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Development of Laser Hardening Method for Convex and Concave Corners by Optimally Shaped Spatial Intensity Distribution by High-speed Laser Scanning

Research Project

Project/Area Number 19K04116
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18020:Manufacturing and production engineering-related
Research InstitutionRyukoku University

Principal Investigator

Ogawa Keiji  龍谷大学, 先端理工学部, 教授 (80405232)

Co-Investigator(Kenkyū-buntansha) 田邉 裕貴  滋賀県立大学, 工学部, 教授 (00275174)
Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsレーザ / 空間強度分布 / 焼入れ / 硬度分布 / 高精度 / 機械工作・生産工学 / 精密部品加工 / 材料加工・処理
Outline of Research at the Start

隅角部に所定深さ以上の硬化領域を形成するために、熱シミュレーションを用いて、隅角部形状及び寸法に応じた適正なレーザ照射法を迅速に導出するシステムを開発する。さらに、そのために、小スポットレーザをガルバノミラーにより超高速重畳スキャンすることで、疑似的に任意の空間強度分布を有するレーザビームを成形し、これを熱源とする新しいレーザ焼入れ技術を確立する。そして、本技術の環境負荷低減効果を明らかにする。

Outline of Final Research Achievements

Laser hardening makes it possible to harden only the necessary areas. It is a remarkable technology that is rapidly being used in industry because it not only improves strength, but also realizes a strain-free and clean working environment. In this research project, steel parts with corner angles (concave and convex) were targeted. Both experiments and analysis were conducted to establish a laser hardening technique to form hardened areas appropriately for a wide variety of corner angles. As a result, a method was found for analytically predicting the time variation of the temperature near the workpiece surface based on the difference in heat capacity between the concave and convex surfaces, and setting appropriate laser irradiation conditions based on the results.

Academic Significance and Societal Importance of the Research Achievements

レーザ焼入れ時の現象について、非定常熱伝導解析によるレーザ照射後の工作物表面付近の温度履歴に基づいて金属組織の変化を予測したことに学術的意義がある。そして、この知見を応用することで、部品形状および寸法に応じた適切かつ迅速なレーザ照射条件設定が実現され、これまで試行錯誤的な条件設定に悩まされた現状から脱却することができ、レーザ焼入れ技術の産業応用が一層拡大することが期待される。これにより、環境にやさしいものづくり技術の発展に寄与できることから社会的にも意義がある。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (3 results)

All 2023 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] PROPOSAL OF HIGH-QUALITY LASER HARDENING SYSTEM FOR SHAFT PARTS USING CYLINDRICAL MIRROR AND RING-BEAM SHAPED BY HIGH-SPEED LASER SCAN SYSTEM2020

    • Author(s)
      Hirotaka Tanabe, Keiji Ogawa, Heisaburo Nakagawa, Hirohito Tsukada, Yuki Goto
    • Journal Title

      Proceedings of the JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing

      Volume: -

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] A Study for Uniform Laser Hardening of Steel Parts with Convex and Concave Corners2023

    • Author(s)
      Keiji Ogawa, Hirotaka Tanabe, Masanori Fuwa, Heisaburo Nakagawa, Hirohito Tsukada and Yuki Goto
    • Organizer
      The 10th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高速スキャンレーザと筒状内面鏡を用いたシャフト部品の全周焼入れに関する基礎的検討2020

    • Author(s)
      不破雅教,田邉裕貴,小川圭二,中川平三郎,塚田悠人,後藤雄輝
    • Organizer
      砥粒加工学会学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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