Experimental Modelling of the Influence of Boundary Conditions on Kinematics of the Extrusion Process
Abstract
The aim of this paper is to analyses the influence of boundary conditions on plastic flow kinematics during hot extrusion of aluminium alloys. Clay and plasticine have been used as a substitute material. The shape and distribution of a dead zone, conditions of increasing the boundary layers and their influence on flow kinematics have been done using the modelling experiment. Kinematics of plastic flow and especially, range of deformation region allows to predict stresses distribution on contact surface between the die, container and the extruded material.References
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2. S. ERBEL, K. KUCZYŃSKI, Z. MARCINIAK, Plastic working [in Polish], PWN, Warszawa 1986.
3. M.C. FLEMINGS, R. MEHRABIAN, Casting semi-solid metals, AFS Trans., 81, 81, 1973.
4. Y.H. KIM, W.B. BAE, J.R. CHO, J. W. PARK, An experimental study on the non-axisymmetric square die extrusion using model material test, Journal of Materials Processing Technology, 80–81, 653–656, 1998.
5. T.G. NGUYEN, D. FAVIER, M. SUERY, Theoretical and experimental study of the isothermal mechanical behaviour of alloys in the semi-solid state, Int. J. Plasticity, 10, 663, 1994.
6. J. PIWNIK, The modelling of plastic flow processes [in Polish], Wydawnictwa Politechniki Białostockiej, 1992.
7. J. PIWNIK, The mechanics of metal extrusion [in Polish], Wydawnictwa Politechniki Białostockiej, 1991.
8. J. PIWNIK, M. PLATA, The application of the flow function method to predict the normal stress distribution at the die – aluminium interface for large diameter (570 mm) tube extrusion problems, Report, Alusuisse Technology Center, 1996.
9. M. PLATA, J. PIWNIK, Theoretical and experimental analysis of seam weld formation in hot extrusion of aluminium alloys, Report, Alusuisse Technology Center, 2000.
10. M. PLATA, J. PIWNIK, Extrusion of semi-solid aluminium alloys, Report, Alusuisse Technology Center 1996.
11. J.F. SECONDE, M. SUERY, Effect of solidification condition on deformation behaviour of semi-solid Sn-Pb alloys, J. Materials Science, 19, 3995, 1984.
