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      Forced vibration response during the milling of thin-walled workpieces

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          Abstract

          Strong forced vibrations can easily occur while milling thin-walled workpieces because of their low stiffness. Such vibrations not only reduce the product quality, but also limit the choose of the machining parameters. The forced vibrations of thin-walled workpieces during milling were investigated by using an R-end milling cutter to reduce the cutting forces and the cutting coefficients in cutting experiments. The dynamics of the thin-walled workpiece were analyzed based on modal experiments to obtain the transfer function and modal parameters of the tool-workpiece system. The forced vibration response was then predicted using a time-domain method. The simulations indicate that a proper nose radius can suppress the forced vibration response.

          Abstract

          摘要 由于薄壁工件刚度较低, 在加工过程中极易出现较强的强迫振动, 因此导致工件加工质量降低, 并进一步限制了工艺参数的选择。为求解薄壁工件的强迫振动响应并对其加以抑制, 该文针对圆角立铣刀, 基于力学方法建立了铣削力模型, 通过实验标定切削力系数; 基于实验模态分析方法, 对薄壁工件的动态特性进行分析, 得到刀具-工件振动系统的传递函数和模态参数; 基于直接时域求解方法得出了薄壁结构受切削力激励产生的强迫振动响应 (forced vibration response, FVR), 并以稳态响应最大振幅为判断依据描述工件的振动强度。最后通过仿真得出了刀尖半径对强迫振动响应具有抑制作用的结论。

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          Author and article information

          Journal
          J Tsinghua Univ (Sci & Technol)
          Journal of Tsinghua University (Science and Technology)
          Tsinghua University Press
          1000-0054
          15 November 2018
          21 November 2018
          : 58
          : 11
          : 961-965
          Affiliations
          1Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
          Author notes
          *Corresponding author: LIU Chengying, liucy@ 123456tsinghua.edu.cn
          Article
          j.cnki.qhdxxb.2018.25.042
          10.16511/j.cnki.qhdxxb.2018.25.042
          Copyright © Journal of Tsinghua University

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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