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Mult i-layer cellular workpieces are used to manufacture fuel tanks, as well as the external hulls of aircraft. These designs are characterized by low weight and high strength. Monotonic formation with inert gases looks promising for the manufacturing of large workpieces. This article presents an approach to the modeling of energy-force parameters during free forming of titanium alloy workpieces in square dies with shortterm creep. The results of mathematical modeling of the investigated process are given in the form of inequations which allow estimating pressure and critical modes. According to these inequations, we found the influence of the process time on blank’s relative thickness change in various points of its surface, as well as on its height and maximum damage rate change. Keywords— pneumatic forming, deformations, square die, height, thickness.

Analysis of workpiece geometry change during isothermal free deformation of titanium alloys in square die