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Licensed Unlicensed Requires Authentication Published by De Gruyter June 3, 2013

Flow Balancing in Extrusion Dies for Thermoplastic Profiles

Part I: Automatic Design

  • J. M. Nóbrega , O. S. Carneiro , P. J. Oliveira and F. T. Pinho


To achieve a specified geometry for an extruded profile, together with a minimal degree of internal stresses, flow balancing of the die is required. To attain this objective, the flow along a profile die channel must be accurately described, and this demands a computational code able to predict complex 3D non-isothermal flow patterns. In this work new methodologies for flow balancing are implemented and illustrated. The design code developed to carry out the automatic search of a final geometry consists of an optimisation routine coupled with geometry and mesh generators and a 3D computational code based on the finite volume method. The issues discussed and described here encompass recent developments, namely the implementation of two alternative optimisation algorithms for the automatic search of a final solution, the enhancement of the strategies previously developed to balance the flow, some improvements in the routine used to generate the mesh and the adoption of a progressive mesh refinement technique. The examples show that the proposed methodology performs well and the solution is attained in just a few minutes of calculation without any user intervention during the calculation process.

* Mail address: O. Carneiro, Institute for Polymers and Composites, Department of Polymer Engineering, Universidade do Minho, 4800-058 Guimarães, Portugal

Received: 2002-7-26
Accepted: 2003-3-4
Published Online: 2013-06-03
Published in Print: 2003-09-01

© 2003, Carl Hanser Verlag, Munich

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