2022 Fiscal Year Final Research Report
Residual stress control by double-sided incremental forming
| Project/Area Number |
20K05166
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26050:Material processing and microstructure control-related
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | インクリメンタルフォーミング / 板成形 / 残留応力 |
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| Outline of Final Research Achievements |
Excessive residual stress exists in incremental formed sheet metal parts, resulting in severe negative springback. In this study, the mechanism of residual stress generation that causes distortion and the effect of the relative location of the two tools in double-side incremental forming on residual stress were examined through numerical simulation using a material model estimated by the throwing method and a partial model. The results of the systematic study revealed the following The residual moment in the tool path direction can be reduced to almost zero by adjusting the pitch angle of the tool system. The residual moment in the tool path direction can be minimized when the gap between the tools is about the initial thickness.
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| Free Research Field |
塑性加工学
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| Academic Significance and Societal Importance of the Research Achievements |
インクリメンタルフォーミングは，日本で提案された新しいCNC塑性加工技術で，基本方式では１つの工具を等高線パスに沿って動かして目的とする曲面形状をその包絡面として得る．本方式は高価な金型を用いないフレキシブル成形技術である．しかし，このプロセスで得られるほとんどの成形品には過大な残留応力が蓄積しており，クランプ解放やトリミング後に激しい負のスプリングバックが発生し，これが実用化に際しての最大の課題となっている．これに対して本研究の成果はダブルサイド・インクリメンタル成形を採用し，そのマスターおよびスレーブ工具の相対運動をどのように制御すればよい結果が得られるかの重要な基礎資料を提供する．
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