Numerical and Experimental Study on Hydrodynamic Deep Drawing of Hemispherical Cups.

In this research, the production of a hemispherical cup by hydrodynamic deep drawing was investigated by using finite element simulation and experimental works. The aim was to study the effect of the liquid pressure on the cup thickness distribution and dimensional accuracy. For this purpose, plain carbon steel sheet with 0.8mm thickness and 80mm diameter was used as a blank. The punch diameter was 40mm and motor oil SAE20w50 was used as a pressure medium. The finite element code ABAQUS/Explicit 6.8 was used to simulate the process. Due to symmetry, only quarter of the die and sheet were modeled. The liquid pressure was modeled by applying an extended load onthe blank. VDLOAD subroutine was used to control the pressure variation during the process. Moreover, the pressure path was studied mathematically. There was an acceptable agreement between the experimental results and finite element analysis. The results indicated that there is an optimum pressure which the thickness uniformity and the wall dimensional accuracy of the cup is improved. [ABSTRACT FROM AUTHOR]