Deep Drawing of Sphere Using Explosive Forming

Explosive energy can be used in metal forming processes, e.g. for bulk forming, sheet forming and for other processes.This paper presents the experimental research and numerical modelling of the process of sphere deformation by explosive forming.The assembly for forming a sphere with a diameter of 210 mm was welded from flat segments and annealed after welding.The material of the sphere was steel St12 according to DIN 1629/3.The thickness of the sheet metal was 2.0 mm.The sphere was modelled in the SolidWorks program and 3Dprinted with the polylactic acid (PLA) material.The Poladyn 31ECO explosive was used for the experimental investigation into the process of deep drawing of the sphere by explosion, while the LS-DYNA hydrodynamic software was used for simulation.The pressure in the sphere was measured with a pair of copper crushers.It is shown that the simulation satisfactorily reproduces the experimentally measured pressure.