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Wear of timber cutting saw teeth
2002 (English)Other (Other (popular science, discussion, etc.))
Abstract [en]

Bandsaw blades are frequently used in the sawmill industry for timber cutting. The saw teeth are gradually worn during cutting and will finally cause unacceptable surface roughness and dimensional deviations on the sawn wood product. Maintenance by resharpening of the saw teeth is therefore necessary after a certain time of sawing.



The aim of this work is to build up a fundamental understanding of the damage mechanisms that occur on saw teeth during cutting of timber. On this basis, an improved wear resistant saw tool system may be developed.



Saw tooth wear influenced by cutting parameters as cutting speed and tooth bite has been evaluated. Also, different saw tooth materials have been examined. The wear has been characterised and evaluated.



In this thesis the following findings are presented.



" An experimental method has successfully been used, where wear on timber cutting saw teeth can be simulated. A test time of 30 minutes is comparative to 8 hours cutting in sawmill.

" During the initially high wear rate stage microfractures and chipping damages dominate, while in the low wear rate stage abrasive and tribochemical wear dominate.

" For swaged saw teeth of saw steel, high cutting speeds decrease the wear rate causing more abrasive wear. Tribochemical mechanisms are controlling at low cutting speeds causing higher wear rate.

" An optimal mixture of carbide size, carbide amount and binder composition is important for wear resistance of Co-based alloys used in timber cutting applications.

Place, publisher, year, edition, pages
Karlstad: Karlstad University Studies , 2002.
Identifiers
URN: urn:nbn:se:kau:diva-25709ISBN: 91-85019-05-4OAI: oai:DiVA.org:kau-25709DiVA: diva2:599488
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2013-01-22

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