This paper deals with the optimization of tools geometry in sheet metal forming
U-bending in order to reduce the equivalent strain, equivalent stress, and thickness
change after forming. Free form surface method (Bezier curve, B-spline curve, and
NURBS curve) is used to generate the die and punch profile; this technique is accurate
to describing the die and punch profile. A 3D numerical simulation using the Ansys
12.1 FEM code was conducted to understand the effect of die profile in final product.
The results show that the more uniform distributions in strain, stress, and thickness
when using same profile radius for die and punch (Bezier curve).