Theoretical analysis on springback of L­section extrusion in rotary stretch bending process

The theoretical analysis of springback in rotary stretch bending process of L­section extrusion was studied. The models for characterizing the springback angle after unloading were established based on the stress and strain distributions in the cross­section of the part. With the proposed model, analysis of the effect of pre­stretch force and post­stretch force on springback angle shows that springback decreases as the pre­stretch force or post­stretch force increases. Comparative study with experiments clearly demonstrates that the prediction of springback can resort to the current model without the loss of accuracy.