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Highly Efficient Surface Smoothing by Clarification of EB Polishing Mechanism with Considering Flow of Material

Research Project

Project/Area Number 21K03807
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 InstitutionOkayama University

Principal Investigator

Shinonaga Togo  岡山大学, 環境生命自然科学学域, 助教 (60748507)

Co-Investigator(Kenkyū-buntansha) 岡本 康寛  岡山大学, 自然科学学域, 准教授 (40304331)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords大面積電子ビーム / EBポリッシング / 表面平滑化 / 表面粗さ / 熱流体解析 / 溶融金属 / 表面張力 / 微細凹凸形状 / 電磁場解析 / 電子ビーム / 電子集中現象
Outline of Research at the Start

射出成型金型や金属製インプラント表面は,表面粗さを1μmRz程度以下にする表面仕上げが必要である.通常,これら金属材料の表面仕上げは手磨きにより行われるが,熟練した技術や長時間を要するため,表面仕上げの高能率化が課題となっている.大面積電子ビームを用いたEBポリッシング法は材料の極表面を瞬時に溶融・蒸発することができ,数μmRzの初期表面粗さを有する金属材料の高能率表面仕上げが可能である.本研究課題では,凸部への電子集中現象,溶融金属の凹部への流動・再凝固層現象を考慮した熱流体解析によりEBポリッシングメカニズムの解明を試みる.また,表面粗さの大きな凹凸形状に対する高能率表面平滑化を試みる.

Outline of Final Research Achievements

In large-area electron beam (EB) irradiation, metal surface can be melted instantly and uniformly by the EB irradiation with high energy density. Then, metal mold surface with surface roughness of several μmRz can be reduced to less than 1.0 μmRz, and surface finishing of metal molds can be done efficiently by EB polishing. However, mechanism of the EB polishing has not been clarified yet. It is expected that EB is concentrated on small convex parts of metal surface and molten metal is flowed into concave parts. In this study, EB polishing mechanism was clarified by thermo-fluid analysis. EB concentration phenomena on convex parts were also investigated by electro-magnetic field analysis. In addition, highly efficient surface smoothing of metal products with large surface roughness was proposed.

Academic Significance and Societal Importance of the Research Achievements

金属製品は用途に応じて表面仕上げが必要である.これまでの研究で,大面積電子ビーム照射法を用いたEBポリッシングによって,鉄鋼系金型などを高能率に表面平滑化することができることを明らかにしてきた.しかしながら,EBポリッシングメカニズムについては未解明であった.本研究で構築した熱流体解析により,電子ビーム照射による溶融金属の流動や表面形状変化の過程などを見出すことができた.研究成果は,様々な実用材料や加工面に対して,EBポリッシングにより高能率な表面仕上げを実現するために有用であると考えられる.さらに,大面積電子ビーム照射によるフィレット加工など,様々な加工現象の解明にも有効である可能性がある.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Surface smoothing of additively manufactured Ti-6Al-4V alloy by combination of grit blasting and large-area electron beam irradiation2023

    • Author(s)
      Shinonaga Togo、Kobayashi Hiroya、Okada Akira、Tsuji Toshiya
    • Journal Title

      The International Journal of Advanced Manufacturing Technology

      Volume: 127 Issue: 11-12 Pages: 5127-5137

    • DOI

      10.1007/s00170-023-11857-5

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Synergy Effect of Abrasive Blasting and Large-area EB Irradiation on Surface Finishing of AMed Titanium Alloy2022

    • Author(s)
      KOBAYASHI Hiroya、SHINONAGA Togo、TSUJI Toshiya、OKADA Akira
    • Journal Title

      Procedia CIRP

      Volume: 113 Pages: 318-322

    • DOI

      10.1016/j.procir.2022.09.109

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Study on Smoothing of Hole Wall Surface by Electron Beam Polishing under Control of Magnetic Field2022

    • Author(s)
      SHINONAGA Togo、LU Jiayu、INOUE Motohiro、OKADA Akira
    • Journal Title

      Procedia CIRP

      Volume: 113 Pages: 536-540

    • DOI

      10.1016/j.procir.2022.09.184

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet2022

    • Author(s)
      Togo Shinonaga, Jiayu Lu, Mitsuhiro Kimura, Motohiro Inoue, Akira Okada
    • Journal Title

      The International Journal of Advanced Manufacturing Technology

      Volume: 119 Issue: 7-8 Pages: 4979-4990

    • DOI

      10.1007/s00170-021-08380-w

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 大面積パルス電子ビーム照射による金属AM造形物の表面平滑化2024

    • Author(s)
      篠永東吾
    • Organizer
      日本金属学会・日本鉄鋼協会 中国四国支部 第55回「若手フォーラム」
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 大面積電子ビーム照射による表面平滑化技術について2024

    • Author(s)
      篠永東吾
    • Organizer
      砥粒加工学会 次世代固定砥粒加工プロセス専門委員会 第114回研究会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 大面積電子ビーム照射による金属AM造形物のめっき皮膜欠陥抑制2023

    • Author(s)
      篠永東吾,松田悠生,岡田晃
    • Organizer
      電気加工学会全国大会(2023)
    • Related Report
      2023 Annual Research Report
  • [Presentation] 熱流体解析による大面積電子ビーム照射におけるエッジ部形状変化メカニズムの解明2022

    • Author(s)
      田島響,篠永東吾,岡本康寛,岡田晃
    • Organizer
      日本機械学会第14回生産加工・工作機械部門講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] 熱流体解析による凹凸平均間隔がEBポリッシング効果に及ぼす影響の解明2022

    • Author(s)
      小林裕野,篠永東吾,三浦誠也,岡田晃,辻俊哉
    • Organizer
      電気加工学会全国大会(2022)
    • Related Report
      2022 Research-status Report
  • [Presentation] Investigation on Mechanism of Edge Shape Change in Large-area Electron Beam Irradiation by Thermo-fluid Analysis2022

    • Author(s)
      Hibiki Tajima, Togo Shinonaga, Akira Okada
    • Organizer
      2022 International Conference on Machining, Materials and Mechanical Technologies (2022 IC3MT)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 熱流体解析によるEBポリッシングメカニズムの解明2022

    • Author(s)
      太田翔也,酒井翼,篠永東吾,岡本康寛,岡田晃
    • Organizer
      2022年度精密工学会春季大会学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Fundamental Study on Side Surface Smoothing of Hole by Large-area EB Irradiation Method2021

    • Author(s)
      Jiayu LU, Togo SHINONAGA, Motohiro INOUE, Akira OKADA
    • Organizer
      10th International Conference on Leading Edge Manufacturing in 21st Century (LEM21)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Surface Smoothing and Surface Modification of Maraging Steel by Large-area EB Irradiation2021

    • Author(s)
      Shun WATANABE, Togo SHINONAGA, Atsushi YAMAGUCHI, Akira OKADA
    • Organizer
      10th International Conference on Leading Edge Manufacturing in 21st Century (LEM21)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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