Dynamic explicit finite element analysis of dynamic upsetting process

In order to study the three-dimensional dynamic hammer forging process of metal, a finite element model has been established based on the continuum mechanics and finite deformation theory. A dynamic analysis method was used, and the inertia force was introduced in the equilibrium equation to analyze the inertia effect which is obvious during the hammer forging. According to the operating principle of hammer equipment, the hammer velocity during the deformation process was calculated by the energy balance equation. The temperature rise in the specimen was calculated by the adiabatic principle. With this model, a dynamic explicit finite element analysis code was developed. The dynamic upsetting process of lead block specimen at a drop hammer machine has been simulated. The X-displacement, equivalent strain, equivalent stress and temperature distribution in the specimen were obtained. By comparison between the experimental and calculated deformed geometry, forming load-time curve and hammer velocity-time curve, the accuracy of the calculated results of the code was verified.