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Dead-zone formation and micro-pin properties in progressive microforming process
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
Sch. of Mech. & Aerospace Eng., Nanyang Technological University, Singapore.ORCID iD: 0000-0002-0101-0062
Sch. of Mech. & Aerospace Eng., Nanyang Technological University, Singapore.
Singapore Institute of Manufacturing Technology (SIMTech)..
2011 (English)In: ICTP 2011, 10th International Conference on Technology of Plasticity, Steel Research International: Special Edition, Aachen, DE, Sep 25-29, 2011, Weinheim: Wiley-VCH Verlagsgesellschaft, 2011, no 9, 1014-1019 p.Conference paper (Refereed)
Abstract [en]

A novel progressive microforming process that consisted of a two step operations, punching and blanking was studied. Micropins with diameter of 300 µm were manufactured from metal strip to cater for a set-up with good potential for mass production. Investigations showed that the microstructure contains some deformed zones surrounded by less-deformed zones or "dead-zones" which is unique to the progressive microforming process. The aim of this work was to understand the origin and evolution of the "dead-zones" in the microstructure of the final products during the progressive microforming process, and find a way to avoid this phenomenon. To do this, the microstructure of the 300 µm pins with punch diameters of 3.2 and 2.2 mm at different punch displacement was investigated experimentally and by simulation. Experimental observations showed that dead-zones appear just after starting the microforming process, which is due to the friction at the workpiece-die interface. This dead zone leaks into the die cavity as a result of work-piece compression. It was shown that the inhomogeneous mechanical properties could be significantly improved by selection of an appropriate punch.

Place, publisher, year, edition, pages
Weinheim: Wiley-VCH Verlagsgesellschaft, 2011. no 9, 1014-1019 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-24220ISBN: 978-3-514-00784-0 (print)OAI: oai:DiVA.org:hj-24220DiVA: diva2:732530
Conference
ICTP 2011, 10th International Conference on Technology of Plasticity, Steel Research International: Special Edition, Aachen, DE, Sep 25-29, 2011
Available from: 2014-07-04 Created: 2014-07-04 Last updated: 2015-09-11Bibliographically approved

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CiteExportLink to record
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  • apa
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