A Smooth Transition Algorithm Between Track Segments in CNC Machining

Abstract

The complex surface is the most common surface form in the numerical control process. In the numerical control system, the complex surface is often approached by a continuous straight segment, but the speed discontinuity between adjacent straight segments seriously affects the surface processing quality, thus often being used between track segments. Inserting a straight line or curve improves the speed continuity. This paper proposes an improved circular arc path planning algorithm based on the allowable error in the existing arc transfer algorithm, which can improve the transfer trajectory while ensuring the accuracy of the transfer trajectory. At the same time, based on the flexible acceleration and deceleration control method, a seven-section S-shaped acceleration/deceleration curve with continuous acceleration and jerk bounded is used in this paper to implement tool path speed planning and interpolation. The experimental results show that the proposed algorithm can significantly improve the transition speed between the track segments and improve the processing efficiency of complex curved surfaces under the same processing accuracy.