铣削过程中非线性动力学行为一直伴随整个切削过程，为准确地判定和预测加工过程的颤振稳定性，本文基于实验方法，研究了两端固定薄板件铣削颤振稳定性的非线性判据。实验中以薄板件振动信号为研究对象，基于相平面法、庞加莱法和频谱分析了不同加工参数时的振动信号，绘制并讨论了最大Lyapunov指数与主轴转速和铣削深度的变化关系。最后以最大Lyapunov指数作为判据，通过等高线法确定铣削颤振稳定域，并和基于全离散法得出的铣削颤振稳定域进行比较分析，实验得出了航空铝合金7075-T6薄板件颤振稳定域的非线性判据。
Abstract
The nonlinear dynamic behavior of milling process has been accompanied by the entire cutting process, in order to accurately determine and predict chatter stability of machining process, this article studied at both ends of the fixed thin part nonlinear criterion of milling chatter stability with experimental method. The vibration signal of thin part as the study object in the experiment, based on the phase plane method, Poincare method and spectral analyze the vibration signal of different processing parameters, plotted and discussed changes in the relationship between the maximum Lyapunov exponent and the spindle speed and milling depth. Finally, the largest Lyapunov exponent as the criterion, determine the chatter stability domain of milling by contour method, and based on the full discrete method obtains the milling chatter stability domain comparative analysis, the experiments obtained the nonlinear stability criterion of aviation aluminum alloy 7075-T6 thin part.
关键词
薄板件 /
铣削颤振 /
非线性判据 /
李雅谱诺夫指数
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Key words
Thin part /
Milling chatter /
Nonlinear criterion /
Lyapunov exponent
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