Effect of Hole Lancing on the Forming Characteristic of Single Point Incremental Forming

In the single point incremental sheet forming (SPIF) process, the part accuracy and maximum forming angle are limited in comparison with conventional stamping method. The blank sheet boundary is fixed to prevent it from drawing in during the forming process. In addition, the maximum forming angle is reached when the sheet is deformed into critical thickness as described by sine law in the SPIF. This study gives another view on the role of blank shoulder area by hole lancing before forming process. The experiments showed that the hole lancing not only improve the formability but also part accuracy. The springback prediction by artificial neural network (ANN) were performed to clarify the springback dependence on the forming parameters and hole lancing. The 0.8 mm-thick AL5052-O metal sheet was used for all experiments.