前馈控制方法在非轴对称表面加工中的应用

Feed Forward Controlling Method Used in Non-Axisymmetric Curved Surface Turning

解决非轴对称曲面的车削加工控制中压电陶瓷伺服刀架的滞后问题 ,消除加工中的滞后误差 .在分析压电陶瓷刀具迟滞特点的基础上建立了 3种消除迟滞误差的前馈控制数学模型 ,即 :升压模型、峰值降压模型及任意点降压模型 .用这些数学模型进行补偿加工实验 ,最大位移误差为 0 .0 5μm,补偿前后的加工精度对比表明 ,采用前馈控制补偿的加工方法能够大大降低加工中的迟滞误差 。

In order to eliminate the hysteresis error of piezoceramic servo tool during non axisymmetric curved surface turning, three feedforward controlling mathema tical models have been established, i.e. voltage increasing model, peak voltage dropping model and arbitrary point voltage dropping model. After many feedforward controlling compensation experiments, the maximal displacement error is 0 05 μm. The results of the experiments indicated that the way of compensating the displacement error based on the feedforward controlling mathematical models can lower the hysteresis error greatly during machining, therefore the precision of non axisymmetric curved surface can be improved.