Surface design and texturing of strip steel using nanosecond pulsed lasers for simulated roughness transfer and paint appearance

Eva Rodriguez-Vidal*, David Thomas Allan Matthews, Virginia Saenz de Viteri, Frank Korver, D.J. Wentink, Iban Quintana

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    The final surface topography of flat sheet (galvanized) products is achieved using textured rolls during the skin-pass process. The topography is generally applied to improve the surface functionality of the sheets obtained, or reduce downstream environmental effects. This work analyzes the short-pulse laser texturing technique as an technology to improve a key functionality of galvanized metal sheets for the automotive sector: the paint appearance. For this purpose, deterministic patterns were selected from theoretical methods and produced on imprinting dies by nanosecond pulsed laser processing. The pulsed laser texturing technique has been shown to be highly controllable with suitable reproducibility and surface characteristics in terms of roughness (Ra), peak count (RPc) and waviness (Wa) values, as main factors connected to the desired paint appearance functionality. The roughness transfer capability during the skin-pass process was assessed by normal loading compression tests for different contact pressures and sheet materials. Additionally, the painting process applied in the production chain of automotive parts were reproduced at lab scale, following by the waviness and roughness characterization and validation of the topographic designs proposed. Experimental results show a strong dependence of transfer capability of textures as function of mechanical properties of the metal sheets. For the considered deterministic patterns meaningful differences in terms of transfer capability of Ra and Rpc to steel strip were found as function of the pattern topography reaching maximum transfer capability of 60% and 130% for Ra and Rpc respectively, for contact pressure range between 250 MPa and 500 MPa, corresponding to maximum absolute values of Ra = 1.5 μm and Rpc = 190 cm-1 on the steel strip. Concerning waviness, results revealed a significant decrease of waviness over all length scales considering Rpc>75cm-1 and 0.7 μm < Ra<1.5 μm, which involves an enlargement of the current process window with respect to current Electro Discharge Texturing process.
    Original languageEnglish
    Article number116365
    JournalJournal of materials processing technology
    Volume275
    Early online date16 Aug 2019
    DOIs
    Publication statusPublished - 1 Jan 2020

    Fingerprint

    Texturing
    Steel
    Pulsed lasers
    Paint
    Surface roughness
    Sheet metal
    Topography
    Galvanized metal
    Skin
    Painting
    Surface topography
    Environmental impact
    Laser pulses
    Compaction
    Textures
    Mechanical properties
    Processing

    Keywords

    • laser texturing
    • paint appearance
    • nanosecond pulses
    • roughness transfer
    • surface topography

    Cite this

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    title = "Surface design and texturing of strip steel using nanosecond pulsed lasers for simulated roughness transfer and paint appearance",
    abstract = "The final surface topography of flat sheet (galvanized) products is achieved using textured rolls during the skin-pass process. The topography is generally applied to improve the surface functionality of the sheets obtained, or reduce downstream environmental effects. This work analyzes the short-pulse laser texturing technique as an technology to improve a key functionality of galvanized metal sheets for the automotive sector: the paint appearance. For this purpose, deterministic patterns were selected from theoretical methods and produced on imprinting dies by nanosecond pulsed laser processing. The pulsed laser texturing technique has been shown to be highly controllable with suitable reproducibility and surface characteristics in terms of roughness (Ra), peak count (RPc) and waviness (Wa) values, as main factors connected to the desired paint appearance functionality. The roughness transfer capability during the skin-pass process was assessed by normal loading compression tests for different contact pressures and sheet materials. Additionally, the painting process applied in the production chain of automotive parts were reproduced at lab scale, following by the waviness and roughness characterization and validation of the topographic designs proposed. Experimental results show a strong dependence of transfer capability of textures as function of mechanical properties of the metal sheets. For the considered deterministic patterns meaningful differences in terms of transfer capability of Ra and Rpc to steel strip were found as function of the pattern topography reaching maximum transfer capability of 60{\%} and 130{\%} for Ra and Rpc respectively, for contact pressure range between 250 MPa and 500 MPa, corresponding to maximum absolute values of Ra = 1.5 μm and Rpc = 190 cm-1 on the steel strip. Concerning waviness, results revealed a significant decrease of waviness over all length scales considering Rpc>75cm-1 and 0.7 μm < Ra<1.5 μm, which involves an enlargement of the current process window with respect to current Electro Discharge Texturing process.",
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    author = "Eva Rodriguez-Vidal and Matthews, {David Thomas Allan} and {Saenz de Viteri}, Virginia and Frank Korver and D.J. Wentink and Iban Quintana",
    year = "2020",
    month = "1",
    day = "1",
    doi = "10.1016/j.jmatprotec.2019.116365",
    language = "English",
    volume = "275",
    journal = "Journal of materials processing technology",
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    Surface design and texturing of strip steel using nanosecond pulsed lasers for simulated roughness transfer and paint appearance. / Rodriguez-Vidal, Eva; Matthews, David Thomas Allan; Saenz de Viteri, Virginia; Korver, Frank; Wentink, D.J. ; Quintana, Iban.

    In: Journal of materials processing technology, Vol. 275, 116365, 01.01.2020.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - Surface design and texturing of strip steel using nanosecond pulsed lasers for simulated roughness transfer and paint appearance

    AU - Rodriguez-Vidal, Eva

    AU - Matthews, David Thomas Allan

    AU - Saenz de Viteri, Virginia

    AU - Korver, Frank

    AU - Wentink, D.J.

    AU - Quintana, Iban

    PY - 2020/1/1

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    N2 - The final surface topography of flat sheet (galvanized) products is achieved using textured rolls during the skin-pass process. The topography is generally applied to improve the surface functionality of the sheets obtained, or reduce downstream environmental effects. This work analyzes the short-pulse laser texturing technique as an technology to improve a key functionality of galvanized metal sheets for the automotive sector: the paint appearance. For this purpose, deterministic patterns were selected from theoretical methods and produced on imprinting dies by nanosecond pulsed laser processing. The pulsed laser texturing technique has been shown to be highly controllable with suitable reproducibility and surface characteristics in terms of roughness (Ra), peak count (RPc) and waviness (Wa) values, as main factors connected to the desired paint appearance functionality. The roughness transfer capability during the skin-pass process was assessed by normal loading compression tests for different contact pressures and sheet materials. Additionally, the painting process applied in the production chain of automotive parts were reproduced at lab scale, following by the waviness and roughness characterization and validation of the topographic designs proposed. Experimental results show a strong dependence of transfer capability of textures as function of mechanical properties of the metal sheets. For the considered deterministic patterns meaningful differences in terms of transfer capability of Ra and Rpc to steel strip were found as function of the pattern topography reaching maximum transfer capability of 60% and 130% for Ra and Rpc respectively, for contact pressure range between 250 MPa and 500 MPa, corresponding to maximum absolute values of Ra = 1.5 μm and Rpc = 190 cm-1 on the steel strip. Concerning waviness, results revealed a significant decrease of waviness over all length scales considering Rpc>75cm-1 and 0.7 μm < Ra<1.5 μm, which involves an enlargement of the current process window with respect to current Electro Discharge Texturing process.

    AB - The final surface topography of flat sheet (galvanized) products is achieved using textured rolls during the skin-pass process. The topography is generally applied to improve the surface functionality of the sheets obtained, or reduce downstream environmental effects. This work analyzes the short-pulse laser texturing technique as an technology to improve a key functionality of galvanized metal sheets for the automotive sector: the paint appearance. For this purpose, deterministic patterns were selected from theoretical methods and produced on imprinting dies by nanosecond pulsed laser processing. The pulsed laser texturing technique has been shown to be highly controllable with suitable reproducibility and surface characteristics in terms of roughness (Ra), peak count (RPc) and waviness (Wa) values, as main factors connected to the desired paint appearance functionality. The roughness transfer capability during the skin-pass process was assessed by normal loading compression tests for different contact pressures and sheet materials. Additionally, the painting process applied in the production chain of automotive parts were reproduced at lab scale, following by the waviness and roughness characterization and validation of the topographic designs proposed. Experimental results show a strong dependence of transfer capability of textures as function of mechanical properties of the metal sheets. For the considered deterministic patterns meaningful differences in terms of transfer capability of Ra and Rpc to steel strip were found as function of the pattern topography reaching maximum transfer capability of 60% and 130% for Ra and Rpc respectively, for contact pressure range between 250 MPa and 500 MPa, corresponding to maximum absolute values of Ra = 1.5 μm and Rpc = 190 cm-1 on the steel strip. Concerning waviness, results revealed a significant decrease of waviness over all length scales considering Rpc>75cm-1 and 0.7 μm < Ra<1.5 μm, which involves an enlargement of the current process window with respect to current Electro Discharge Texturing process.

    KW - laser texturing

    KW - paint appearance

    KW - nanosecond pulses

    KW - roughness transfer

    KW - surface topography

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    DO - 10.1016/j.jmatprotec.2019.116365

    M3 - Article

    VL - 275

    JO - Journal of materials processing technology

    JF - Journal of materials processing technology

    SN - 0924-0136

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    ER -