(1) Blank heat treatment deformation, 55 and 12.4 size instability lead to the angle deviation after the clamping.<br>(2) CNI 1 blank size is stable, CNI 4 blank unstable fixture can not be identified.
(1) the angle deviation after clamping is caused by the deformation of blank heat treatment and the size instability of 55 and 12.4.<br>(2) the size of CNI 1 blank is stable, and the unstable fixture of CNI 4 blank cannot be identified.<br>