2022 Fiscal Year Final Research Report
Flexible Thickness Control of Hydroforming by Forced Lubrication Method in Arbitrary Region and Time
| Project/Area Number |
21K14058
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18020:Manufacturing and production engineering-related
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | 塑性加工 / 管材 / 鉄鋼材料 / チューブハイドロフォーミング / 軽量化 / 強制潤滑 / 自動車構造部材 / 肉厚制御 |
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| Outline of Final Research Achievements |
In this study, we performed experiments on time- and area-dependent forced lubrication during tube hydroforming based on this technology. We obtained the following findings about time-dependent lubrication: 1) The thickness distribution can be controlled by lowering the lubricant pressure during forming. 2) Increasing the internal pressure at which the lubricant pressure is lowered tended to reduce the thickness in the vicinity of the lubricant supply port (center of the flat area) and increase the thickness of corners. In other words, there was a trade-off between the thickness of flat areas and corners. 3) Controlling the lubricant from the start to the middle stage of forming is important in controlling the thickness distribution. We obtained the following finding about area-dependent lubrication: 4) Lubricant flow can be held back by providing a level difference of 0.1 mm-0.2 mm at a position 5 mm-15 mm from the lubricant supply port.
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| Free Research Field |
塑性加工
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| Academic Significance and Societal Importance of the Research Achievements |
本技術は特許出願済（特開2023-037121）であり全く新しい．本研究では潤滑剤の制御により構造部材の肉厚を部位毎に変更できることをはじめて実証した．即ち難成形材の成形性の向上と，肉厚分布の自在制御による部材の軽量化の可能性を見出すことができた．今後，本技術を適用した構造部材の強度評価を行いその影響を検証予定である．これらの成果は，CO2排出量の削減と地球環境の保護に資するものである．
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