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Open AccessArticle

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

1
Department of High-efficiency Machining Technologies, Moscow State University of Technology STANKIN, Vadkovskiy per. 3A, 127055 Moscow, Russia
2
Department of Plastic Deformation System, Moscow State University of Technology STANKIN, Vadkovskiy per. 3A, 127055 Moscow, Russia
*
Author to whom correspondence should be addressed.
Technologies 2019, 7(4), 70; https://doi.org/10.3390/technologies7040070
Received: 8 July 2019 / Revised: 31 August 2019 / Accepted: 19 September 2019 / Published: 24 September 2019
(This article belongs to the Special Issue Processing and Fabrication of Advanced Materials)
Highly performance methods for cold pressing (cold die forging) of preforms from iron powder with subsequent heat treatment and producing ready parts made of powder are described in the paper. These methods allow fabricating parts with smooth surfaces and improved mechanical characteristics—porosity, tensile strength. Application of the traditional design set-up with a single-axial loading is restricted to high stresses in the dies to deform the preforms that lead to cracks formation. New powder compaction schemes by applying active friction forces (shear-enhanced compaction) make it possible to unload dies and produce high-quality parts by cold pressing. The scheme allows moving the die in the direction of the material flow with a velocity that exceeds the material flow velocity. View Full-Text
Keywords: powder metallurgy; iron powder; cold pressing; cold forging; cold extrusion; graphite coating; active friction forces; sintered preforms powder metallurgy; iron powder; cold pressing; cold forging; cold extrusion; graphite coating; active friction forces; sintered preforms
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MDPI and ACS Style

Grigoriev, S.N.; Dmitriev, A.M.; Korobova, N.V.; Fedorov, S.V. A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts. Technologies 2019, 7, 70.

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