The Influence of the Blank Holder Force on Material Thinning during Forming of a Rectangular Part Made from Tailor Welded Blanks

The current work deals with numerical simulation connected to forming of a rectangular shaped part made from tailored blanks, having the welding line positioned symmetrical with respect to the part geometry. The objective was to study the relation between the blank holder force applied during forming and the thinning of the parents materials. All the parameters are fixed except the blank holder force, its variation will cause variation of the material thinning. The presented work is trying to demonstrate the important role of the blank holder force on the material thinning during the deep drawing process. 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 on the material thinning. All the parameters are maintained fixed except the blank holder force. The obtained results for five different binder forces (5, 10, 30, 50, 70 kN) 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 blank holder force on the material thinning are presented.