[en] Computer simulation of the combination extrusion process for ENAW-1050A aluminum alloy is presented. The tests were carried out for three values of relative strain in forward direction ε₁: 0.77, 0.69 and 0.59. For each value of relative strain ε₁, three different values of strain in backward direction, ε₂, were taken: 0.41, 0.52, 0.64. The effect of the relative strain degree on the development and values of the punch force was determined. It was demonstrated that the punch force increases with the increasing degree of relative strain in both forward and backward directions. (paper)