对金属切削中的一类非线性问题——切屑流屑角的突变进行了检测实验研究 ,得出了流屑角突变时刻的力、振动和声发射信号。多次实验表明 ,这 3种信号中对切削过程的非线性特征以切削力信号最为灵敏。根据传感器突变信号的产生时间 ,可以计算出突变时的切削层厚度 aw 和切削层图形系数 gs A kind of non-linear problem in metal cutting, ie, the change of chip flow chip angle, was tested and studied. The force, vibration and acoustic emission signals were obtained when the chip flow angle was abruptly changed. Several experiments show that the three kinds of signals in the cutting process of the nonlinear characteristics of the cutting force signal is the most sensitive. According to the sensor mutation signal generation time, you can calculate the abrupt change in the thickness of the cutting layer aw and cutting layer graphics coefficient gs