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The paper presents the results from experimental studies of combined extrusion of ENAW-1050A alloy parts. The studies were divided into three stages depending on the relative strain value of the material extruded in forward direction, ε1: 0.77, 0.69 and 0.59. For each value of the relative strain ε1, different values of relative strain of material extruded in backward direction were used: ε2= 0.36, 0.46 and 0.58. On this basis, the influence of the relative strain level in the material extruded in forward and backward directions on the die loading force was determined. It was demonstrated that in the combined extrusion, the loading forces on the die increase with the higher levels of relative strain of material extruded in both directions. For combined extrusion, the loading forces are smaller than during the forming of the extrusions in two procedures, where in the first procedure, the cylindrical part is extruded in forward direction and in the other procedure, the sleeve part is extruded in the backward direction. Combined extrusion reduces the effort necessary to manufacture a product and the cost of manufacturing the tools whose durability is additionally enhanced due to lower values of exerted loading force.
Keywords: aluminum, combined extrusion© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.