Wall friction coefficient estimation through modelling of powder die pressing experiment

Abstract

Forming of PM components through powder pressing is a process, which is influenced by the friction between the powder and the tool walls. For good performance of the pressing process it is of great interest to understand and estimate the effects of powder–wall friction. However, quantification of the friction coefficient between the powder and the tool is a delicate task. Local contact conditions, such as contact stress, must be measured or otherwise estimated in order to evaluate the coefficient of friction. Here, the friction coefficient is estimated by combining an experiment with modelling of the experiment. Two methods for assessment of friction are presented, an optimisation approach using finite element analyses and an analytical approach. Experimental data are taken from the single action cold pressing of a cylinder shaped component.

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References

Hausner

H. H.

and SHEINHARTZ

: in Proc. 11th Annual Meeting, New York, USA, 1954, Metal Powder Association.

Ernst

and BARNEKOW

: ‘PM ‘94 World Congress on Powder Metallurgy’, Vol. 1, 673–676; 1994, Les Ulis, Les Editions de Physique.

Pavier

and DORÉMUS

: in Proc. International Workshop on ‘Modelling of metal powder forming processes’, Grenoble, France, 1997, Laboratoire Genie Physique et Méchanique des Matériaux, 335-344.

Lindholm

, LARSSON

, and HöGLUND

: in Proc. General Workshop on ‘Modelling in material science and processing’, Davos, Switzerland, 1996, Ecole Polytechnique Fédérale de Lausanne, 308-313.

Wikman

, H.Å. HÄGGBLAD, and M. OLDENBURG: in Proc.International Workshop on ‘Modelling of metal powder forming processes’, Grenoble, France, Laboratoire Genie Physique et Méchanique des Matériaux, 1997, 149–157.

Kim

K. T.

, LEE

H. T.

, and KIM

J. S.

: in Proc. IUTAM Symposium on ‘Mechanics of granular and porous materials’, Cambridge, UK, 1996, Kluwer Academic Publishers, 403-413.

HÖGLUND

and Jacobson

: J. Tribol., 1986, 108, 571–578.

Solimannezhad

and LARSSON

: ‘PM ‘98 World Congress on Powder Metallurgy’, Vol. 2, 120–125; 1998, Shrewsbury, EPMA.

Mair

: Met. Powder Rep., September 1991, 60-64.

10.

Whirley

R. G.

, ENGELMANN

B. E.

, and HALLQUIST

J. O.

: ‘A nonlinear, explicit, two dimensional finite element code for solid mechanics’, User Manual UCRL-MA-110630, Lawrence Livermore National Laboratory, CA, USA, 1990.

11.

Lemaitre

and CHABOCHE

J.-L.

: ‘Mechanics of solid materials’; 1990, Cambridge, Cambridge University Press.

12.

Dimaggio

F. L.

and SANDLER

I. S.

: J. Eng. Mech. Div. ASCE, 1971, 96, 935–950.

13.

Pavier

and DORÉMUS

: in ‘Advances in powder metallurgy and particulate materials’, Vol. 2, 6-27-6-39; 1996, Princeton, NJ, MPIF.

14.

Oldenburg

and HÄGGBLAD

H.Å.

: ‘PM ‘94 World Congress on Powder Metallurgy’, Vol. 1, 693–696; 1994, Les Ulis, Les Editions de Physique.

15.

Wikman

, OLDENBURG

, and H.Å. HÄGGBLAD,: in ‘Simulation of materials processing: theory, methods and applications’, 379-402; 1998, Rotterdam. A. A. Balkema.

16.

Rodic

, GRESOVNIK

, and OWEN

D. R. J.

: in Proc. 4th Int. Conf. on ‘Computational plasticity’, Spain, 1995, 779-787.

17.

Rowan

T. H.

: ‘Functional stability analysis of numerical algorithms’, PhD thesis, University of Texas at Austin, USA, 1990.

18.

HÄGGBLAD

H.Å.

, Dorrmus

, and BOUVARD

: in ‘Advancesin powder metallurgy and particulate materials’, Vol. 2, 7-179-7-192; 1996, Princeton, NJ, MPIF.

19.

Mosbah

, BOUVARD

, LANIER

, OUEDRAOGO

, and STUTZ

: ‘PM ‘94 World Congress on Powder Metallurgy’, Vol. 1, 677–680; 1994, Les Ulis, Les Editions de Physique.