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alloy Aluminium analysis approximately billet and container Billet length cm billet profile calculated from Lange's cam discs change in hardness Comparison between hardness container temperature control valve curve decrease deformation loads deformation zone diameter direct extrusion displacement equation exit temperature experimental extrapolated extrusion load extrusion press extrusion speed extrusion temperature factor flow rate friction grain growth hardness and exit hardness increases heat balance heat conduction heat of deformation heat transfer heat transfer coefficient heavy metal increase in hardness initial billet temperature initial hardness Inst Lange Lange's theory length cm Fig linear maximum measured mechanical properties Metallk method mm-2 Flow stress obtained parameters proof stress ram speed relationship shear load shear zone shown in Fig solid solution solidus speed of 0,9 Strain strain-rate Strangpressen structure temper temperature and speed temperature increase temperature of 760°C tensile strength thermal conductivity thermal diffusivity thermocouples through-put tion values