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Frictional mechanisms in mixed lubricated regime in steel sheet metal forming
Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).ORCID-id: 0000-0001-8058-1252
KIMAB, Corrosion and Metals Research Institute AB, S-114 28 Stockholm, Sweden.
2008 (Engelska)Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, nr 5-6, s. 474-479Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The friction is of critical importance to sheet metal forming operations. It affects the flow of material in the tool and thereby the scrap rate and final quality of products. In the experimental work the frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. The study includes stainless steel, but previous research on carbon steels, coated and uncoated, are discussed also. The experimental results could be explained by the theory of pad bearings. The frictional response showed a correlation to the surface topography, e.g. the amplitude parameter (Sq) and texture aspect ratio parameter (Str). When predicting the frictional response of surfaces with multi-component distributions, the standard deviation of the distribution above the mean line could be used.

Ort, förlag, år, upplaga, sidor
Amsterdam: Elsevier, 2008. Vol. 264, nr 5-6, s. 474-479
Nyckelord [en]
Surface roughness, Steel sheets, Bending under tension, Mixed lubrication, Pad bearings, WC-index
Nationell ämneskategori
Annan teknik
Identifikatorer
URN: urn:nbn:se:hh:diva-1326DOI: 10.1016/j.wear.2006.08.032ISI: 000253174800018Scopus ID: 2-s2.0-37449013634Lokalt ID: 2082/1705OAI: oai:DiVA.org:hh-1326DiVA, id: diva2:238544
Tillgänglig från: 2008-04-16 Skapad: 2008-04-16 Senast uppdaterad: 2018-03-23Bibliografiskt granskad
Ingår i avhandling
1. Tribology of stamping: the influence of designed steel sheet surface topography on friction
Öppna denna publikation i ny flik eller fönster >>Tribology of stamping: the influence of designed steel sheet surface topography on friction
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Tribology is the science of friction, wear, and lubrication; the interaction of surfaces in relative motion. The tribological conditions in sheet metal forming influences the flow of material in forming operations, the strain distributions of sheet material, extent of wear, and thereby the quality of products. The purpose of the thesis is to increase the knowledge of why and how sheet surface topography influence the frictional response in stamping, to characterise the geometrical properties, and make results applicable for industry. The frictional response of different surface topographies have been measured in a Bending Under Tension test under mixed lubricated conditions. The studied materials have been stainless steel sheets and uncoated and coated carbon steel sheets. The results did show the influence of roughness, skewness, and anisotropy of surface topography. The findings could be explained by the theory of pad bearings. A new functional 3D parameter (Sq>0) was developed for pressing performance that is sensitive to the effects of roughness and skewness. The texture-aspect ratio parameter (Str) was found to be correlated to the anisotropical behaviour of the frictional response. The results are very tangible and mean increased control of stamping operations. An initial step was taken to introduce more advanced tribological models in FE simulation of sheet metal forming operations. The aim is to decrease the trial-and-error time in the design process of dies and tools. A friction model considering surface topography (Sq>0), sliding velocity, lubricant viscosity, and apparent pressure, was successfully implemented. Simulations of a part were evaluated with real stamping tryouts. The results did show the potential of improving the precision in forming simulations with more advanced tribological models. Finally, theory and characterisation methods of active micro-oil pockets in the contact zone of tool and sheet were investigated. The real contact area was shown to be the critical feature to determine. Therefore, two topographical methods and one microscope-imaging processing technique were studied, but no method was found to be viable. However, the experimental results did not confirm the importance of microoil pockets in mixed lubricated regime.

Ort, förlag, år, upplaga, sidor
Göteborg: Chalmers tekniska högskola, 2006. s. 72
Serie
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2526
Nyckelord
steel sheet, tribology, surface topography
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:hh:diva-2010 (URN)2082/2405 (Lokalt ID)91-7291-844-6 (ISBN)2082/2405 (Arkivnummer)2082/2405 (OAI)
Disputation
(Engelska)
Tillgänglig från: 2008-10-06 Skapad: 2008-10-06 Senast uppdaterad: 2018-03-23Bibliografiskt granskad

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Wiklund, DanielRosén, Bengt-Göran

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