关键词: 样条曲线, 微段, 加减速, 合成速度, 插补, 算法

Abstract: In complex contour machining process with continuous micro-lines mode, machining efficiency was reduced by big fluctuation of composite velocity. To solve this problem, a curve reconstruction micro-line machining algorithm was presented. This algorithm included a new spline which had rapid recursive formula, and a method of velocity planning and recursive interpolation machining algorithm based on this spline. The experiment result showed the algorithm could reduce the situation of frequent acceleration/deceleration and improve the machining efficiency through spline reconstruction and velocity planning on the conditions that ensure continuity of acceleration in machining process. Meantime, computational speed of interpolation was improved by fast recursion, and interpolation point could pass knot of micro line precisely，so machining accuracy was ensured and performance of CNC was promoted.

Key words: spline, micro-line, acceleration/deceleration, composite velocity, interpolation, algorithms