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Experimental and Simulation of Friction Effects in an Open-Die Microforging/Extrusion Process
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Nanyang Technological University, Singapore; Singapore Institute of Manufacturing Technology, Singapore.
Nanyang Technological University, Singapore.
Monash University, Clayton, Australia.
Singapore Institute of Manufacturing Technology, Singapore.
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2014 (English)In: Journal of Micro and Nano-Manufacturing, ISSN 2166-0468, Vol. 2, no 1, 011005- p.Article in journal (Refereed) Published
Abstract [en]

Friction effects during a progressive microforming process for production of micropins of various diameters were experimentally investigated and were analytically modeled, using a hybrid friction model. The response surface method and ANOVA analysis were used to generalize the findings for various pin diameters. Besides, it was shown that to get an accurate result in simulation, the friction model must be considered locally instead of a global friction model for the whole process. The effect of friction factor on the final micropart dimensions (the effect on the instantaneous location of the neutral plane) and the forming pressure were investigated. The results showed a reduction in the friction factor as die diameter increased. Following that, the optimum frictional condition to obtain the highest micropart aspect ratio was defined as the maximum friction on the interface between the die upper surface and the punch surface, together with a minimum friction inside the die orifice.

Place, publisher, year, edition, pages
ASME Press, 2014. Vol. 2, no 1, 011005- p.
Keyword [en]
Microforming, Friction, Size effect
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-24215DOI: 10.1115/1.4026518OAI: oai:DiVA.org:hj-24215DiVA: diva2:732515
Available from: 2014-07-04 Created: 2014-07-04 Last updated: 2015-10-02

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