Surface Quality Prediction in Aluminum Extrusion

Matthijn de Rooij; X. Ma; A.J. den Bakker; Robert J. Werkhoven

doi:10.4028/www.scientific.net/KEM.491.27

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 491Surface Quality Prediction in Aluminum Extrusion

Surface Quality Prediction in Aluminum Extrusion

Abstract:

The surface quality of aluminium extrusion products can be hampered by undesired surface features like die lines and pickups. In particular the presence of pickups is considered as undesirable. Surface pickups appear as intermittent torn marks on the aluminium extrusion products, often terminated with a protruding lump rising above the surface up to hundreds of microns in height. Using a model calculating initiation, growth as well as detachment of the lumps on the die bearing surface, the surface quality of aluminium extrusion products can be predicted. The results of the model can be presented in terms of surface quality diagrams, where contour lines of the (normalized) calculated number of lumps are presented in terms of exit speed and extrudate surface temperature. These diagrams are unique for a certain combination of geometry of the extrudate and the aluminium alloy and can be used to optimise process conditions with respect to surface quality within a certain process window. In order to validate the model, the size and number of pickups on the surface of a labscale extruded strip of AA6063 have been measured. The results of the model are being compared to the experiments and show good agreement.

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Periodical:

Key Engineering Materials (Volume 491)

Pages:

27-34

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.491.27

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Online since:

September 2011

Authors:

Matthijn de Rooij, X. Ma, A.J. den Bakker, Robert J. Werkhoven

Keywords:

AA6063 Aluminum Alloy, Aluminum Extrusion, Modeling, Pickup, Surface Quality

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References

[1] S. Tverlid, Modelling of friction in the bearing channel of dies for extrusion of aluminium sections, (PhD thesis Norwegian University of Science and Technology, Norway 1998).