The Influence of the Punch Speed on the Welding Line Movement during Deep Drawing in Case of Tailor Welding Blanks

Abstract

The work presented in this paper refers to numerical simulation related to deep drawing of three parts having different geometry, as follows: square shape, cylindrical shape and semispherical shape. The current paper is trying to prove out the important role of the punch speed on the welding line displacement during the forming process. The punch speed influence is testes for the fallowing values: 100, 300, 600, 800 and 1000 mm/s. The punch stroke is 25 mm, which is the safe drawing depth for all three selected shapes. The parts are made from tailor welded blanks, having the welding line positioned as axis of symmetry. It must be mentioned that both materials from the welded structure are having the same thickness (1mm). The Dynaform 5.8.1 software is used to simulate the forming process. The part obtained after each simulation is analyzed and measured to quantify the displacement of the welding line. The welding line behave differently for each tested punch speed and also for each part shape. All the parameters are maintained fixed except the punch speed. The obtained results for those three shapes were compared to realise the behaviour of the tailor welded blanks during deep drawing process. In the final part of this paper conclusions regarding the influence of the punch speed and of the part shape on the welding line movements are presented.