在用于轮廓加工的数字控制(NC)系统中,刀具在用直线移动来逼近轮廓曲线时,需对位置和进给率进行精确的控制。本文所叙述的控制方案是,刀具能以所希望的斜率产生直线移动。这个方案提供了九段连续的直线移动,所采用的直线段还可扩充,或者在顺序上进行选择以逼近一个轮廓。 In a digital control (NC) system for contouring, the position and feedrate need to be precisely controlled when the tool moves in a straight line to approach the contour curve. The control scheme described in this article is that the tool can generate a linear movement with the desired slope. This solution provides nine consecutive straight-line movements, the straight-line segments used can be expanded, or sequentially selected to approximate a contour.