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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2010

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Springback prediction in V-die bending: modelling and experimentation

Osman M. A., Shazly M., El-Mokaddem A., Wifi A. S.

Journal of Achievements in Materials and Manufacturing Engineering

2010

Vol. 38, nr 2

179-186

Purpose: A theoretical model is developed for the air-bending process and V-die bending experiments are conducted. Based on comparisons between springback ratios predicted using the developed theoretical air bending model and the V-die bending experiments, a semi-empirical formula for predicting springback ratio in V-die bending process is suggested. The validity of this formula is verified using finite element simulations as well as comparisons with the results of two other independent sets of experiments. Design/methodology/approach: A theoretical model for air bending is developed and compared with published models. Experimental work on V-die bending is conducted. The experimental results are used in a correlation analysis to develop a mathematical expression for predicting springback ratio of V-die bending as a correction of the spring back ratio of air bending. These results are verified by comparisons with finite element simulations as well as with other independent sets of experiments. Findings: Springback ratios for V-die bending could be predicted using the developed semi-empirical formula. For a given limit of the striking (coining) force, springback ratios are affected by sheet thickness, bend radius, and material parameters. Research limitations/implications: This work suggests a methodology for the prediction of springback ratio in V-die bending. This work can be extended by studying the effect of anisotropy on the developed springback ratio. Practical implications: The developed semi-empirical formula could be practically used in determining the springback ratio for V-die bending. The selection of the sheet thickness and bend radius are critical parameters that affect springback ratios. Originality/value: A semi-empirical formula is suggested for the prediction of springback ratio in V-die bending. This is viewed as a correction of the theoretically predicted air bending springback ratios. This formula could be of help to those working in sheet metal forming industries.