Abstract
To achieve the desired bending radius and degrees during bending process, over-bending with precision amount is necessary to eliminate the manufacturing error caused by spring back. Researches of prediction of spring back are mostly based on the assumptions of linear elasticity and exponential plasticity, which can not be applied on copper sufficiently because of its special stress-strain characteristics. In this study, a calculating method which is derived from the expansion of the elastic beam theory has been established, and spring back prediction is carried out by simple calculation. The prediction accuracy is verified with experiments and simulations of rectangular-copper-bar bending. The prediction error showed that the standard deviation was 6.9%.
