抄録
Extrusion pressure and the form of the pressure curve for wrought aluminium alloys were investigated by an automatic recorder on 300 ton extrusion press. Aluminium alloys have a strong tendency to adhere to the working tool and their deformation resistance varies delicately in accordsnce with cooling of the billet. Therefore the initial pressure has a linear relation with the logarithmic extrusion ratio, but the pressure curves for the extrusion by direct and inverted methods into rods or tubes do not show the ideal form. The influence of extrusion speed, temperature and soaking of billet on the extrusion pressure and the form of pressure curve were examined and discussed in connection of the results obtained. The values of resistance of extrusion at 450° for 2S, 3S, 63S, 53S, 61S, 17S, 24S and 52S were measured as 9.39-6.34, 9.86-9.28, 11.8-9,8, 12.9-9.78, 14.5-12.55, 20.7-16.86, 24.2-19, 25 and 23.1-20.95, respectively.
