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Surface Flattening and Nanostructuring of Steel by Picosecond Pulsed Laser Irradiation

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Abstract

Steel is used as a mold material for press/injection molding of plastic products. High accuracy and releasing ability are required for a steel mold surface. This paper proposes a surface finishing method for steel molds by using picosecond pulsed laser irradiation. The process involves two steps: one is surface flattening by removing the surface asperity through laser ablation, and the other is forming nanoscale laser-induced periodic surface structures (LIPSS) on the flattened surface. The two steps are realized by using the same laser at controlled laser fluence and focus position. Experimental results showed that LIPSS was successfully formed after surface flattening under specific ranges of laser fluence and defocus length. Furthermore, plastic forming experiments demonstrated that a steel surface with LIPSS significantly decreased the effective contact area and, in turn, reduced the mold releasing force. These findings provide the possibility of fabricating high-performance steel molds by picosecond pulsed laser irradiation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1 Kohoku, Yokohama, Kanagawa, 223-8522, Japan

    Tomoki Kobayashi & Jiwang Yan

  2. Yazaki Corporation, Hikarinooka 3-1, Yokosuka, Kanagawa, 239-0847, Japan

    Hiroshi Sera & Tomohiro Wakabayashi

  3. Optoquest Co., Ltd, Haraiti 1335, Ageo, Saitama, 362-0021, Japan

    Haruyuki Endo & Yuichi Takushima

Authors
  1. Tomoki Kobayashi
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  2. Hiroshi Sera
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  3. Tomohiro Wakabayashi
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  4. Haruyuki Endo
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  5. Yuichi Takushima
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  6. Jiwang Yan
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Correspondence to Jiwang Yan.

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Kobayashi, T., Sera, H., Wakabayashi, T. et al. Surface Flattening and Nanostructuring of Steel by Picosecond Pulsed Laser Irradiation. Nanomanuf Metrol 1, 217–224 (2018). https://doi.org/10.1007/s41871-018-0023-x

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  • DOI: https://doi.org/10.1007/s41871-018-0023-x

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