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Flow regime analyses during the filling stage in powder metallurgy processes: experimental study and numerical modelling

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Abstract

Experimental and numerical studies of powder flow during the die filling stage in powder metallurgy cold compaction processes are presented. An experimental setting consisting of a horizontal pneumatically activated shoe, a vertical die and high-speed video system has been designed. The experiments show the existence of three flow regimes: continuous, transitory and discrete, which are identified in terms of the particle size, the morphology and the speed of the shoe. In the continuous regime the powder flows in a progressive manner but in the discrete one some perturbations appear as a consequence of a shear band formation that forms discrete avalanches. A numerical model, based on a rate-dependent constitutive model, via a flow formulation, and in the framework of the particle finite element method (PFEM) is also proposed. For the purpose of this study, the use of the PFEM assumes that the powder can be modelled as a continuous medium. The model, provided with the corresponding characterisation of the parameters, is able to capture the two fundamental phenomena observed during the filling process: (1) the irreversibility of most of the deformation experienced by the material and (2) the quick dissipation of the potential gravitatory energy of the granular system through the inter-particle friction processes, modelled by the plastic dissipation associated with the material model. Experimental and numerical results have been compared in order to study the viability of the proposed model.

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Authors and Affiliations

  1. E.T.S. d’Enginyeries Industrial i Aeronàutica de Terrassa, Technical University of Catalonia, C/ Colom, 11, 08222, Terrassa, Spain

    Juan Carlos Cante

  2. Department Ciencia de los Materiales e Ingenieria Metalúrgica, Technical University of Catalonia, Av. Diagonal 647, 08028, Barcelona, Spain

    M. Dolores Riera, Jose Manuel Prado & Alvaro Isturiz

  3. E.T.S. d’Enginyers de Camins, Canals i Ports, Technical University of Catalonia, Edificio C1, Campus Norte, Jordi Girona 1–3, 08034, Barcelona, Spain

    Juan Oliver & C. Gonzalez

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  1. Juan Carlos Cante
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  2. M. Dolores Riera
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  5. Alvaro Isturiz
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  6. C. Gonzalez
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Correspondence to Jose Manuel Prado.

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Cante, J.C., Riera, M.D., Oliver, J. et al. Flow regime analyses during the filling stage in powder metallurgy processes: experimental study and numerical modelling. Granular Matter 13, 79–92 (2011). https://doi.org/10.1007/s10035-010-0225-4

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