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Study on Form Rolling Method of High Strength FRP Screw Thread Using Ultrasonic Vibration

Research Project

Project/Area Number 05452143
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionTokyo Institute of Technology

Principal Investigator

MARUYAMA Kazuo  Tokyo Institute of Technology Precision and Intelligence Laboratory, Professor, 精密工学研究所, 教授 (80016774)

Co-Investigator(Kenkyū-buntansha) TSUJI Hirokazu  Tokyo Institute of Technology Precision and Intelligence Laboratory, Associate, 精密工学研究所, 助手 (10163841)
UEHA Sadayuki  Tokyo Institute of Technology Precision and Intelligence Laboratory, Professor, 精密工学研究所, 教授 (90016551)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥6,900,000 (Direct Cost: ¥6,900,000)
KeywordsScrew thread / Form rolling / Fiber reinforced plastics / FRTP / Ultrasonic vibration / Bolt
Research Abstract

The bolt, that is fastening threaded parts, has been produced of fiber reinforced thermoplastics (FRTP) which have been applied in many field. However, FRTP screw threads produced by the injection molding or the form rolling have some problems concerning form accuracy and mechanical strength. If the ultrasonic vibration is utilized for the form rolling of FRTP threads, the thread blank is heated from its inside and is apt to deform. Therefore the improvement of form accuracy and mechanical strength is expected.
Firstly, the form rolling machine in order to roll annular multi-V-grooves are designed and produced on trial, and then the relationship between the rolling condition, such as vibration amplitude, rolling force and so on, and the form accuracy of annular multi-V-grooves was evaluated. As a result, the height of V-groove was not enough in comparison with that of tool indentation, though the effect of ultrasonic vibration was confirmed. As a reason, it is guessed that the amount of indentation couldn't be sufficiently controlled because the stiffness of rolling mechanism was not enough and the rolling force was given by a lever with dead weights.
Therefore, a new indentation device which has high stiffness and can control the amount and the speed of tool indentation, was designed and produced on trial, and the experiment was carried out, varying the rolling condition, and the V-groove section was observed by SEM.
The obtained main result are followings ;
(1) The condition of form rolling in order to make the annular multi V-groove with high accuracy was clarified.
(2) The fiber flow at the section of V-groove is improved by the form rolling in the new machine using ultrasonic vibration.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 丸山一男、辻裕一、小野塚英明: "超音波振動によるFRTPねじの転造(丸ダイスによるV溝の転造)。" 1993年度精密工学会秋季大会学術講演会講演論文集. 959-960 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Maruyama, H.Tsuji and H.Onozuka: "Form rolling of FRTP screw threads using ultrasonic vibration (Form rolling of annular V-groove by circular dies)" Preprint of the Fall Meetin of the Japan Society of Precision. Engineering. 959 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 丸山,辻,小野塚: "超音波振動によるFRTPねじの転造(丸ダイスによるV溝の転造)" 1993年度精密工学会秋季大会学術講演会講演論文集. 959-960 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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