モデルマッチング法を用いた数値制御工作機械送り駆動系の多軸制御

概要

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This paper presents a multi-axis control method using a model matching method for feed-drive systems of CNC machine tools. The servo system of each axis of a machine tool is independently tuned up. We try to tune up a machine tool matching Y-axis to X-axis. In machine tools the X-axis is usually mounted on the Y-axis, and the Y-axis has larger mass and lower natural frequency than the X-axis. Therefore, the Y-axis yields resonance or overshoot. In circular motion using P control, when proportional gains of X and Y axes are different, the circular trajectories generally become an ellipse. In order to solve these problems and to improve the accuracy of machine tools, this study proposes a multi-axis control method applied a feedforward compensator to a feedback compensator based on P control and a feedforward compensator designed using the model macthing method. Experimental results show that proposed feed-drive systems have good performance in cornering and circular motions.
1999-05-05