关键词: 局部转接, 圆弧曲线, 路径规划, 速度规划, 复杂曲面, 数控加工

Abstract: The complex surface is a type of CNC machining.Before the CNC system is processed,the commercial software will discretize the complex surface into a mass of straight line segments.However,the discontinuity of speed between adjacent straight line segments seriously affects the quality of the curved surface processing,It is often used to insert straight lines or curves between the track segments to improve the continuity of the speed.Based on the algorithm of inserting circular arcs between track segments,a tolerances-based improved circular arc path planning algorithm was proposed,which improved the switching speed while ensuring the precision of transit path.Further,a seven-section S-shaped acceleration/deceleration curve with continuous acceleration and jerk bounded was used to realize tool path speed planning and interpolation.The curve processing verification experiment was carried out based on the above algorithm.The experimental results showed that the proposed algorithm could significantly improve the transition speed between track segments and the processing efficiency of complex curved surface under the same machining accuracy.

Key words: partial transition, arc curves, path planning, feedrate scheduling, complex surface, CNC machining