三、夹具定位综合误差方程的建立按图1所示,制件的综合定位误差是由六个定位副的误差所共同引起的。六个定位副的误差所反映的就是三个定位平面的位置误差。即三个定位平面沿三个坐标轴的移动误差和定位平面绕三个坐标轴的转动误差,见图5和图6。△x_o、△y_o、△z_o、△φ、△Ψ、 Third, the fixture positioning the establishment of integrated error equation shown in Figure 1, the workpiece positioning error is caused by the error of the six positioning together. The errors of the six positioning pairs reflect the position errors of the three positioning planes. That is, the movement errors of the three positioning planes along the three coordinate axes and the rotation error of the positioning plane around the three coordinate axes are shown in FIG. 5 and FIG. 6. △ x_o, △ y_o, △ z_o, △ φ, △ Ψ,