Experimental Investigation of Hold Time Effect on Springback in V-Bending Sheet Metal Forming Process

Abstract

Springback is considering as one of the most common problems in metal forming processes, which poses an inaccuracy of product angle during assembling of parts. The estimation of the springback is difficult to predict for formed parts, since it depends on many factors such as the mechanical properties, the sheet thickness and the die angle. In this work, experimental investigation for different thickness and holding time have been studied and analysed. Samples of (Aluminium, brass, and C1004 Steel) specimens with 80 mm length, 50 mm width and 2, 3 and 6mm of thickness selected in this study. Using bending die with angle value (730 and 900) pulled three pieces of each different holding times. Three pieces for each metals were hold with three times (2, 4, 6 minutes). The results show that in a given thickness configuration, the springback reduced with increasing of the punch hold time for all thicknesses selected.