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Wear in sheet metal forming
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
2008 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The general trend in the car body manufacturing industry is towards low-series production and reduction of press lubricants and car weight. The limited use of press lubricants, in combination with the introduction of high and ultra-high strength sheet materials, continuously increases the demands of the forming tools. To provide the means of forming new generations of sheet material, development of new tool materials with improved galling resistance is required, which may include tailored microstructures, introducing of specific(MC, M(C,N))carbides and nitrides, coatings and improved surface finish. In the present work, the wear mechanisms in real forming operations have been studied and emulated on a laboratory scale by developing a test equipment. The wear mechanisms identified in the real forming process, were distinguished into a sequence of events consisting of initial local adhesive wear of the sheets resulting in transfer of sheet material to the tool surfaces. Successive forming operations led to growth of the transfer layer and initiation of scratching of the sheets. Finally, scratching changed into severe adhesive wear, associated with gross macroscopic damage. The wear process was repeated in the laboratory test-equipment in sliding between several tool materials, ranging from cast iron to conventional ingot cast tool steels to advanced powder metallurgy tool steel, against dual-phase carbon steel sheets. By use of the test-equipment, selected tool materials were ranked regarding wear resistance in sliding against ferritic-martensitic steel sheets at different contact pressures.

Wear in sheet metal forming is mainly determined by adhesion; initially between the tool and sheet surface interaction and subsequently, after initiation of material transfer, between a sheet to sheet contact. Atomic force microscopy force curves showed that adhesion is sensitive to both chemical composition and temperature. By alloying of iron with 18wt.% Cr and 8wt.% Ni, alloying in itself, or changes in crystal structure, led to an increase of 3 times in adhesion at room temperature. Hence, alloying may be assumed a promising way for control of adhesive properties. Additionally, frictional heating should be controlled to avoid high adhesion as, generally, adhesion was found to increase with increasing temperature for all investigated materials.

sted, utgiver, år, opplag, sider
Karlstad: Karlstad University , 2008. , s. 34
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2008:10
Emneord [en]
Friction, Sheet metal forming, Galling
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-1592ISBN: 978-91-7063-168-9 (tryckt)OAI: oai:DiVA.org:kau-1592DiVA, id: diva2:5516
Presentation
2008-04-18, 10:15
Opponent
Veileder
Tilgjengelig fra: 2008-04-17 Laget: 2008-04-17 Sist oppdatert: 2011-11-24
Delarbeid
1. Wear mechanisms in deep drawing of carbon steel: correlation to laboratory testing
Åpne denne publikasjonen i ny fane eller vindu >>Wear mechanisms in deep drawing of carbon steel: correlation to laboratory testing
2008 (engelsk)Inngår i: Tribotest, ISSN 1354-4063, Vol. 14, nr 1, s. 1-9Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
Wiley, 2008
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-2012 (URN)10.1002/tt.49 (DOI)
Tilgjengelig fra: 2008-11-19 Laget: 2008-11-19 Sist oppdatert: 2015-12-22bibliografisk kontrollert
2. Comparison of two test methods for evaluation of forming tool materials
Åpne denne publikasjonen i ny fane eller vindu >>Comparison of two test methods for evaluation of forming tool materials
Vise andre…
2008 (engelsk)Inngår i: Tribotest, ISSN 1354-4063, Vol. 14, nr 2, s. 147-158Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
John Wiley & Sons, 2008
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-2013 (URN)10.1002/tt.54 (DOI)
Tilgjengelig fra: 2008-11-19 Laget: 2008-11-19 Sist oppdatert: 2015-12-22bibliografisk kontrollert
3. Galling resistance and wear mechanisms - cold work tool materials sliding against carbon steel sheets
Åpne denne publikasjonen i ny fane eller vindu >>Galling resistance and wear mechanisms - cold work tool materials sliding against carbon steel sheets
2007 (engelsk)Inngår i: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 26, nr 1, s. 67-72Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
Berlin: Springer Berlin/Heidelberg, 2007
HSV kategori
Identifikatorer
urn:nbn:se:kau:diva-2014 (URN)10.1007/s11249-006-9186-5 (DOI)
Tilgjengelig fra: 2008-11-19 Laget: 2008-11-19 Sist oppdatert: 2017-12-07bibliografisk kontrollert
4. Experimental study of the relationship between temperature and adhesive forces for low-alloyed steel, stainless steel and titanium using atomic force microscopy in ultra-high vacuum
Åpne denne publikasjonen i ny fane eller vindu >>Experimental study of the relationship between temperature and adhesive forces for low-alloyed steel, stainless steel and titanium using atomic force microscopy in ultra-high vacuum
Vise andre…
2008 (engelsk)Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, ISSN 0021-8979, Vol. 103, nr 12, artikkel-id 124301Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
AIP, 2008
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-2015 (URN)10.1063/1.2938844 (DOI)
Tilgjengelig fra: 2008-11-19 Laget: 2008-11-19 Sist oppdatert: 2017-12-07bibliografisk kontrollert
5. Tribology in sheet metal forming: a literature review
Åpne denne publikasjonen i ny fane eller vindu >>Tribology in sheet metal forming: a literature review
(engelsk)Manuskript (Annet vitenskapelig)
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-2016 (URN)
Tilgjengelig fra: 2008-04-17 Laget: 2008-04-17 Sist oppdatert: 2011-11-24bibliografisk kontrollert

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