Study of the flow behavior and defect formation in forming of axisymmetrically flanged and multi-scaled parts

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• 作者：Jilai Wang ; Mingwang Fu ; Junxi Yu ; Xing Wang…
• 关键词：Flow ; induced defect ; Multi ; scaled flanged parts ; Size effects
• 刊名：International Journal of Precision Engineering and Manufacturing
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：17
• 期：10
• 页码：1341-1349
• 全文大小：1,429 KB
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Materials Science
  
• 出版者：Korean Society for Precision Engineering, in co-publication with Springer Verlag GmbH
• ISSN：2005-4602
• 卷排序：17

文摘

In microforming, the quality of microparts is one of the most critical issues. Folding caused by the abnormal material flow is one of the most common flow-induced defects in macroforming process. The identified formation mechanism of flow-induced defects in macro-forming process could be affected by the so-called size effects when the part dimension is scaled down to micro scale. Therefore, it is necessary to investigate the influence of size effects on the material plastic flow and deformation behavior in multiscaled deformation scenarios. To explore the formation mechanism of flow-induced defects, FE simulation is used to simulate the forming process. On the other hand, the multi-scaled forming was designed. To study the relationship of the flow-induced defect and sizes effects, forming of the axisymmetric parts with flanged features and different scales was conducted. The microstructure and plastic flow behavior of the deformed parts are also revealed. Based on the experimental and FEM simulation results, the formation of folding defects is mainly affected by the geometries and the sizes of the deformed flanged parts instead of grain sizes. In the cases by using material with coarse grains, the folding defect can be significantly reduced.