Cylinder and enlarged blades are used as test models for simulating the leading edge and concave surface of the blade.

用圆柱和放大的叶片做模型，模拟叶片前缘和叶盆凹面的流动。

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The structure plate is composed of high-elastic structure, which is provided with an edge raised line, a middle raised line, a bottom flat surface and a bottom concave surface.

由高弹性结构构成，高弹性结构上设置有边凸条、中凸 条、底平面、底凹面；

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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。

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