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1·Then experiments on springback in concave and convex edge flanging are carried out, significance of factors and their interactions are studied with statistics approach.

然后开展了凸、凹弧翻边的回弹试验，通过对试验数据的统计分析，得出了各因素及交互作用对回弹量的影响大小。

2·The convex platform at the front edge of the base-plate not only enhances the strength of the base-plate, but avoids clamping stagnation in the process of feeding paper, which is reliable.

底板前缘的凸台既加强了底板的强度，且在送纸时不会产生卡滞现象，使用可靠。

3·A convex rib is arranged on the edge of the clamp groove. The opening end of the main clamping plate is provided with an inclined part.

主夹板的开口端设置有倾斜部，并和副夹板的端口处设置有膨胀导向部。

4·The main knife-edge area is a convex strip-shaped cutting belt, and is used to cut into sheets and threads;

主刀口区是呈凸弧狭条形切割带，用于切片切丝；