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Challenge to develop high-precision boring tools based on self-excited vibration theory

Research Project

Project/Area Number 21K03949
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 20010:Mechanics and mechatronics-related
Research InstitutionOita University

Principal Investigator

Ryu Takahiro  大分大学, 理工学部, 教授 (60230877)

Co-Investigator(Kenkyū-buntansha) 松崎 健一郎  鹿児島大学, 理工学域工学系, 教授 (80264068)
中江 貴志  大分大学, 理工学部, 准教授 (80579730)
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: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords自励振動 / 回転体の振動 / 多角形化現象 / リーマ加工 / 不等分割刃 / ボーリング加工 / 時間遅れ系
Outline of Research at the Start

自動車の駆動部品に多用されているボーリング加工では,加工時に加工穴が多角形化し,加工精度の低下や,加工コストの悪化をもたらしており,その対策は急務である。本研究では,リーマ加工にターゲットを絞り,不等分割刃リーマの刃配置の最適化を図ることにより,多角形化現象を完全抑制可能な新たなリーマ加工工具を開発する。理論解析により最適化の状態を数値的に評価可能な統一的評価基準を定め,評価基準により求められた最適な不等分割刃リーマについて実験的に検証する。

Outline of Final Research Achievements

Theoretical analysis was performed using genetic algorithm to determine the angular arrangement of irregular-pitch reamer that can suppress the polygonal formation phenomenon of borehole with 4, 6, 7, and 8-flute reamers. As a result, it was found that the effect of optimized angular arrangement of cutting edges can reduce instability, and that there exists an angular arrangement that can stabilize polygonal deformation with 6, 7, and 8-flute reamers. Experiments were conducted using the irregular-pitch reamers with the optimized angular arrangements and regular-pitch reamers with even-pitch cutting edges. It was found that the roundness of the irregular-pitch reamer was significantly improved compared to that of the regular-pitch reamer. An evaluation criterion that is not dependent on the number of cutting edges was also proposed.

Academic Significance and Societal Importance of the Research Achievements

本研究は,リーマを主たるターゲットとしたボーリング加工における多角形化現象を完全に抑制可能な,切れ刃角度配置を求めること,および多角形化現象を完全抑制可能な角度配置を,統一的に評価できる理論的基準値(QCR値)を決定し,実験的に有効性を検証することが目的である。不等分割刃リーマに対する多角形化現象を完全に抑制できる手法を提案することは極めて有用性が高い。また,対策を定量化できるQCR値は,リーマ形状や刃数によらず,不安定性を評価できる基準値であるため,不等分割刃リーマの開発における設計指針となる。

Report

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

    (7 results)

All 2024 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (5 results)

  • [Journal Article] Countermeasures against polygonal defor-mation of borehole in reaming process and its detection method for 7-flute reamer2024

    • Author(s)
      Ryu T. Nakae T. Matsuzaki K. Matsumoto Y. Adachi S, Kitamura J. Tsukamoto K. Hirata N
    • Journal Title

      Proceedings of ICSV30

      Volume: 1 Pages: 1-8

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Countermeasures against polygonal deformation of borehole in reaming process2023

    • Author(s)
      Ryu T. Nakae T. Matsuzaki K. Matsumoto Y. Tsukamoto K. Hirata N
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2643 Issue: 1 Pages: 1-8

    • DOI

      10.1088/1742-6596/2643/1/012002

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] リーマ加工における加工穴多角形化現象 の防止対策と検出方法に関する研究2023

    • Author(s)
      松本雄大
    • Organizer
      Dynamics and Design Conference 2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] スパイラルマークを抑制するリーマ工具に関する研究2022

    • Author(s)
      丁 浩
    • Organizer
      Dynamics and Design Conference 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] エンドミル加工において工具の非等方的支持が自励びびりに及ぼす影響2022

    • Author(s)
      岩崎 圭佑
    • Organizer
      Dynamics and Design Conference 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 不等間隔刃を用いたリーマ加工における多角形穴抑制対策2021

    • Author(s)
      山下 夏暉
    • Organizer
      Dynamics and Design Conference 2021
    • Related Report
      2021 Research-status Report
  • [Presentation] エンドミル加工における自励びびりの安定性解析手法に関する研究2021

    • Author(s)
      佐畑 友輝
    • Organizer
      Dynamics and Design Conference 2021
    • Related Report
      2021 Research-status Report

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

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