Reference Trajectory Generation of Laser Beam in Consideration of Response Speed of Laser Processing Machine

Abstract

This paper proposes a reference trajectory generation method to modify laser beam trajectories for laser processing machines using a galvanometer scanner. In the proposed method, inverse dynamics, which are derived by system identification of the galvanometer scanner, i.e., the controlled plant, is used for reference trajectory modification. The modified reference trajectories are implemented to the laser processing machines as common user commands. This allows users to make no change in neither hardware nor firmware to enhance the machine performance that they have already purchased. The validity of the proposed method has been confirmed by experiments using an actual galvanometer scanner system. In the experiments, it has been proved that the proposed method has been achieved a square-shaped processing trace with less deformation than that of no reference modification. Moreover, the proposed method can be used not only for the square shape evaluated in the experiment but also for processing other shapes.