42nd International Deep Drawing Research Group Conference - IDDRG 2023

In recent decades deep drawing of 5xxx and 6xxx aluminum alloy sheets has increasingly been applied for producing lightweight car body components. Because of frictional heat the surface temperature of the drawing tools may notably increase during series production of these components, even though the deep drawing process is basically performed at room temperature. This work investigates the influence of elevated temperatures on the formability of commercial dry-lubricated 1.5 mm-thick EN AW 5182 and EN AW 6016-T4 sheets. Therefore, deep drawing experiments using a cross-shaped tool were performed at different surface temperatures between room temperature and 100 °C. The results of the experiments revealed that the drawing depth ‒ which can be considered as indicator for the formability ‒ decreases as the temperature of the contact surfaces increases. This trend was confirmed by friction testing using a pin-on-plate tribometer. The results clearly showed that the coefficient of friction (COF) significantly increases at elevated temperatures.