Fundamentals of Advanced Aluminum Extrusion Processes
Józef Zasadziński, Wojciech Libura, Jan Richert, AGH University of Science and Technology, Krakow
Track: DIE DESIGN AND TECHNOLOGY - Surface Treatments and Materials
ABSTRACT --- This paper describes industrial tests aimed at improving existing
aluminum hot extrusion processes. The influence of so-called convex dies on material
structure and mechanical properties of extruded profiles is investigated. More uniform
microstructure and hardness distribution on the profile cross-section extruded through
the convex die of proper geometry was found, compared to the standard flat die. An
effect of direct cooling of extruded profiles by liquid nitrogen on the quality of their
surface was investigated, confirming that this technique can be successfully used. The
process efficiency and surface quality of the profiles can be improved using dies with
bearing lengths covered with a nitride layer. Efficiency of the nitride coatings on these
bearings has been practically confirmed for over 2000 billets from the 6000 alloys. In a
summary guidelines for developing advanced techniques of hot extrusion of aluminum
alloys is presented.
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