Superplastic blow forming with diffusion bonded sheet is an effective forming technology
for the production of multi-cell structures which should have light weight and high stiffness for
aerospace purpose. In the current study, finite element analysis on superplastic blow forming process
has been carried out in order to improve the forming process when manufacturing axi-symmetric
multi-cell structures using diffusion bonded Ti-6Al-4V multi-sheets. The simulation focused on the
reduction of forming time and obtaining finally required shape throughout investigating the
deformation mode of sheet according to the forming conditions, which are diffusion bonding pattern
and die geometry. To reduce forming time, a preforming die was required, and to obtain the final
shape the bonding pattern should be also modified within allowable geometrical margin, so that the
sheet is easy to deform. Moreover, an intermediate simulation result, which was forming pressure
profile, was employed in real forming test to check if the prediction was reasonably on progress. In the
future, a study on the thickness ratio between each sheet should be followed to obtain optimum
process parameters.