On Improving the Accuracy of Springback Prediction and Die Compensation

In this paper, the factors that affect the accuracy of springback prediction are discussed. Springback predictions of aluminum and high strength steel panels are compared with measurement data. The effect of springback can be reduced or eliminated through process control and die face compensation. The first method involves finding the root causes of springback and eliminating them through process modification. The second method is a direct way to eliminate the springback effect. For large springback with twisting, an incremental compensation is required and the final deviation can be controlled by setting tight convergent tolerance. Stamping production environment can introduce many variables which deviate from engineering condition. The paper shows that material property change within the same grade will cause significant springback variation. This means that the process control is one of the key factors that we have to pay attention to solve springback issue.