Abstract

According to the necessity of non-circular piston pinhole and actuality of machining, a piezoelectric actuator driven micro-displacement mechanism is put forward to achieve the feeding of boring tool. On the basis of geometric 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 channel are introduced into the system based on piezoelectric voltage feedback. As a result, the robustness and tracking precision of the system are bettered. It's shown by experiments that 3-micron machining accuracy can be achieved.

Paper Details