In order to study the influences of process parameters on dry cutting process, a signal acquisition system was set up to sample vibration signals in dry milling process. The sampled data were analyzed in time domain and frequency domain.The

results show that:vibration in dry milling is mainly caused by forced vibration, which is inherent in milling process because of the intermittent cutting;RMS value of vibration signals has complex non-linear relationship with cutting speed, feed per tooth and radial depth of cut;frequency components of vibration signals mainly concentrate in three bands in

0~20kHz,and changes of processing parameters result in change in energy ratios of the three bands.

dry milling, vibration signal, root mean square(RMS), wavelet packet, process parameter

为了研究不同工艺条件对干式切削加工过程的影响,建立了一套信号采集系统。通过该系统采集了航空铝合金干式铣削过程的振动信号,并从时域、频域角度对其进行了分析研究。研究结果表明:干式铣削过程的振动主要来自于铣削过程固有的间断切削产生的强迫振动,铣削振动信号具有准周期性;振动信号的均方根(RMS)值与主轴转速、每齿进给量、铣削宽度呈复杂的非线性关系;振动信号的能量主要集中在0~20kHz的三个频率带内,信号在这三个频率带内的能量百分比随工艺参数的变化而变化。

干式铣削, 振动信号, 均方根（RMS）, 小波包变换, 工艺参数