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数控机床加工折线时,存在因进给系统反复骤停而加工效率低、加工冲击大等问题.提出折线光滑转接加工优化控制算法,在指定加工误差的条件下,通过引入转接段降低实际转接点附近轨迹精度,从而实现了转接时的速度连续,并给出了转接速度的约束控制条件,对锐角、钝角转接进行了误差分析,验证了控制算法的有效性.针对由直线段和圆弧段组成的连续曲线整体加工控制问题,建立基于S型曲线加减速的加工控制模型,分析了圆弧半径对算法效率的影响.最后针对S型曲线加减速算法中加加速度存在阶跃变化的缺陷,提出了一种加加速度连续的改进算法,从而提高了加工质量.
There are some problems such as low processing efficiency and large processing impact caused by repeated sudden stop of the feeding system when the CNC machine is processing polyline.An optimization control algorithm of polyline smooth transition machining is proposed.With the specified machining error, The accuracy of the trajectory near the transition point is achieved, and the speed of the transition is achieved. The restrained control conditions of the transition speed are given, and the error of acute and obtuse transitions is analyzed to verify the effectiveness of the control algorithm. The whole process control problem of continuous curve consisting of straight line segments and circular arc segments is established, and the machining control model based on S-curve acceleration and deceleration is established, and the effect of arc radius on the algorithm efficiency is analyzed.At last, for acceleration and deceleration of S-curve acceleration algorithm, Step change, an improved algorithm with continuous acceleration is proposed to improve the processing quality.