【摘要】 通过圆弧测量轨迹,移动球杆仪测量球心在旋转工作台上3个安装位置的9项误差,采用齐次变换理论建立几何误差辨识模型,引入系数矩阵条件数进行安装参数的优化选取,提出一种辨识旋转轴4项位置和6项运动误差的方法。最后,在四轴数控加工中心上进行了测量和验证实验,该方法可辨识出全部的几何误差项,通过对几何误差计算出的预测值和球杆仪的测量值的比较,预测值的绝对误差小于0.003 mm,具有辨识精度高、测量省时的优点。更多还原

【Abstract】 The derivations of the center of the ball installed on the rotary table are measured by double ballbar widi circular paths in the error sensitive directions.Hence,there are nine results measured from three mounting positions of the ball at the same rotation angle,to form four axis location and six motion errors identification model using homogeneous transformation.In addition,the condition number is applied to select the optimum installation parameters of the ballbar.Finally,the measurement and verification experiments are conducted on the four-axis machining center.All the elements of the geometric error can be identified by the proposed method from the measured results with high accuracy and measuring effectively.Then,comparing the predicted value from the identified errors with the measured results by ballbar,it shows that the absolute residual error is less than 0.003 mm.更多还原