Spur gear manufacturing study using CFRTP

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04191
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Kanazawa 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
• Keywords: CFRTP / 歯車 / 鍛造 / 長繊維

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.

Free Research Field

成形加工

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．