Progressive die, more than expected by punching stampings surrounding method to form the shape stamping. Stamping material tumbling, distorting the main reason for the blanking force. Blanking, due to the presence of the blanking gap material in one side of the die by the tensile (material upward warping), relying on a convex mold side is compressed. When the stripper plate, stripper plate pressed material to prevent material upward warping of the die side, the material force status change accordingly. With the stripper plate to its increase in nip force, relying on the punch side of the material under tension (compression force tends to decrease), while the die surface of the material under compression (tensile force tends to decrease). The stampings Flip the die surface material by stretching Erzhi. Punching, press and hold the pressed material to prevent the stamping material tumbling, the focus of the distortions.