Through comparison and analysis of the 25U steel actual curvature radius before and after bending spring-back with the numerical computation results by theoretical formula, the results show that, when the bend radius of 25U steel was greater than 1 000 nun, along with the bending radius decreased, the corresponding amount of resilience increased, and between the bending radius before spring-back and the results of theory formula, there was very large error existed. When the bending radius was less than 1 000 mm, with the bending radius decreased, the corresponding changes in resilience were not significant, and the error between the ben ding radius and the theoretical result was smaller. Practical applications were mainly to 1 000 -2 500 mm radius of curvature, hence amendment was needed to the theoretical formula of the profile within this range. The results of amended formula are in consistent with the experimental data. It can be used to calculate the 25 U steel processing amount of control equipment and to supervise practical pro duction.%通过对25U型钢弯曲回弹前后实际曲率半径与型材弯曲理论公式数值计算结果的对比、分析,结果表明:25U型钢在弯曲半径大于1 000 mm时,随着弯曲半径的减小,所对应回弹量增大,回弹前的弯曲半径与型材弯曲理论公式数值计算结果之间存在很大的误差；当弯曲半径小于1 000 mm时,随着弯曲半径的减小,所对应回弹量变化不大,并且与型材弯曲理论公式数值计算结果之间的误差较小.实际应用中以1 000 ～2 500 mm曲率半径为主,因此需在这一范围内对型材弯曲理论公式进行修正,修正后的型材弯曲理论公式数值计算结果与实验值相吻合,可以用于计算25U型钢加工设备的控制量,指导实际生产.
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