Velocity profiles at the outlet of the different designed dies for aluminium extrusion

Abstract

Uniforming of the exit velocities profile in the process of Al-extrusion is a very complex problem, which cannot predict before making and testing the tool. The group of a Russian scientists (G. R. Gun, V. I. Rkovlev, B.A. Prudkovskii ) investigated profile of the exit velocities in laboratory and real production conditions. The investigated pieces were rectangular Al and Pb profiles. The dies were divided on segments because they wanted to measure the differences of the exit velocities in the different parts of the profile. The obtained diagrams present the profile of the exit velocities in every segments of the die. This paper present the comparation between the exit velocities obtained experimentally by the mentioned scientists, and exit velocities obtained numerically with model created by FLUENT. The Al extrusion process is treated as steady state laminar fluid flow with high viscosity. The treated material is aluminum alloy AlMgSi0,5 . The paper shows that there are differences between the exit velocities for segmental and continual exit of the dies.