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Spur gear manufacturing study using CFRTP

Research Project

Project/Area Number 20K04191
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 InstitutionKanazawa University

Principal Investigator

Tatsuno Daichi  金沢大学, 設計製造技術研究所, 助教 (30714159)

Co-Investigator(Kenkyū-buntansha) 米山 猛  金沢大学, 設計製造技術研究所, 研究協力員 (30175020)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
KeywordsCFRTP / 歯車 / 鍛造 / 長繊維 / 不連続繊維 / 炭素繊維強化熱可塑性樹脂 / 熱可塑性CFRP / 歯車成形 / 繊維流動 / 繊維配向 / 強度
Outline of Research at the Start

本研究は,同じ重量の鋼鉄と比較して約10倍の強度がある炭素繊維強化樹脂(CFRP)を使って,軽くて強度の高い歯車を成形する方法を開発することが目的である.繊維を短く切って成形性を高めた熱可塑性CFRPを金型内で鍛造成形する際,繊維がどのように流動して歯車が形成されるのか,高い強度の歯車を製作するにはどのような繊維配向が望ましいのか,適切な配向を実現するための材料および加工条件はどのようなものか,を明らかにする.

Outline of Final Research Achievements

A spur gear manufacturing process using carbon fiber reinforced thermoplastic(CFRTP) was developed. Specifically, a cylindrical block called billet was made from unidirectional CFRTP chips 30 mm long, and heated to compress and deform it in a gear die to form spur gears without cutting fibers. Considering the fiber flow during the deformation process, we found that by alternating dozens of layers of circumferential and axial fibers on the billet surface, it is possible to form carbon fiber layers along the gear after forming and reduce the variation in tooth strength.

Academic Significance and Societal Importance of the Research Achievements

本研究の手法では繊維を切らず,かつ繊維体積密度が50%程度の歯車を成形することできるため高い強度の歯車を成形できる.一般的な射出成型で製作される歯車に対して高い強度を有するため,より高い負荷に対応した歯車の実現につながる.また,成形過程での変形メカニズムを解明したうえで,適切なビレット設計法を明らかにした点で,歯車以外のCFRTP成形に応用可能な知見を得ることができた.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2022 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] Fiber deformation behavior of discontinuous CFRTP in gear forging2021

    • Author(s)
      Tatsuno Daichi、Yoneyama Takeshi、Kuga Misaki、Honda Yoshitomo、Akaishi Yukihiro、Hashimoto Hayato
    • Journal Title

      International Journal of Material Forming

      Volume: - Issue: 5 Pages: 947-960

    • DOI

      10.1007/s12289-021-01611-1

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 歯車成形における不連続熱可塑性CFRP の変形2022

    • Author(s)
      立野大地
    • Organizer
      2022年度塑性加工春季講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 熱可塑性CFRP歯車成形における繊維配向の効果2021

    • Author(s)
      久我海咲
    • Organizer
      2021年度塑性加工春季講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] 熱可塑性CFRPを用いた歯車成形と強度評価2020

    • Author(s)
      久我海咲,米山猛,立野大地,赤石幸宏,本田良知,橋本勇統
    • Organizer
      第71回塑性加工連合講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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