The paper treats the results obtained in simultaneous measurements of acoustic emission with PZT AE sensors and of strain with resistance measuring rosettes carried out during and immediately after laser cutting-out of a deep-drawn sheet product, i.e. mud-guard. The presence of a field of residual stresses produced by deep-drawing is characteristic of deep-drawn products. In the course of laser trimming and cutting-out the residual stresses get released, which affects the deformation of the deep-drawn mud-guard concerned. The strain was measured at two measuring points chosen with the resistance measuring rosettes. To describe the changes in the material, acoustic emission was measured at the same points. The two phenomena were then analyzed. A goal of the study presented in this paper was primarily to analyze the sources of acoustic emission present during and immediately after laser cutting. It was found that the main source of acoustic emission during laser cutting was the cutting gas jet. The acoustic emission occurring immediately after cutting of the mud-guard is related to the phenomena in the heat-affected zone of the laser cut and partly to the release of the residual stresses present in the deep-drawn sheet product. The amplitude and the energy of the acoustic emission signals recorded during the cutting process and immediately after cutting, the number of AE hits detected by individual sensor in a unit of time and their cumulative value indicate a significant connection with the phenomena in the material, which may enable optimization of the laser-cutting technology, including the selection of the cutting conditions.


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    Titel :

    Possibility of on-line monitoring of laser cutting of deep-drawn sheet parts by measuring acoustic emission


    Weitere Titelangaben:

    Möglichkeit der On-line-Überwachung des Laserstrahlschneidens tief gezogener Bleche mit Schallemissionsüberwachung


    Beteiligte:
    Grum, J. (Autor:in) / Kek, T. (Autor:in) / Slabe, J.M. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    9 Seiten, 11 Bilder, 7 Tabellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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