基于轮廓最优圆逼近方法的轮廓误差控制

设计并实现了基于轮廓最优圆逼近方法的轮廓误差估计模型,该模型克服了常规方法对于任意加工曲线,廓误差计算过程复杂、计算量大、难以应用到实时任务的缺点,通过实时读取数控机床的位置反馈值和插补器的指令数据估算出轮廓误差值,结合双模糊变论域自适应控制算法,应用于两轴数控系统并实时补偿各单轴控制器,实现对复杂加工过程轮廓误差实时估算并补偿。在实验数控机床上加工两种典型轮廓,对比实验表明,所提出的基于轮廓最优圆逼近方法的双模糊变论域轮廓误差控制方法能有效减小加工轮廓误差,有更高的轮廓精度。

Contouring error control based on optimum circular contour approximation method

Based on the optimum circular contour approximation method, we propose a novel estimation model for estimating the contour errors in real time, which overcomes the shortcomings of the conventional methods for free form curves, such as complex approximate calculation of contour error process, huge calculation, and incapability of practical application in real time tasks. The feedback of the feed systems and the interpolation data of the CNC are read and recorded in real time to calculate the contour error vector. The double fuzzy and variable region adaptive control algorithm is applied in biaxial NC systems. Two typical contours are processed in the test machine tool and the comparative experiments show that the double fuzzy control with variable region for contouring error control based on the optimum circular contour approximation method can obtain satisfactory contour precision.