Experimental study on the influence of sheet temperature and punch speed during blanking of various sheet metal materials

Abstract This experimental study investigates the influence of sheet temperature and punch speed on blanking characteristics for aluminum alloy EN AW-5754, zinc and tin alloys, stainless steel 1.4301, press-hardened steel 22MnB5, and deep drawing grade DC06. Blanking experiments were conducted on a mechanical press. Circular blanks of 20 mm diameter with 5 % clearance were blanked with varied punch speed (0.1 m/s and 0.6–0.7 m/s depending on the sheet thickness) and varied initial sheet temperature (room-temperature, heated 50-80 °C, and cooled 0-(-30) °C). The maximum blanking force, blanking work, fracture shear stress, and the quality of the blanked edge were assessed. Experiments reveal that the sheet temperature has a strong effect on the blanking force. In the tested range, the punch speed primarily affects fracture initiation in steels, but has a negligible impact on non-ferrous alloys.