Research on cubic polynomial acceleration and deceleration control model for high speed NC machining

摘要

To satisfy the need of high speed NC (numerical control) machining, an acceleration and deceleration (ace/dec) control model is proposed, and the speed curve is also constructed by the cubic polynomial. The proposed control model provides continuity of acceleration, which avoids the intense vibration in high speed NC machining. Based on the discrete characteristic of the data sampling interpolation, the ace/dec control discrete mathematical model is also set up and the discrete expression of the theoretical deceleration length is obtained furthermore. Aiming at the question of hardly predetermining the deceleration point in ace/dec control before interpolation, the adaptive ace/dec control algorithm is deduced from the expressions of the theoreticaldeceleration length. The experimental result proves that the ace/dec control model has the characteristic of easy implementation, stable movement and low impact. The model has been applied in multi-axes high speed micro fabrication machining successfully.