Study the Effect of Extrusion Speed and Die Angle on Relative Extrusion Pressure of Aluminum Alloy AA6061

Theoretical and experimental study of die angle, and extrusion speed effect on relative extrusion pressure of annealed AA6061 aluminum alloy have been carried out in this research. Two theoretical fields have been employed, rigid-plastic field and mixed field, to predict the relative extrusion pressure. A FORTRAN program has been developed to calculate the relative extrusion pressure and its compounds. The tests have been conducted with various, die angle (30°,60°,90°,120°,150°) and various extrusion speed (10,7,3) mm/min. The results showed an increase in shear power and friction power with increasing die angle, while no effect was observed on the internal power of deformation. It was also found that the relative extrusion pressure, the inhomogeneous strain, and the shear strain across the section increase as the die angle and extrusion speed increase. Experimental tests showed that the optimum die angle was 60° while the optimum die angle was between 35°-90° and 46° according to the mixed field and the rigid- plastic field respectively.