Dk. Min et al., A STUDY ON PROCESS IMPROVEMENTS OF MULTISTAGE DEEP-DRAWING BY THE FINITE-ELEMENT METHOD, Journal of materials processing technology, 54(1-4), 1995, pp. 230-238
Multi-stage deep-drawing processes, including normal drawing, reverse
drawing, and redrawing, to shape the front shell of a master VAC for a
n automobile have been analyzed sequentially by the use of the rigid-p
lastic finite-element method, computational results on the punch/die l
oads and thickness distributions being obtained. The thickness strains
were compared with the results of experiments on current drawing proc
esses, good agreement being found. Deep-drawing processes of the redes
igned shell to improve the specific strength and stiffness were simula
ted with the numerical method developed. By varying several process pa
rameters, such as the blank size, the corner radii of the tools, and t
he clearances, the simulation results showed improvements in reducing
the forming loads. Also, forming defects were found during simulation
and the appropriate blank size could be verified.