A real-time and look-ahead interpolation algorithm with axial jerk-smooth transition scheme for computer numerical control machining of micro-line segments

Because micro-line segments are the most widely used form of tool-paths for computer numerical control machining, the smoothness at the junction of two adjacent segments is still the bottleneck for the machining quality and efficiency. To reduce the time spent by the smoothing process and improve the smoothness at the junction, this article proposes a real-time and look-ahead interpolation algorithm with an axial jerk-smooth transition scheme. In one step, the algorithm finishes the transition scheme construction and velocity planning by using the trigonometric velocity planning method. This method can utilize the maximal acceleration and/or jerk capabilities of drive axis to achieve smooth axial kinematic profiles while satisfying the user-specified chord error. In addition, a real-time look-ahead method is developed to plan the global feedrate profile and adjust the transition schemes without intersections constantly. The simulation results demonstrate that the proposed algorithm could realize smooth axial velocity, acceleration and jerk control and improve the smoothing process efficiency and machining accuracy.

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