Detection of the onset of galling in strip reduction testing using acoustic emission

Marcel Moghadam, Peter Christiansen, Niels Oluf Bay

    Research output: Contribution to journalConference articleResearchpeer-review

    482 Downloads (Pure)

    Abstract

    Galling is an important issue in metal forming of tribologically severe materials such as high strength steel, stainless steel, Al- or Ti-alloys, since it leads to poor surface quality of the formed components, production stops and possibly deterioration of tools. The onset of galling is difficult to detect, since it is either based on the operator's personal judgement or indirect measuring techniques. The application of acoustic emission measuring technique for characterization of onset of galling in sheet metal forming is discussed in the presented paper. The strip reduction test, which emulates the ironing process, has been examined in order to evaluate onset of galling and how this is related to the generated acoustic emission parameters. Preliminary investigations have shown that differences can be found in the acoustic emission signal parameters depending on the frictional conditions between the tool and the workpiece surfaces. A correlation to the severity of galling is found. This is inspected through observations of tested workpiece surfaces in SEM and measurements of the surface roughness. The acoustic emission measuring technique is found to possess promising aspects for online monitoring of galling in metal forming processes.
    Original languageEnglish
    JournalProcedia Engineering
    Volume183
    Pages (from-to)59–64
    ISSN1877-7058
    DOIs
    Publication statusPublished - 2017
    Event17th International Conference on Sheet Metal (SHEMET17) - Palermo, Italy
    Duration: 10 Apr 201712 Apr 2017

    Conference

    Conference17th International Conference on Sheet Metal (SHEMET17)
    Country/TerritoryItaly
    CityPalermo
    Period10/04/201712/04/2017

    Keywords

    • Acoustic emission
    • Strip reduction testing
    • Galling
    • Surface roughness
    • Online monitoring

    Fingerprint

    Dive into the research topics of 'Detection of the onset of galling in strip reduction testing using acoustic emission'. Together they form a unique fingerprint.

    Cite this