Influence of deformation and roughness on friction in sheet metal forming process

J.D. Westeneng, D.J. Schipper, R. ter Haar

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    It is important to control the friction during Sheet Metal Forming (SMF). Friction measurements have been performed on two apparatus, a SMF-simulator and a reciprocating tribometer. Under controlled conditions tests have been performed on the SMF-simulator to investigate the influence of bulk deformation on the friction. It was found that pre-deformation of the sheet results in an increase of the friction in the mixed lubrication regime compared to no bulk deformation tests. If, however, the coefficient of friction is plotted as a function of the lubrication number used and is adjusted for the increase of roughness and pressure due to straining, the Stribeck curves for the undeformed and the pre-deformed case are exactly the same. However, under conditions of simultaneously sliding and bulk deformation, the corrected value of the coefficient of friction in the mixed lubrication plotted in the Stribeck curve is higher than the one measured in the undeformed case. The coefficient of friction in the other regimes remains the same (the mixed lubrication regime becomes narrower). On both the SMF-simulator as the tribometer the roughness of the tool was varied in order to investigate this influence on the friction in the boundary lubrication regime. For low roughness values friction was independent on roughness. With increasing tool roughness friction increased due to increasing ploughing effects until the number of ploughing asperities on the tool does not increase any more leading again to a constant but higher coefficient of friction.
    Original languageEnglish
    Title of host publicationAUSTRIB '98, Tribology at Work
    Subtitle of host publicationproceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998
    Place of PublicationBarton
    PublisherInstitution of Engineers (Australia)
    Pages531-537
    ISBN (Print)1-86445-001-0
    Publication statusPublished - 9 Dec 1998

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    Metal forming
    Sheet metal
    Surface roughness
    Friction
    Lubrication
    Simulators

    Cite this

    Westeneng, J. D., Schipper, D. J., & ter Haar, R. (1998). Influence of deformation and roughness on friction in sheet metal forming process. In AUSTRIB '98, Tribology at Work: proceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998 (pp. 531-537). Barton: Institution of Engineers (Australia).
    Westeneng, J.D. ; Schipper, D.J. ; ter Haar, R. / Influence of deformation and roughness on friction in sheet metal forming process. AUSTRIB '98, Tribology at Work: proceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998. Barton : Institution of Engineers (Australia), 1998. pp. 531-537
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    abstract = "It is important to control the friction during Sheet Metal Forming (SMF). Friction measurements have been performed on two apparatus, a SMF-simulator and a reciprocating tribometer. Under controlled conditions tests have been performed on the SMF-simulator to investigate the influence of bulk deformation on the friction. It was found that pre-deformation of the sheet results in an increase of the friction in the mixed lubrication regime compared to no bulk deformation tests. If, however, the coefficient of friction is plotted as a function of the lubrication number used and is adjusted for the increase of roughness and pressure due to straining, the Stribeck curves for the undeformed and the pre-deformed case are exactly the same. However, under conditions of simultaneously sliding and bulk deformation, the corrected value of the coefficient of friction in the mixed lubrication plotted in the Stribeck curve is higher than the one measured in the undeformed case. The coefficient of friction in the other regimes remains the same (the mixed lubrication regime becomes narrower). On both the SMF-simulator as the tribometer the roughness of the tool was varied in order to investigate this influence on the friction in the boundary lubrication regime. For low roughness values friction was independent on roughness. With increasing tool roughness friction increased due to increasing ploughing effects until the number of ploughing asperities on the tool does not increase any more leading again to a constant but higher coefficient of friction.",
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    Westeneng, JD, Schipper, DJ & ter Haar, R 1998, Influence of deformation and roughness on friction in sheet metal forming process. in AUSTRIB '98, Tribology at Work: proceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998. Institution of Engineers (Australia), Barton, pp. 531-537.

    Influence of deformation and roughness on friction in sheet metal forming process. / Westeneng, J.D.; Schipper, D.J.; ter Haar, R.

    AUSTRIB '98, Tribology at Work: proceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998. Barton : Institution of Engineers (Australia), 1998. p. 531-537.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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    N2 - It is important to control the friction during Sheet Metal Forming (SMF). Friction measurements have been performed on two apparatus, a SMF-simulator and a reciprocating tribometer. Under controlled conditions tests have been performed on the SMF-simulator to investigate the influence of bulk deformation on the friction. It was found that pre-deformation of the sheet results in an increase of the friction in the mixed lubrication regime compared to no bulk deformation tests. If, however, the coefficient of friction is plotted as a function of the lubrication number used and is adjusted for the increase of roughness and pressure due to straining, the Stribeck curves for the undeformed and the pre-deformed case are exactly the same. However, under conditions of simultaneously sliding and bulk deformation, the corrected value of the coefficient of friction in the mixed lubrication plotted in the Stribeck curve is higher than the one measured in the undeformed case. The coefficient of friction in the other regimes remains the same (the mixed lubrication regime becomes narrower). On both the SMF-simulator as the tribometer the roughness of the tool was varied in order to investigate this influence on the friction in the boundary lubrication regime. For low roughness values friction was independent on roughness. With increasing tool roughness friction increased due to increasing ploughing effects until the number of ploughing asperities on the tool does not increase any more leading again to a constant but higher coefficient of friction.

    AB - It is important to control the friction during Sheet Metal Forming (SMF). Friction measurements have been performed on two apparatus, a SMF-simulator and a reciprocating tribometer. Under controlled conditions tests have been performed on the SMF-simulator to investigate the influence of bulk deformation on the friction. It was found that pre-deformation of the sheet results in an increase of the friction in the mixed lubrication regime compared to no bulk deformation tests. If, however, the coefficient of friction is plotted as a function of the lubrication number used and is adjusted for the increase of roughness and pressure due to straining, the Stribeck curves for the undeformed and the pre-deformed case are exactly the same. However, under conditions of simultaneously sliding and bulk deformation, the corrected value of the coefficient of friction in the mixed lubrication plotted in the Stribeck curve is higher than the one measured in the undeformed case. The coefficient of friction in the other regimes remains the same (the mixed lubrication regime becomes narrower). On both the SMF-simulator as the tribometer the roughness of the tool was varied in order to investigate this influence on the friction in the boundary lubrication regime. For low roughness values friction was independent on roughness. With increasing tool roughness friction increased due to increasing ploughing effects until the number of ploughing asperities on the tool does not increase any more leading again to a constant but higher coefficient of friction.

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    PB - Institution of Engineers (Australia)

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    Westeneng JD, Schipper DJ, ter Haar R. Influence of deformation and roughness on friction in sheet metal forming process. In AUSTRIB '98, Tribology at Work: proceedings of the 5th International Tribology Conference in Australia, Brisbane 6-9 December 1998. Barton: Institution of Engineers (Australia). 1998. p. 531-537