By A Erman Tekkaya; Nooman Ben Khalifa
Read or Download Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 PDF
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Extra resources for Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009
8). At the end of the trials the die was cleaned by aluminum by means of caustic soda bath and no permanent deflection of the tongue was found. Fig. 8: Deformation of the less supported inner profile contour and curved profile geometry In order to analyze the influence of the die deflection on the profile geometry more extrusions were carried out without guiding the exiting profiles. In these experiments, the profile exiting from the less supported part of the die came out in a pronounced curve (Fig.
4). The cast billet shows a dendritic structure with large grains with a mean size of 80µm and mainly primary Mg2Si and AlFeSi precipitations. Prior to hot forming processes commonly a homogenization treatment is performed. It can be clearly seen that the plate like particles spheroidize during the homogenization at 540°C for 3 hours (Fig. 4b), which guarantees better forming conditions. After extruding the aluminium at 500°C billet temperature, two different post treatment conditions for the extruded material were compared to investigate the influence of static recrystallization.
In contrast to refinement, remeshing does not change the element density in the new mesh. This means less interpolation of the result is required and therefore the accuracy of the final solution will be higher. Realistic boundary conditions such as friction and thermal contact have a significant influence on the deformation of material and on the evolution of microstructure parameters during the simulation of the extrusion process. The heat transfer between the contacted surfaces is modeled as , where is the gap conductance between two surfaces and The gap conductance can be defined as , (4) and are the surface temperatures.
Advances on hot extrusion and simulation of light alloys : selected, peer reviewed papers from the International Conference on Extrusion and Benchmark (ICEB), Dortmund 2009, Germany, September 16.-17. 2009 by A Erman Tekkaya; Nooman Ben Khalifa