Research on effect of technological parameters on the thinning of the sheet metal in hydrostatic forming

Abstract

Hydrostatic forming is one of optimal technologies applied for forming thinshell parts. Using high-pressure fluid to deform sheet metal in accordance with
die cavity profile, this technology is able to manufacture sheet products with
complicated profile by a simple stroke. However, under the action of highpressure fluid, the sheet metal is continuously thinned during forming process.
In this study, Dynaform software was used to investigate the thinning of the
cylindrical parts from DC04 steel material, on three different thicknesses: 0.8,
1.0 and 1.2mm. The simulation results show that the thinning depends much on
the blank holder pressure and the forming fluid pressure. In particular, when the
blank holder pressure increase, forming fluid pressure will rise and the
thinning will grow.