What is springback in stamping and how is it compensated?

Springback is the elastic recovery of sheet metal after forming, causing the part to deviate from die geometry. It results from residual stresses from plastic deformation and elastic strain recovery. Compensation methods include: Die overbending (designing die to over-form by predicted springback amount), drawbead optimization to control material flow and stress distribution, using restraining forces during unloading, bottoming the draw punch, and material/process modifications. CAE simulation predicts springback enabling die compensation during design. Springback increases with higher material strength (AHSS), making it a significant challenge in lightweight vehicle manufacturing.