Bolt Tightening Using Impact Wrench Based on Neural Networks
Toru Fujinaka, Hirofumi Nakano, Michifumi Yoshioka, and Sigeru Omatu
Division of Computer and Systems Science, Graduate School of Engineering Osaka Prefecture University, 1-1 Gakuen-cho, sakai, Osaka 599-8531, Japan
A method for controlling the tightening operation of bolts using an impact wrench is proposed, where the neural network is employed for achieving proper clamping force. The characteristics of the clamping force depend on the kind of work to which bolts are tightened, thus a neural network is used for classification of the work. The clamping force, which can only be measured during the test run, is estimated online, using another neural network. Then appropriate input to the actuator of the impact wrench is determined, based on the estimated value of the clamping force.
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