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Numerical analysis of factors influencing springback of U-bending

ZHAO Jun SU Chun-jian GUAN Ying-ping YANG Song (Mechanical Engineering College,Yanshan University,Qinhuangdao 066004,China)  
The main problem in bending process of sheet metal is that it is difficult to control bending springhack accurately. Springback produced from the unloading of bending makes the shape and size incongruent between bending workpiece and working portion of die.The final shape of bending workpiece is related with the whole deformation process,the geometric pa- rameter of die,material performance parameter will have great effect on springbaek.It is the key to the success of intelligent control and the degree of the control precision that confirms well the input and output parameters of the model of real-time i- dentification and prediction in the bending intelligent control system of sheet forming.Using La-dyna software,the factors which effect the springback of U-bending were analyzed to find the main factors.The analysis provided the base for the selec- tion of input and output parameters of the identification and prediction neural network model of intelligent controll of U-bending.
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