2018 Fiscal Year Final Research Report
Development of Microtube Hydroforming Process Utilizing Incrementally Applied Ultra High Pressure
| Project/Area Number |
16K14440
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
MANABE Ken-ichi 首都大学東京, システムデザイン研究科, 客員教授 (10145667)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | マイクロ塑性加工 / チューブハイドロフォーミング / マイクロチューブ / 金型変形連成解析 / 型開き挙動 / 高圧繰返し負荷 / マイクロ成形性 / 材料流動促進 |
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| Outline of Final Research Achievements |
In this study, as a method to greatly improve the low hydroformability of metal microtubes, an innovative new idea to allow the die opening (elastic deformation) to be actively permitted when high internal pressure was proposed. For a cross-shape hydroforming process of a long microtube where the influence of frictional resistance is remarkable, macroscopic homogeneous finite element simulation was carried out to confirm material flow behavior into the branch cavity by utilizing the elastic deformation of the die during process which applies a high internal pressure and allowing die opening and die closing processes. As a result, material flow was further improved, and the possibility of significant improvement of hydroformability and reduction of internal pressure could be shown. In the basic experimental work, cross shape forming and T-forming experiments using a micro tube with outer diameter of 0.5 mm, which has not been successful worldwide, have succeeded.
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| Free Research Field |
機械工学 塑性加工学 マイクロ成形加工
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| Academic Significance and Societal Importance of the Research Achievements |
摩擦係数が増加するマイクロ加工領域で摩擦抵抗を低減させる方法として、金型の弾性応答を利用して型開きを許容し材料流動性を高め、型閉じ過程での摩擦抵抗の向きの変化による材料流動制御の可能性を示した本成果は意義深い。また型開きと型閉じを繰り返す逐次成形に向けた有益な成果である。さらに従来の巨視的均質有限要素法が、肉厚方向の結晶粒数が十分な材料であれば、マイクロ領域での適用可能性を示せたことは学術的に意義深い。社会的意義としては低侵襲医療が叫ばれ医療器具のさらなるマイクロ化が要求されている中、低コストで高機能性をもつ金属製医療器具のマイクロ加工や低侵襲性に効果的な部品開発に寄与する成果といえる。
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