Change search
ReferencesLink to record
Permanent link

Direct link
Tribology in Metal Working
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribomaterial)
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the tribological performance of tool surfaces in two steel working operations, namely wire drawing and hot rolling. In all forming operations dimensions and surface finish of the products are of utmost importance. Forming basically includes three parts – forming conditions excluded – that may be changed; work material, tool and (possibly) lubricant. In the interface between work material and tool, the conditions are very aggressive with – generally or locally – high temperatures and pressures. The surfaces will be worn in various ways and this will change the conditions in the process. Consequently, the surface finish as well as the dimensions of the formed product may change and in the end, the product will not fulfil the requirements of the customer. Therefore, research and development in regard to wear, and consequently tribology, of the forming tools is of great interest.

The investigations of wire drawing dies focus on coating adhesion/cohesion, surface characteristics and material transfer onto the coated steel both in laboratory scale as well as in the wire drawing process. Results show that it in wire drawing is possible to enhance the tribological performance of drawing dies by using a lubricant together with a steel substrate coated by a polished, dual-layer coating containing both hard and friction-lowering layers.

The investigations of hot rolling work rolls focus on microstructure and hardness as well as cracking- and surface characteristics in both laboratory scale and in the hot strip mill. Results show that an ideal hot work roll material should be made up of a matrix with high hardness and a large amount of complex, hard carbides evenly distributed in the microstructure. The surface failure mechanisms of work rolls are very complex involving plastic deformation, abrasive wear, adhesive wear, mechanical and thermal induced cracking, material transfer and oxidation.

This knowledge may be used to develop new tools with higher wear resistance giving better performance, lower costs and lower environmental impact.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, Department of Engineering Sciences , 2012. , 52 p.
Keyword [en]
Tribology, friction, wear, metal working, coatings, wire drawing, hot work rolls
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Engineering Science with specialization in Tribo Materials
URN: urn:nbn:se:uu:diva-187084OAI: diva2:573742
2012-12-14, Clas Ohlson, Skomakargatan 1, Borlänge, 13:00 (Swedish)
Available from: 2012-12-07 Created: 2012-12-03 Last updated: 2013-04-23Bibliographically approved

Open Access in DiVA

fulltext(1790 kB)225 downloads
File information
File name FULLTEXT01.pdfFile size 1790 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Nilsson, Maria
By organisation
Applied Materials Sciences
Manufacturing, Surface and Joining TechnologyMetallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 228 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 608 hits
ReferencesLink to record
Permanent link

Direct link