关键词: 曲线插补, 交叉耦合控制, 轮廓误差, 补偿修正量, 机床

Abstract: Aiming at the tracking demand of high precision contour, the cross-coupled controller integrated with curve interpolation was studied. According to the real cutter positions from each axis feedback and the interpolation dots stored in the interpolation buffer in every sampling period, a “three-point arc approach” contour error computing model was developed. Moreover, the contour error compensated correction quantity computation and distribution approach was put forward. A cubic Non-Uniform Rational B-Spline Curve(NURBS) profile curve on the numerial control experiment table was tracked. The experiment results showed that the developed contour error cross-coupled control approach based on curve interpolation could effectively reduce contour error and obtain satisfactory contour precision.

Key words: curve interpolation, cross-coupled control, contour error, compensated correction quantity, machinetools