薄板件铣削颤振稳定性的非线性判据实验研究

摘要

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，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。%The nonlinear dynamic behavior of milling process accompanies the entire cutting process.In order to accurately determine and predict the chatter stability of machining process,a nonlinear criterion for milling shatter stability of a thin part fixed at its two ends was studied with tests.Vibration signals of the thin part were taken as the study object in test,based on the phase plane method,Poincare method and spectra the vibration signals under different processing parameters were analyzed and plotted.The relationships between the maximum Lyapunov exponent and the spindle rotating speed,the former and the milling depth were discussed.Finally,taking the maximum Lyapunov exponent as the criterion, the milling chatter stability domain of the thin part was determined with the contour method,compared with the milling chatter stability domain obtained with the full discrete method,the nonlinear criterion for the milling chatter stability domain of a thin part made of aviation aluminum alloy 7075-T6 was obtained with tests.