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Achieving stress- and defect-free and all-fused surface flexible glass using laser fusion cutting technology

Research Project

Project/Area Number 22K14157
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Itoh Sho  千葉大学, 大学院工学研究院, 特任助教 (70743441)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsレーザ溶断 / フレキシブルガラス / 残留応力 / 曲げ強度 / レーザ / 溶断
Outline of Research at the Start

新機能性材料として期待されるフレキシブルガラスの新規切断技術の提案,プロセスの検証,応用として商用ガラスの加工に取り組む.フレキシブルガラスはその薄さから切断が難しく,従来のガラス切断手法は,端面における曲げ強度が低い,自由形状の切断が困難である等の欠点がある.本申請では,上記の問題を同時に解決できる,フレキシブルガラスのレーザ溶断実現と,その加工原理を解明する.レーザ溶断時の温度分布制御により,熱歪みの除去を達成する.レーザ照射部近傍の解析により,レーザ溶断における光吸収,加熱,冷却,飛散の加工過程を明らかにする.

Outline of Final Research Achievements

The study was aimed at establishing a laser fusing technique for flexible glass. The study showed that cutting flexible glass using a CO2 laser and controlling the edge shape was possible. The study demonstrated that overlapping irradiation of multiple laser beams could reduce thermal residual stress, and the mechanism was discussed. The two-point bending strengths of approximately 600 MPa and 300 MPa were achieved on the front and back surfaces, respectively (average values). It was also shown that flexible glass can be cut using a CO laser with a different wavelength and longer optical penetration lengths than a CO2 laser. Monitoring during processing clarified the formation mechanism of voids behaving as edge defects.

Academic Significance and Societal Importance of the Research Achievements

学術的意義としては,ガラスのレーザ溶断における端面形状の微細制御メカニズムや,熱歪みの制御メカニズムを解明できたことや,また加工点における局所溶融現象を明らかにできたことにある.
また社会的意義としては,(1)フレキシブルガラスはフリーフォームディスプレイ,フレキシブルOLED照明,半導体部品(インターポーザなど),建築部材やソーラーパネルのカバー部材など様々な応用が期待され,本切断方法により応用を促進に寄与できる.(2)また,新切断技術を提案することにより,従来のケミカルエッチングによる端面仕上げ工程を省くことも可能となる.

Report

(2 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (2 results)

All 2022

All Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] レーザ溶断によるフレキシブルガラスの溶融切断端面形成の試み2022

    • Author(s)
      長野尚人,伊東翔,比田井洋史,松坂壮太
    • Organizer
      砥粒加工学会学術講演会 (ABTEC2022)
    • Related Report
      2022 Research-status Report
  • [Presentation] Feasibility study on laser fusion cutting of ultra-thin glass (UTG) aimed for defect-free, molten edge formation2022

    • Author(s)
      S. Itoh, N. Nagano, S. Obuchi, S. Matsusaka, H. Hidai
    • Organizer
      The 9th International Conference of ASPEN
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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