39 Study on Weld-Line Movement of TWBs with Different Thickness in Hydro-Forming Deep Drawing of Square Cup Available to Purchase

Based on finite element simulation software Dynaform, the influence of process parameters such as blank-holder force (BHF), liquid pressure, gap between die and punch, and friction coefficient on the weld-line movement in hydro-forming deep drawing of square cup using tailor-welded blanks (TWBs) with different thickness has been simulated and investigated. The results show that when Q_b 1Â¥ Q_h in hydro-forming deep drawing, the effect of the pressure difference between thin and thick blank on the weld-line movement is not so much, while the bottom weld-line movement is reduced effectively by controlling the height of equivalent drawbead during pre- bulging, and the weld-line movement of the sidewall is decreased significantly by increasing the liquid pressure in the die cavity. At the same time, forming limit depth can be improved by increasing the gaps between die and punch. The results of this investigation have the practical significance to guide hydro-forming of tailor-welded blanks.