Self-Adaptive Dynamic Matrix Control for High-Speed Machining Servo Control

Abstract

The most serious problem that a current high-speed machining (HSM) servo control faces is that when the curve with a "corner" is machined, as the feedrate increases, the cutting accuracy decreases, and over-cutting is much greater than in traditional CNC. The whole accuracy of HSM is thus affected. The problem cannot be solved only by traditional control strategies. Predictive control, which possesses the functionality of predicting the state of the forward path, is a better way to solve the above issue. In this paper, a dynamic matrix control (DMC), whose control algorithm is very simple and easy to implement, is applied to an HSM CNC. A modified DMC control strategy, called self-adaptive PID-DMC control (APDMC), is developed. The aim of this paper is to present this predictive approach and its application for HSM CNC. Simulation and tests prove that APDMC can be applied satisfactorily to HSM CNC.