In bottom pressing, or bottoming, the punch presses the workpiece in opposition to The underside surface of a V or U-shaped die, which defines the ultimate bend angle. This technique makes precise bends and decreases the inclination for springback in the workpiece because of the application of increased bending force. https://stephen6vt01.sharebyblog.com/31619888/not-known-details-about-leather-stamping-iron