THE BORING OF NON-CIRCULAR PISTON PINHOLEBASED ON PIEZO VOLTAGE FEEDBACK

摘要

According to the necessity of non-circula r piston pinhole and actuality of machining, a piezoelectricactuator driven micro-displacement mechanism is put forward to achieve the feeding of boring tool. On the basis ofgeometric feature of piston pinhole and the characteristics of piezoelectric actuators, which have infinite resolution,high stiffness and high frequency, a repetitive controller and feed-forward controller in open-loop disturbance channelare introduced into the system based on piezoelectric voltage feedback. As a result, the robustness and trackingprecision of the system are bettered. It’s shown by experiments that 3-micron machining accuracy can be achieved.