Friction effects during open-die micro-forging/extrusion processes: An upper bound approach

Ehsan Ghassemali, Ming-Jen Tan, Chua Beng Wah, Samuel C.V. Lim, Anders E.W. Jarfors

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

7 Citations (Scopus)


In microforming processes it is preferred to not to use lubricants, due to their complex behavior in micro-scale. Nevertheless, using lubricants could increase the life time and decrease the required forming load. Thus, it is necessary to study and develop an analytical solution for different lubrication conditions in microforming processes. A previously studied upper bound model was modified in this study for various lubrication conditions in an open-die micro-forging/extrusion process. Two approaches were chosen for identifying the friction factor in the model: (i) global friction factor, (ii) localized friction factor. Comparison of the modeling results with the experimental showed the reliability of the second approach, providing a better fit.

Original languageEnglish
Title of host publication11th International Conference on Technology of Plasticity, ICTP 2014
Subtitle of host publication19-24 October 2014; Nagoya, Japan
EditorsTakashi Ishikawa, Ken-ichiro Mori
Number of pages6
Publication statusPublished - 2014
EventInternational Conference on Technology of Plasticity 2014 - Nagoya Congress Center, Nagoya, Japan
Duration: 19 Oct 201424 Oct 2014
Conference number: 11th

Publication series

NameProcedia Engineering
PublisherElsevier BV
ISSN (Electronic)1877-7058


ConferenceInternational Conference on Technology of Plasticity 2014
Abbreviated titleICTP 2014
OtherProcedia Engineering Volume 81
Internet address


  • Friction
  • Microforming
  • Microstructure
  • Size effect

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