CNC 공작기계의 고정밀 윤곽가공을 위한 가변 윤곽오차 모델

Abstract

Studies have been conducted on various contour error models applied to cross-coupling control systems, which are essential for achieving contour accuracies in multi-axis CNC systems. Most of these studies examine contour error models for straight, corner, and curved tool paths. However, there are limitations to applying these existing works in multi-axis tool paths because the straight, corner, and curved tool paths may coexist. Therefore, this paper presents a variable contour error model for cross-coupling control systems to achieve high-precision contour machining. The proposed variable contour error model allows real-time changes to the contour error model based on the tool path curvature. The proposed model was evaluated by implementing a cross-coupling control system on a PC-based three-axis CNC testbed. From the experimental results, the usefulness of the proposed model was confirmed in terms of the contour accuracy.