Springback effect is predicted quite good and also therefore compensated for. However, it is not 100 % reliable since it depends on sheet metal characteristics. If you can make simple model that accounts for chemical composition variation, processing variations and storing temperature and time it can be useful for stamping producers.
Yes. It is still not fully solved. See you a few recent publications. For example,
Deželak, M., Stepišnik, A., Pahole, I., & Ficko, M. (2013). Experimental and numerical approaches to improve springback prediction and compensation. Journal for Technology of Plasticity, 38(1), 13-21.
Zhang, S., Wu, J. J., & Deng, L. C. (2013). Springback Prediction and Compensation for Thick Freeform Surface Parts Forming. Applied Mechanics and Materials, 271, 498-503.
Liao, J., Xue, X., Zhou, C., Barlat, F., & Gracio, J. (2013). A Semi‐Analytic Model to Predict and Compensate Springback in the 3D Stretch Bending Process. steel research international.
Yang, X. A., & Ruan, F. (2011). A die design method for springback compensation based on displacement adjustment. International Journal of Mechanical Sciences, 53(5), 399-406.
Meinders, T., Burchitz, I. A., Bonte, M. H. A., & Lingbeek, R. A. (2008). Numerical product design: springback prediction, compensation and optimization. International Journal of Machine Tools and Manufacture, 48(5), 499-514.
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