Abstract
The paper deals with optimization of hollow sinking process of seamless steel tube E235. Specifically, the last two sequences are merged into one drawing pass by one tool. Saving one hollow sinking operation will save rebuilding on the drawing bench, tube handling and increase drawing capacity in short time. The input feedstock with outer diameter Ø18 mm and wall thickness 0.9 and 1.0 mm was drawn into tube with final dimension Ø10 × 1.0 mm by single-die and double-die. The aim of the numerical simulations was to compare the flow of material by means of monitored values (stress, deformation) in different technologies. The final drawn tubes differed in wall thickness. This is due to the stress-strain state in the deformation zone. Both simulation and experiment of cold drawing of Ø18 × 0.9 (1.0) mm hollow into Ø10 × 1.0 mm tube confirmed that the double-die configuration is inferior to the single-die one when it comes to the optimum material flow.
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