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分析了帽形弯曲过程中的弯曲与反弯曲现象，给出了产生弯曲与反弯曲变形所满足的条件，用能量法导出了弯曲力的计算式．
The phenomena of bending and anti-bending during the process of hat bending are analyzed. The conditions for the bending and anti-bending deformation are given. The formula of bending force is deduced by energy method.