Finite Element Analysis of Grain Size Effects on Curvature in Micro-Extrusion
| Autor: | Kuniaki Dohda, Numpon Mahayotsanun, Norio Takatsuji, Sujin Bureerat, Tatsuya Funazuka, Sedthawatt Sucharitpwatskul, Pavaret Preedawiphat |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
business.product_category
Materials science 02 engineering and technology finite element analysis Curvature lcsh:Technology law.invention lcsh:Chemistry 0203 mechanical engineering law General Materials Science Composite material micro-extrusion Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes grain size Bearing (mechanical) lcsh:T Process Chemistry and Technology General Engineering 021001 nanoscience & nanotechnology Finite element method Grain size lcsh:QC1-999 Computer Science Applications 020303 mechanical engineering & transports lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 curvature Die (manufacturing) 6063 aluminium alloy Extrusion Grain boundary aluminum alloy 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences, Vol 10, Iss 4767, p 4767 (2020) Applied Sciences Volume 10 Issue 14 |
| ISSN: | 2076-3417 |
| Popis: | The precision and accuracy of the final geometry in micro-parts is crucial, particularly for high-value-added metallic products. Micro-extrusion is one of the most promising processes for delivering high-precision micro-parts. The curving tendency observed in micro-extrusion parts is a major concern, significantly affecting the final part geometry. The purpose of this paper was to investigate the driving mechanism behind the curvature in micro-extrusion at room temperature. A finite element (FE) simulation was carried out to observe the influential primary factors: (1) grain size, (2) grain boundary, (3) grain orientation, and (4) bearing length of a 6063 aluminum alloy. The Extrusion Curvature Index (ECI) was also established to indicate the level of curvature in micro-extruded parts. The results showed that the grain boundary at the high strain and die opening area was the dominant factor for single-grain conditions. The interactive effects of the grain boundary and grain orientation also affected the curvature under single-grain conditions. If the number of grains across the specimen increased up to 2.7 (poly-grains), the curvature effect was dramatically reduced (the pins were straightened). For all conditions, the curvature in micro-extrusion could be eliminated by extending the bearing length up to the exit diameter length. |
| Databáze: | OpenAIRE |
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