TY - JOUR
T1 - A novel method to alleviate flash-line defects in coining process
AU - Xu, Jiangping
AU - Khan, Kamran
AU - El Sayed, Tamer S.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was fully funded by MUST baseline research funds.
PY - 2013/4
Y1 - 2013/4
N2 - We employ a finite element framework based on a dynamic explicit algorithm to predict the flash-line defects in the coining process. The distribution of the flash-line is obtained by building a radial friction work model at the element level. The elasto-plastic behavior of porous materials undergoing large deformations is considered where the constitutive level updates are the result of a local variational minimization problem. We study the material flow at different strokes of the die across the entire coining process and observe that the change in the flow direction of the material in the rim region may contribute to the flash lines. Our proposed framework shows that a part of the rim region in which the flash-line defects appear is consistent with the reported experimental results. We also propose a novel method of redesigning the rim geometry of the workpiece to alleviate the flash-line defects which also shows good agreement with experiments. © 2012 Elsevier Inc. All rights reserved.
AB - We employ a finite element framework based on a dynamic explicit algorithm to predict the flash-line defects in the coining process. The distribution of the flash-line is obtained by building a radial friction work model at the element level. The elasto-plastic behavior of porous materials undergoing large deformations is considered where the constitutive level updates are the result of a local variational minimization problem. We study the material flow at different strokes of the die across the entire coining process and observe that the change in the flow direction of the material in the rim region may contribute to the flash lines. Our proposed framework shows that a part of the rim region in which the flash-line defects appear is consistent with the reported experimental results. We also propose a novel method of redesigning the rim geometry of the workpiece to alleviate the flash-line defects which also shows good agreement with experiments. © 2012 Elsevier Inc. All rights reserved.
UR - http://hdl.handle.net/10754/562699
UR - https://linkinghub.elsevier.com/retrieve/pii/S0141635912001742
UR - http://www.scopus.com/inward/record.url?scp=84873730672&partnerID=8YFLogxK
U2 - 10.1016/j.precisioneng.2012.11.001
DO - 10.1016/j.precisioneng.2012.11.001
M3 - Article
VL - 37
SP - 389
EP - 398
JO - Precision Engineering
JF - Precision Engineering
SN - 0141-6359
IS - 2
ER -