Experimental and numerical investigation of the springback behaviour of CP800 sheet after the V-bending process

Abstract

Springback plays a key role in the geometrical and dimensional integrity of the product obtained in metal forming. This study investigated the formability of high-strength complex phase CP800 sheet under V-bending at room temperature. The experiments were carried out on 2.5-mm-thick material using parameters of four different bending angles, three different punch radii and two different holding times. The effects of selected parameters on springback were investigated both experimentally and via finite element analysis (FEA). As a result of the study, it was determined that the amount of springback decreased as the die angle (α) increased and increased as the punch radius (r) increased, and that the effect of the holding time remained limited. In addition, the damage was observed in the bending samples obtained under experimental conditions of α = 60° and r = 2 mm. The experimental and simulation findings showed that the measured angles (β) were in good agreement (>95%).