Dresden 2006 – scientific programme
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DY: Dynamik und Statistische Physik
DY 25: Granuar Matter and Contact Dynamics I
DY 25.1: Talk
Tuesday, March 28, 2006, 14:30–14:45, SCH 251
3D-Modelling of Powder Flow and Application to Gravity Die Filling — •Claas Bierwisch, Torsten Kraft, Michael Moseler, and Hermann Riedel — Fraunhofer-Institut für Werkstoffmechanik, Wöhlerstraße 11, 79108 Freiburg, Germany
Gravity filling of a cavity (die) via filling shoe movement as used in powder technological molding is investigated by means of three-dimensional discrete element method (DEM) simulations. A homogeneous spatial density distribution of the powder after the filling stage is crucial for the quality of the produced part. Powder properties, filling shoe kinematics, and die geometry influence the density distribution.
The used powder model comprises granular friction and cohesion whereas particle morphology is taken into account by describing the grains as clusters of spherical subunits. This way powders with significant different rheological behavior can be simulated. Powder flow is characterized in terms of the dimensionless Beverloo coefficient C [1] and validated by experimental flow meter data.
Realistic die filling processes including up to 107 particles are studied using a highly parallelized numerical code. Effects of cavity geometry and filling shoe movement on the final density distribution are presented for different powders. Comparisons with die filling experiments [2] will be given.
[1] W. A. Beverloo et al., Chem. Eng. Sci. 15 (1961) 260-269
[2] L. C. R. Schneider et al., Powder Metallurgy 48 (1) (2005) 77-84