Prediction method for springback of sheet metal based on material parameter detection

The springback is one of main factors influencing the forming quality of sheet metal,and the accurate prediction and efficient control for the bending springback of sheet metal are the key to improve the precision of bending forming.On the basis of theoretical analysis on both bending forming and springback processes,a bending system applied to free V-bending forming with high precision was developed.Based on the unidirectional strain and small deformation hypothesis,a theoretical model for bending forming and springback was established.The material property parameters were calculated with the bending parameters measured in the forming process,and then the final bending depth was determined.The comparison between the calculated and experimental results verify the feasibility and effectiveness of the proposed method.The method can provide an effective way for the springback control of sheet metal in bending forming process.