accuracy in hole machining, but the effect is not significant because the mechanism has not been fully found out. The theoretical and experimental research of the structure optimization, optimal material selection and vibration damping characteristic of the constrained damping boring bar is finished in this paper. Firstly, the dynamics model of the constrained damping boring bar is established through Kelvin-Voigt's viscoelastic mechanics model theory, and it is proved that the increase of static stiffness and loss factor of the boring bar can enhance the vibration damping performance to improve the quality of machining. Secondly, structure optimization and optimal material selection are completed based on the static stiffness and loss factor theory formula, and the result shows that there is an optimal size range that can reduce the vibration on the main working frequency domain, then it is shown that the elastic modulus of damping layer should be reduced while the elastic modulus of constraining layer and the material loss factor of damping layer should be increased. Finally, four constrained damping boring bars with different materials are designed and manufactured, and the modal experimental results of the static stiffness and loss factor have little difference with the theoretical calculation results. Further study of the influence of material and cutting parameters on the vibration damping performance in machining shows that constrained damping boring bars can effectively reduce the radial vibration to improve the surface quality. The radial vibration of constrained damping boring bars with different materials has great differences in cutting process, and the radial vibration acceleration of the optimized steel-PMMA-carbide boring bar is smaller and more stable at different cutting depths and spindle speeds. © 2016, Press of Chinese Journal of Aeronautics. All right reserved.
引用
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页码：1992 / 2002
页数：10
相关论文
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