• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (17): 94-99.doi: 10.3901/JME.2018.17.094

• 特邀专栏:智能制造装备 • 上一篇    下一篇

基于铣削动力学的刀具强迫振动抑制研究

张洁1,2, 刘成颖1,2, 郑烽3, 尹腾飞1,2   

  1. 1. 清华大学机械工程系 北京 100084;
    2. 清华大学精密超精密制造装备及控制北京市重点实验室 北京 100084;
    3. 电子科技大学机械电子工程学院 成都 611731
  • 收稿日期:2017-11-22 修回日期:2018-02-19 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 刘成颖(通信作者),女,1960年出生,副教授。主要研究方向为数控机床智能化制造技术、精密驱动与控制。E-mail:liucy@tsinghua.edu.cn
  • 作者简介:张洁,男,1992年出生。主要研究方向为切削过程稳定性预测及应用。E-mail:mezhangj@163.com
  • 基金资助:
    国家科技重大专项资助项目(2013ZX04001-021)。

Research on Suppression of the Forced Vibration of the Cutter Based on the Milling Dynamics

ZHANG Jie1,2, LIU Chengying1,2, ZHENG Feng3, YIN Tengfei1,2   

  1. 1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084;
    2. Beijing Key Laboratory of Precision/Ultra-precision Manufacturing Equipment and Control, Tsinghua University, Beijing 100084;
    3. School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731
  • Received:2017-11-22 Revised:2018-02-19 Online:2018-09-05 Published:2018-09-05

摘要: 铣削是实现高速、高性能金属切削加工最主要的形式,其稳定性、加工精度和加工质量一直是研究的热点。针对柔性双自由度铣削工艺系统,建立了时滞微分动力学模型,模型中的铣削力包含基于刚体运动学的静态切削力成分和基于再生效应的动态切削力成分,并通过全离散法预测了无颤振工艺参数区域。在保证了稳定加工的前提下,在频域内求解了由于断续切削引起的刀齿周期性强迫振动轨迹,利用表面位置误差和最大高度表面粗糙度评价加工精度与质量。理论和试验表明,在刀齿通过频率决定的共振转速下往往能获得较大的无颤振极限切深,而相邻两个共振转速的中间区域虽可避免共振,但较容易发生颤振。通过合理选择工艺参数,可以避免颤振的发生和实现对强迫振动的抑制。

关键词: 颤振, 强迫振动, 铣削动力学, 抑制

Abstract: Milling is the main method to achieve high speed and high performance metal cutting and its chatter stability, machining accuracy and machining quality have always been a hot research issue. The delayed differential model of a typical two degree of freedom milling system is built, in which the milling force contains static part based on the kinematics of a rigid body and dynamic part based on the regeneration effect. The chatter-free zone of cutting parameters is predicted by the full-discretization method. Under stable cutting conditions, the dynamical cutter tooth path is solved in the frequency domain concerning the interrupted cutting effect. Then the surface location error and the total height of the profile are used to estimate the machining accuracy and machining quality. The experiment basically agrees with theoretical prediction result and it shows that a big depth of cut can be used under resonant spindle speeds, while chatter is more easily to occur in the intermediate area of two neighboring resonant spindle speeds. Chatter can be avoided and the forced vibration can be suppressed by reasonably choosing cutting parameters.

Key words: chatter, forced vibration, milling dynamics, suppression

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