Influence of Steel Reinforcement Geometry on Position and Embedding
Annika Foydl, Emrah Turan, Andreas Jäger, and A. Erman Tekkaya
Quality in Discontinuously-reinforced, Co-extruded Aluminum Profiles
Institute of Forming Technology and Lightweight Construction,
Technische Universität Dortmund, Dortmund, Germany
Track: EXTRUSION/DIE THEORETICAL - Composites and Nonconventional Materials
ABSTRACT—The process of manufacturing discontinuously non-centric steel reinforced
aluminum by means of co-extrusion has been examined. By this process semi-finished reinforced
profiles can be fabricated for further treatment through forging techniques. The aim of this study
was to examine the influence of the reinforcement shapes on their position in the extrudate and on
the embedding quality. Therefore, steel reinforcement elements, with different shapes, consisting
of steel 1.0035 (cube, two different cylinders, and screw thread), steel 1.0050 (conical cylinder),
and 100Cr6 (sphere) were inserted into conventional aluminum billets and co-extruded into two
solid, round profiles, with diameters of 30 mm and 20 mm and extrusion ratios of 4.8 and 10.9,
respectively. The aluminum alloy used was AA6060. The billet and tool temperature, as well as
the ram speed were kept constant. For the measurement of the position of the reinforcement
elements in the extrudate and the distance between the elements, the extrudates were milled off.
The position is dependent on the starting point in the billet and the length of the elements. The
shape and also the position in the extrudate affect the embedding situation.
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