利用庞加莱原理,分析了稳定切削与不稳定切削时振动信号频域特征的不同点.搭建了铣削振动检测系统,通过对铣削振动信号的频域分析,验证了铣削强迫振动的频域特征是在低频段的刃通过频率及其二、三倍谐波频率处出现峰值;发生切削颤振时,在高频段出现峰值,因此,振动信号频谱图中非刃通过频率处及其二、三倍谐波频率处出现峰值是发生切削不稳定的结论. The Poincaré principle is used to analyze the difference of the frequency domain characteristics of vibration signals between stable cutting and unstable cutting.Milling vibration detection system is set up and frequency domain analysis of milling vibration signal is validated by frequency domain analysis of milling vibration signal Is in the low frequency band edge frequency and its second and third harmonic frequency peak; chatter occurs when the peak appears in the high frequency band, the vibration signal spectrum at the non-blade through the frequency and its two, three The peak at double harmonic frequency is the result of unstable cutting.