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Commercial aluminium alloys, AA6082 and AA7075, offer high stiffness to density as well as strength to density ratios, and are suitable for structural sheet-metal fabrication. The automotive industry tends to favour these aluminium alloys over steel for a reduction in the weight of components. However, the application of these alloys has been impeded by their poor formability at ambient temperatures. Therefore, a traditional hot stamping technique was employed to form AA6082 and AA7075, to study the springback of a U-Shape workpiece by conducting experiments at varying forming temperatures and forming speeds. It was found that springback was reduced at elevated temperatures compared to that at ambient temperatures, particularly a 16° (90%) reduction for AA7075 component. Increasing forming speed can reduce the level of springback as well, with an observed 15% reduction when comparing slow and fast forming.

This paper reports on the finite element analysis of the warm deep-drawing process of 1vol% CNTs/AZ91D composite sheet. We prepare the simulation with two primary aims, first to have firsthand knowledge of warm deep-drawing process of the composite sheet, second to investigate the dependence of the drawing performance of 1vol% CNTs/AZ91D composite on forming temperature and blank holder force (BHF). Based on this simulation, we study deep-drawing performance of the CNTs/AZ91D composite under different forming temperature and different blank holder force conditions. We found that the composite sheet possess poor drawing performance below the forming temperature of 100 °C. With the increase of temperature, the deep drawing performance improved, and the drawing performance up to the top at 250 °C. In addition, the blank holder force (BHF) of the warm deep-drawing process should be selected from 5 kN to 8 kN for the composite sheet, which has a thickness of 1 mm and diameter of 160 mm.