“…Simulation by FEM was used to determine energy consumption in forward and backward extrusion of a round section bar [7], to determine friction by a combined forward and backward extrusion test [8], to investigate plastic flow in a forward-backward-radial extrusion process [9], to investigate the lubricating effect of forward extrusion of an AA6063 aluminum alloy [10] or to establish the dependence between damage and the properties of the material in a hybrid forward extrusion process [11]. When performing the finite element analysis, the right choice of software tools [12], the number and type of finite elements, constraints and loads, etc., must be given high importance, so that the numerical data is to be in agreement with the experimental data.…”