机身复合加工机床旋转轴定位精度分析与补偿

Position Accuracy Analysis and Compensation of Rotation Axis in Fuselage Compound Machine Tool

为了提高复合加工机床末端执行器旋转轴A的定位精度,首先分析了其摇块机构特性,根据角度位移及变化率曲线得出了误差补偿趋势,使用了分段直线去逼近旋转轴实际运行特性曲线。通过华中HNC 8数控系统双向螺距误差补偿功能,根据测试角度偏差确定螺距补偿值,补偿结果显示能大幅提高旋转轴的定位精度,满足了机床加工精度要求。该旋转轴定位精度分析及螺距误差补偿值改进方法对于采用平面连杆类似结构的数控机床旋转轴提高定位精度,具有一定的参考和应用价值。

In order to improve position accuracy of rotation axis A of end effector in a compound machine tool, the feature of swing block mechanism was analyzed at first, according to the curve of angle displacement and gradient, the trend of error compensation was obtained, subsection lines were used to approach actual operation characteristic curve of rotation axis. According to test angle deviation curve, the pitch angle deviation compensation value was determined by the means of bidirectional pitch error compensation in Huazhong HNC8 CNC system, compensation results showed the positioning precision of the rotation axis was significantly improved, the processing precision requirement of machine tool was also satisfied. The method of position error analysis and screw pitch error compensation improvement of rotation axis has definite reference and application value for improving the position accuracy of rotation axis in CNC machine tool of pla- nar linkage structure.