A tool wear condition monitoring approach based on integrated neural networks was
proposed to recognize and predicttoolwearconditions inmilling operations. In this approach, vibration
and cutting force signals are decomposed into time sequences in different frequency bands bywavelet
packet transform, and the rootmean square values of each signal in three frequency bands, extracted
from decomposed signals, with a close relation towear conditions are selected asmonitoring features.
The final recognition results of tool wear are given by the integrated neural networks through the
combination of signals and the decision fusion of different subnets. Experiments and simulations show
that the proposed approach canmeet the requirements ofon-linemonitoring of toolwear conditions.