The influence of plastic bulk deformation on surface roughness and and frictional behaviour duringdeep drawing processes

H. Lubbinge, R. ter Haar, R. ter Haar, Dirk J. Schipper

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Abstract

In Sheet Metal Forming (SMF) processes, friction does play an important role. This with respect to the increase of product quality demands and the ability of predicting these processes by for instance finite element simulations. The existing simulation models do not contain an adequate friction model. In SMF processes different contact situations can be distinguished. As a result different coefficients of friction are locally present, which influences the forming process. Experiments are performed on a testing device by which it is possible to simulate the operational conditions as present in SMF processes. This test rig is a combination of a tensile tester and a friction measuring device, by which it is possible to measure the coefficient of friction as a function of the operational conditions (velocity and contact pressure) and deformation (elastic or plastic) in a well controlled way. Friction is presented in a generalized Stribeck-curve in which the different lubrication regimes can be distinguished, i.e. Boundary Lubrication (BL) and Mixed Lubrication (ML), which are also occurring during SMF processes. In SMF processes the sheet material deforms elastically and plastically and therefore the surface roughness will change and as a consequence will influence the frictional behavior between sheet and tool. In this paper, the influence of plastic deformation on A) the surface microgeometry and B) as a consequence of that on the frictional behavior of the sheet-tool system is studied. With the aid of a 3D-surface interference microscope, the microgeometry of the deformed material has been analyzed. The result of this investigation is that the CLA-roughness due to the deformation first decreases and then increases with increasing deformation. Furthermore, friction is hardly influenced due to the change in surface roughness. No change in the shape and the level of the generalized Stribeck curve is found.
Original languageUndefined
Title of host publicationProceedings 22th Leeds-Lyon Tribology Conference
EditorsD. Dowson, C.M. Taylor, T.H.C. Childs, G. Dalmaz, Y. Berthier, L. Flamand, J.-M. Georges, A.A. Lubrecht
Place of PublicationLyon, France
PublisherElsevier
Pages705-711
ISBN (Print)0-444-82502-9
DOIs
Publication statusPublished - 13 Feb 1996
Event22nd Leeds-Lyon Symposium on Tribology 1995 - Lyon, France
Duration: 5 Sep 19958 Sep 1995
Conference number: 22

Publication series

NameTribology Series
PublisherElsevier
Volume31

Conference

Conference22nd Leeds-Lyon Symposium on Tribology 1995
CountryFrance
CityLyon
Period5/09/958/09/95

Keywords

  • METIS-145600
  • IR-73246

Cite this

Lubbinge, H., ter Haar, R., ter Haar, R., & Schipper, D. J. (1996). The influence of plastic bulk deformation on surface roughness and and frictional behaviour duringdeep drawing processes. In D. Dowson, C. M. Taylor, T. H. C. Childs, G. Dalmaz, Y. Berthier, L. Flamand, J-M. Georges, ... A. A. Lubrecht (Eds.), Proceedings 22th Leeds-Lyon Tribology Conference (pp. 705-711). (Tribology Series; Vol. 31). Lyon, France: Elsevier. https://doi.org/10.1016/S0167-8922(08)70832-0