Flange thickness in stretch flanging — accuracy of formed product in axisymmetric stretch flanging of steel sheet I

摘要

Based on experimental results of axisymmetric stretch flanging, the flange thickness does not always decrease monotonically from the die shoulder to the flange edge. Reducing the punch diameter and increasing the flange height significantly reduces the flange thickness, while web width does not affect it. In cases where the punch corner radius is small, the thickness reduction of the flange from the edge becomes greater than that of the flange edge, where as thickness reduction at the die shoulder depends on the die shoulder radius. The thickness reduction at the flange edge is estimated using the calculated values under conditions of circumferential uniaxial tension.