| Project/Area Number |
23KJ0455
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 国内 |
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| Review Section |
Basic Section 18020:Manufacturing and production engineering-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
WANG SHUOHAN 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2023-04-25 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2024: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2023: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | hybrid direct joining / metal-polymer / injection molding / additive |
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| Outline of Research at the Start |
近年，軽量化技術への需要から金属-樹脂直接接合技術に対する関心が高まっており，国内外で様々な接合技術に関する研究が進められているが，信頼性の低さなどの問題から製造分野での本格導入には至っていない．本研究では，金属表面粗化と樹脂の射出成形という二つの要素技術を利用した手法に関して，産業導入に向けた信頼性確立を目指した研究を行う．
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| Outline of Annual Research Achievements |
With the increasing demand for lighter structures, the technology for bonding metals and plastics has become essential across various industries. Among the available methods, techniques that combine metal surface roughening with plastic injection molding, known as IMDJ (Injection Molded Direct Joining), are particularly significant due to their selectivity of materials and high productivity. However, these direct bonding methods have yet to achieve widespread practical use due to the challenges associated with low joint strength and the insufficient understanding of the bonding mechanisms.
Based on previous research and industrial demands, this study focuses on metal surface treatment methods that do not require the use of chemical substances. It also aims to optimize the strength of these methods and clarify the principles of bonding.
Investigation of the dependency of joint strength on blasting conditions in blast-assisted IMDJ. And enhancement of joint performance through the use of additives, with analyses of sub-microscale mechanisms were mainly focused on this year. The findings were shared at conferences and published in the “International Journal of Automation Technology” and “Materials Letters”, highlighting the research's contribution to bonding technology and polymer modification in IMDJ.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
In the research plan, this study encompasses four main components. 1)Complication of the metal surface structure for IMDJ technology. 2)Improvement of the joint performance further by using additives. 3) Explore the effects of various durability tests on the joint’s polymer. 4) Development of THz polymer internal status measurement system.
This year, methods for fabricating metal surface structures without chemical usage, including blast and blast + HWT, have been explored. Research on enhancing joint performance with additives has been conducted. The joining performance has improved, and the mechanisms involved have been analyzed. These findings have been published in an international journal paper. Additionally, the environmental durability of IMDJ is currently being studied. The THz polymer internal status measurement system is under construction.
Overall, progress is exceeding expectations.
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| Strategy for Future Research Activity |
Based on the research plan, the next steps will focus on the development of the THz polymer internal status measurement system and exploring the effects of various durability tests on the joint's polymer.
Regarding the THz polymer internal status measurement system, a THz detection system will be developed, featuring a continuous wave (CW) difference frequency generation (DFG) laser, THz polarizers, lenses, and a detector. This system aims to detect the polymer orientation and residual stress without causing sample damage. Although the system may not be applied to the joining sample next year, it will lay the foundation for subsequent steps.
For the environmental durability of the IMDJ joints, emphasis will be placed on temperature durability. The joint's temperature durability will be assessed using an environmental testing machine. The mechanisms of the changes observed will be analyzed.
These results are expected to significantly enhance the credibility of IMDJ technology, based on compliance with joint performance standards and a deeper understanding of the joining mechanisms.
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