关键词: 辊弯成形, 回弹, 弯曲方法, 定半径法, 定长度法

Abstract: In order to study the influences of different bending methods on springback in roll forming processes， the effects of different bending methods， fillet radius and sheet thickness on springback were analyzed by combining the experimental method with finite element simulation. The stress and strain distribution in the roll forming processes with different bending methods was analyzed， and the springback mechanism of roll forming was revealed.  The results show that according to the design principles of different bending methods（constant radius method and constant length method）， the differences between the fillet radius and the arc length of different bending sections in the design are the main factor that affect the difference of the stress-strain distribution and springback for the two methods； the springback amount of the constant bend radius method increases with the increase of the number of passes and the increment also rises； the springback of the constant arc length method does not change significantly with the increase of the number of passes， and the amplitude is greater than that of the constant bend radius method； in both bending methods， the springback increases with the increase of fillet radius and decreases with the sheet thickness increase. 

Key words:  , roll forming, springback, bending method, constant bend radius method, constant arc length method