ワイヤ放電加工機のワイヤ走行系の張力変動制御

抄録

A new wire feeding system controlled its tension fluctuation is developed to suppress the vibration of wire electrode in working gap which decreases the accuracy of finishing. The difference of velocity between brake and driving roller with velocity control is measured, and fed to the DC servo motor at the brake to suppress the tension fluctuation of wire feeding system. The dynamical characteristics are analysed as multi-degrees of freedom system and the controller is designed by considering the loop bandwidth and mechanical resonances of the actuator to suppress the tension fluctuation of higher modes. Experiments by using the wire of various diameter are carried out about the wide range of wire feeding speeds, and it is demonstrated that the tension fluctuation can be effectively suppressed by the proposed control method.