Evaluation of the possibility of deep drawing of aluminium cylindrical drawpieces from sheets at different relative rolling reductions

Abstract

In the paper, experimental results of research into a multi deep drawing process of cylindrical drawpieces are discussed. The investigations aimed to evaluate of the possibility of deep drawing of aluminium cylindrical drawpieces from sheets and analysis of experimentally obtained changes of forces at different relative rolling reductions. For the purpose of research, EN AW-1050A aluminium blanks with constant diameter and different thicknesses were examined. The material was prepared by longitudinal rolling with different relative rolling reductions (z = 10÷50%) and blanking process. Before deep drawing, some specimens were heat-treated to increase their plasticity. The material was annealed at 300-440°C for a period of 0.3 h. A special stand was utilised during the research. The experimental results on forces and displacements were recorded and processed using a computer stand with Test&Motion software. Selected parameters of the deep drawing process, including forces and limit deformations in four drawing steps, were determined. The results may be used as boundary conditions to perform an in-depth numerical analysis of the deep drawing process of aluminium cups without inter-annealing of material in the course of the production.