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International Journal of Forming Processes
1292-7775
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 ARTICLE VOL 9/1 - 2006  - pp.79-95  - doi:10.3166/ijfp.9.79-95
TITLE
Traditional Cylinder Compression Analyzed by Help of Internal Stripe Patterns

ABSTRACT
To study material flow of extruded aluminium alloy AA6082 under hot forging conditions cylinders of same diameter but different heights were compressed between heated parallel dies. The cylinders contained a special designed marker material pattern of vertical stripes inside a symmetry plane. After deformation the pattern were revealed and the exact positions of the marker material lines extending into the boundary interface between cylinder and die were measured. The stripe pattern as in initial state of cylinder was set up in simulations using the FEM-code DEFORM. Stripe patterns from simulations and experiments were compared at different stages of compression. The lubricant was a dry powder lubricant added to the dies by means of electro-static attraction. By manipulation of friction in simulation we tried to reproduce the experimental metal flow of the stripe pattern over the die-workpiece interface. In this way, i.e. by inverse modelling, for the lubricant applied in the experiments, we were able to deduce important information regarding friction, the main factor that controls metal flow over the die workpiece interface.


AUTEUR(S)
Dirk NOLTE, Henry VALBERG

KEYWORDS
Metal Forming, Physical Modeling, Internal Grid Pattern, Material Flow, Friction Measurement, Contrast Material.

LANGUE DE L'ARTICLE
Anglais

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