Numerical investigation of springback effect in draw-bending tests

Résumé

The deep drawn process produces high-strength, lightweight parts more cost-effectively than other methods. Among the advantages offered by deep drawing are rapid press cycle times, fewer operations required to finish a part and the ability to create complex geometries unattainable through other processes. Upon completion or during the sheet metal forming, deep-drawn and stretch-drawn parts springback and thereby affect the dimensional accuracy of a finished part. The final form of a part is changed by springback, which makes it difficult to produce the part. This study considers two draw bending tests (2D draw bending test and 2D drawbeads test) in order to evaluate the effect of springback. The springback parameters will be determined in our study in order to see and then to compare the different springbacks which will appear. The use of draw-beads has provoked a reduction of the maximal punch displacement before the fracture of the DC05 sheet.