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Influence of microstructure on tool lifespan during circular sawing at Ovako AB
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The influence of microstructural variation on tool lifespan during circular sawing process at Ovako AB has been investigated for spheroidized SAE52100 steel. Several factors have been established as potential sources of variation on the lifespan of the saw blade, beside the microstructure, based on a theoretical background and on an evaluation of the production route. Much emphasis has been put on finding and controlling these factors in order to isolate the microstructural influence.

Initially data from the production was analysed followed by a controlled experiment. During the analysis of retroperspective data it was clear that data collected from production contained too much variation in order for a relationship between the microstructure and the tool lifespan to be distinguishable.

During the experiment, alterations in microstructure were achieved by varying the heat treating furnaces and the heat cycles during the heat treating process. The trials performed indicate that the amount of lamellar pearlite at the surface is influencing the saw-blade lifespan to a greater extent compared to the hardness in the middle of the tube wall. It is possible to heat treat the tubes in various way in order to increase the saw-blade lifespan during circular sawing. The observed variations in saw-blade lifespan, for the same orders, in the retroperspective analysis can to a large extent be explained with difficulties to asses when to replace the saw-blades.

Place, publisher, year, edition, pages
2015. , 45 p.
Keyword [en]
Microstructure, tool lifespan
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-182674OAI: oai:DiVA.org:kth-182674DiVA: diva2:905493
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2016-02-26 Created: 2016-02-22 Last updated: 2016-02-26Bibliographically approved

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