In order to dis-tinguish tool breakage in milling process a stochastic M Model is established, the parameters of whichare estimated by LMS method.

• 建立了铣削过程的随机自回归模型，将自回归算法应用到刀具破损监测中，并介绍了用最小均方算法对自回归模型进行参数估计的方法；