Modeling And Experimental Investigation Of Electrohydraulic Forming Of Tube

Electroforming technology is one of the pulse forming process,which can improve the material formability and reduce the springback of the workpiece.It is paid more and more attention in the field of difficult deformation material forming,high precision forming and school forming.This article is based on ANSYS / LS-DYNA program,the electro-hydraulic forming process is simplified as the plasma channel,water,the deformation metal and the surrounding air model,5052 aluminum alloy pipe electroforming process test to verify the acc uracy of the simulation program.When the electrode gap is completely plasmaized,the discharge circuit becomes a typical RLC attenuation oscillation circuit.The energy deposition model in the discharge channel is measured in the process test and the energy input starting point for deformation is determined based on the change in the volta ge across the discharge channel.The plasma discharge channel is defined by the ideal gas model of adiabatic expansion,and the isotropic model is adopted for the deformed tube.The plasma,water and surrounding air grids are defined as ALE multi-material fluid groups,and the deformed materials and dies are Lagrange solid,The numerical simulation and process test of the electroforming of the annealed state 5052 al uminum alloy tube were compared,analyze The characteristics of shock load transfer and pipe deformation,and the characteristics of shock wave load transfer and the law of tube plastic forming were analyzed.The simulation results show that the shock wave load causes the pipe unit to quickly get a great movement speed;The hydrodynamic pressure load distribution is uniform,making the deformation more uniform,while reducing the rebound.Explore the effect of discharge channel position on pipe forming.When placing the wire vertically,reduces the obstruction of the electrode rod to shock wave propagation,improve the energy efficiency,and the stress on the pipe should be more uniform.