凵形零件展开尺寸确定后,往往在弯形时发现这一展开尺寸过长或过短,因此模具设计人员必须修正展开尺寸,以符合零件弯形后的各段尺寸要求。其实凵形零件测量上存在着相当的差异,由于这一差异而造成对展开尺寸的错判。 以下示零件为例:(各尺寸已化成双向等偏差尺寸,其展开尺寸L_展=105.9±0.175)。 图1中各段尺寸分别是:L_1=38.69、L_2=16、L_3=63.5。 When the 凵 -shaped part is unfolded, it is often found that the unfolded size is too long or too short when it is bent. Therefore, the mold designer must correct the unfolded dimensions to meet the dimensional requirements of each part after bending. In fact, there is a considerable difference between the measurement of 凵-shaped parts, due to this difference caused by the wrong size of the expansion. The following parts as an example: (the size has been turned into two-way deviation size, the expansion of the size L_ exhibition = 105.9 ± 0.175). The dimensions of each section in Figure 1 are: L_1 = 38.69, L_2 = 16, L_3 = 63.5.