Paper Title:
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.

  Info
Periodical
Edited by
Luca Tomesani and Lorenzo Donati
Pages
27-34
DOI
10.4028/www.scientific.net/KEM.491.27
Citation
M.B. de Rooij, X. Ma, A.J. den Bakker, R. J. Werkhoven, "Surface Quality Prediction in Aluminum Extrusion", Key Engineering Materials, Vol. 491, pp. 27-34, 2012
Online since
September 2011
Export
Price
$32.00
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