2022 Fiscal Year Final Research Report
Testing Method to Identify Yield Parameters on Metal Powder Compaction for FEM Analysis of Compaction Failure Occurrence
| Project/Area Number |
20K04204
|
|---|
| 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 | Nara National College of Technology |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2020-04-01 – 2023-03-31
|
| Keywords | Powder Compaction / Drucker-Prager CAP model / Finite Element Method / Powder Metallurgy |
|---|
| Outline of Final Research Achievements |
In this study, we attempt FEM analysis for a series of compaction process, Which are Compacting into inner flange shape, Unloading of tools, And ejection from die cavity. FEM analysis of iron powder compaction process for inner flange shape has been performed to demonstrate shear yield behavior on unloading and ejection stage. Three different tool motion, semi-double and double action pressing were investigated. The magnitude of density distribution becomes narrow on double-action tool motion with adequate tool speed ratio, and it can be examined what speed ratio should be applied. It was possible to predict where cracks may occur by the evaluation of stress path in ejection stage.
|
| Free Research Field |
粉末成形
|
| Academic Significance and Societal Importance of the Research Achievements |
近年，粉末成形の理論が確立され、有限要素法を適用し、型からの抜出し時の割れ発生を含めた圧粉工程設計の事前検討～最適化に活用できるようになった．ところが，金属粉末圧粉工程設計における活用例がみられない。これは，DPCモデルの降伏曲面形状が複雑であり，金属粉末においてはその形状を決定する降伏関数パラメータの同定手法が一般化されていないことに起因している．本研究成果は、簡便な試験によってパラメータを同定できることを示すとともに、解析によって不良発生事例を見える化できることを示したものである。既に活用されている鍛造解析と同様に、粉末成形の生産現場においても解析技術活用を推進できる点で意義がある。
|
