研究表明不同可控拉深筋路径对盒形件侧壁和凹模圆角部位的应变路径影响不大，而对凸模圆角处的影响较为显著。
The results show that the different CD moving paths have little effect on the strain paths of box sidewall and die corner, which have significant effect on punch corner.
利用灯箱布的凸筋和凹区保证微穿孔不受压变形，保持其良好的 吸声性；
The deformation of the micro-holes can be obviated by arranging ribs and concave regions on the lamp-box fabric so as to keep good sound absorption performance.
下凹的导槽在底板背面形成加强筋，底板 不易变形；
The sunken guide-slot forms rib reinforcement at the backside of the base-plate and the base-plate is hard to deform.
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