Paper Title:
Simulation of Porthole Die Extrusion Process Comparing NEM and FEM Modelling
  Abstract

Porthole die extrusion is a process typology that can give great advantages in the forming processes. Due to the complexity of the die assembly, experimental analyses are often carried out in order to investigate the parameter influence on the quality of the final parts. Finite Element Analyses, however, have been often used for the cost reducing and for a better local investigation of variables like pressure and effective stress inside the welding chamber. In spite of that, up to now, commercial FE codes present a “structural” limit during the welding phase due to the impossibility to simulate element joining when material reaches the required process conditions. From this point of view, the Natural Element Method (NEM) provides significant advantages; in fact, the meshless characteristic of NEM is “natively” able to simulate joining of free surfaces, as it occurs during porthole die extrusion, simulating the welding line formation inside the welding chamber. In this paper, using experimental tests recognizable in literature, the authors tried to validate the effectiveness of this technique; moreover, even a comparison between NEM and FEM results was carried out. More in detail, different geometries of the welding chamber were analyzed; in some cases, the process conditions were suitable to guarantee material welding while, in other cases, the material came out from the porthole die without joint formation. The variable that was used to verify the process goodness is the maximum pressure inside the welding chamber. Furthermore, to evaluate the effectiveness of 2D analyses, even in a complex shape, a significant section was extrapolated for each die, performing a NEM vs. FEM assessment of the results. A good comparison was obtained between the two different methods that, moreover, were in agreement with the experimental tests.

  Info
Periodical
Edited by
A. Erman Tekkaya and Nooman Ben Khalifa
Pages
97-104
DOI
10.4028/www.scientific.net/KEM.424.97
Citation
I. Alfaro, F. Gagliardi, E. Cueto, L. Filice, F. Chinesta, "Simulation of Porthole Die Extrusion Process Comparing NEM and FEM Modelling", Key Engineering Materials, Vol. 424, pp. 97-104, 2010
Online since
December 2009
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Francesco Gagliardi, I. Alfaro, Luigino Filice, E. Cueto
Abstract:The conventional tube extrusion process has been substituted by porthole die extrusion due to relevant advantages in terms of productivity...
151
Authors: Hong Chang Qu, Yuan Xin Li, Ling Ling Chen
Chapter 1: Materials Science and Engineering
Abstract:A meshless natural neighbour Petrov–Galerkin method (NNPG) is presented for solving the elasticity problems in this paper. In a certain...
458
Authors: Martin Schwane, Thomas Kloppenborg, Andreas Reeb, Nooman Ben Khalifa, Alexander Brosius, Kay André Weidenmann, A. Erman Tekkaya
Extrusion and Drawing
Abstract:The accurate simulation and the optimization of extrusion processes can be a helpful technique to ensure producibility of complex aluminum...
517
Authors: Dao Hong Ding, Qing Zhang, Jiang Qing Xiao
Chapter 1: Structural Engineering
Abstract:Based on the Voronoi diagram of some nodes, the natural element method (NEM) constructs the shape functions by the natural neighbor...
93
Authors: Diego Canales, Elias Cueto, Eric Feulvarch, Francisco Chinesta
Chapter 5: Multiscale & Continuum Constitutive Modelling
Abstract:Friction Stir Welding (FSW) is a welding technique the more and more demanded in industry by its multiple advantages. Despite its wide use,...
513