In base pressing, or bottoming, the punch presses the workpiece in opposition to The underside floor of the V or U-shaped die, which defines the final bend angle. This process provides precise bends and reduces the inclination for springback in the workpiece because of the appliance of bigger bending force. https://conner2po78.wikikarts.com/1120192/an_unbiased_view_of_stamping_iron_pin