| 立铣加工颤振稳定性时域求解与分析研究(英文) |
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| 作者单位： | 北京航空航天大学机械工程及自动化学院，北京航空航天大学机械工程及自动化学院 北京 100083湖南工业大学冶金学院株洲 412000，北京 100083 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，Fundamental Research Project of COSTIND |
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| 摘 要： | In this paper, the instantaneous undeformed chip thickness is modeled to include the dynamic modulation caused by the tool vibration while the dynamic regenerative effects are taken into account. The numerical method is used to solve the differential equations goveming the dynamics of the milling system. Several chatter detection criteria are applied synthetically to the simulated signals and the stability diagram is obtained in time-domain. The simulation results in time-domain show a good agreement with the analytical prediction, which is validated by the cutting experiments. By simulating the chatter stability lobes in the time-domain and analyzing the influences of different spindle speeds on the vibration amplitudes of the tool under a Fixed chip-load condition, conclusions could be drawn as follows： In rough milling, higher machining efficiency can be achieved by selecting a spindle speed corresponding to the axial depth of cut in accordance with the simulated chatter stability lobes, and in Fmish milling, lower surface roughness can be achieved by selecting a spindle speed well beyond the resonant frequency of machining system.
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| 关 键 词： | 高速碾磨 稳定性 动态切削力 时域模拟 |
| 收稿时间： | 1 September 2007 |
Solution and Analysis of Chatter Stability for End Milling in the Time-domain |
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| Authors: | Li Liu |
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| Institution: | [1]School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China [2]School of Metallurgy, Hunan University of Technology, Zhuzhou 412000, China |
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| Abstract: | In this paper, the instantaneous undeformed chip thickness is modeled to include the dynamic modulation caused by the tool vibra- tion while the dynamic regenerative effects are taken into account. The numerical method is used to solve the differential equations gov- erning the dynamics of the milling system. Several chatter detection criteria are applied synthetically to the simulated signals and the stability diagram is obtained in time-domain. The simulation results in time-domain show a good agreement with the analytical predic- tion, which is validated by the cutting experiments. By simulating the chatter stability lobes in the time-domain and analyzing the influ- ences of different spindle speeds on the vibration amplitudes of the tool under a fixed chip-load condition, conclusions could be drawn as follows: In rough milling, higher machining efficiency can be achieved by selecting a spindle speed corresponding to the axial depth of cut in accordance with the simulated chatter stability lobes, and in finish milling, lower surface roughness can be achieved by selecting a spindle speed well beyond the resonant frequency of machining system. |
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| Keywords: | high-speed milling chatter stability lobe dynamic cutting force time-domain simulation cutting parameter optimization |
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