Entrapment and escape of liquid lubricant in metal forming

Jakob Ilsted Bech, Niels Bay, Morten Eriksen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Using a transparent tool entrapment, compression and eventual escape of liquid lubricant in surface pockets is observed in plane strip drawing. The two mechanisms of lubricant escape. Micro Plasto HydroDynamic and Hydrostatic Lubrication (MPHDL and MPHSL), are observed and quantified experimentally with Varying viscosity, speed, reduction, workpiece material, back tension and friction. The mechanisms are influenced by all these parameters in an explicable way. Theoretical models of the escape mechanisms are established combining continuum mechanic analyses of the die pressure distribution with a fluid mechanic analysis of the lubricant escape. Oscillations in the drawing force are caused by the local escape of lubricant. (C) 1999 Elsevier Science S.A. All rights reserved.
    Original languageEnglish
    JournalWear
    Volume232
    Issue number2
    Pages (from-to)134-139
    ISSN0043-1648
    DOIs
    Publication statusPublished - Oct 1999
    Event8th NORDTRIB Biennial Conference on Fundamental Aspects, Wear, Lubrication, Industrial Tribology and Suface Engineering - Ebeltoft, Denmark
    Duration: 7 Jun 199810 Jun 1998
    Conference number: 8

    Conference

    Conference8th NORDTRIB Biennial Conference on Fundamental Aspects, Wear, Lubrication, Industrial Tribology and Suface Engineering
    Number8
    CountryDenmark
    CityEbeltoft
    Period07/06/199810/06/1998

    Keywords

    • liquid lubrication mechanisms
    • surface pockets
    • friction
    • metal forming

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