关键词: 数控加工, 微线段插补, 曲线过渡, 前瞻控制, 过控制顶点曲线

Abstract:

In order to reduce the velocity fluctuations and realize smoothing transition for machining of micro line segments, an interpolation algorithm was presented based on curve though control points. The curve transition vector model of micro-line segments was constructed. On the basis of geometric characteristics of curve model based on the characteristic polygon vertex, a vector model was proposed based on curve transition through control points. Interpolation of micro-line segments were  calculated by using vector model based on the curve transition according to the machining errors and geometric characteristics of the curve, values of control vertex were calculated, the constraint velocity was determined, and real-time look-ahead control  was processed. The proposed method was evaluated by an experiment, and experimental results demonstrate that the algorithm can effectively improve transition speed of the micro-line segments, shorten the machining time, and achieve smooth transition.

Key words: CNC machining, micro-line interpolation, curve transition, look-ahead control, curve through control points