Theoretical predictions and experimental investigation on three stage hemispherical dome in superplastic forming process

Abstract

Superplastic blow-forming technique is one of the fastest manufacturing methods for producing complicated components in automobile industries. The uniform thickness distribution where obtain in a multiple geometry component is a common problem during superplastic forming process. To prevail over this, a more than two stage superplastic forming process has been attempted using a three-step hemispherical die to form a cup-shaped 5083 aluminium alloy sheets. The superplastic forming process (SFP) parameters like thickness profile, forming time, optimum pressure, dome height and temperature were measured experimentally. Theoretical models and computational using the finite element code (ABAQUS) have been developed and validated with experimental results. Thin profile was obtained at the minimum forming time and optimum forming pressure.