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Licensed Unlicensed Requires Authentication Published by De Gruyter October 19, 2013

A theoretical and experimental study of the circular sawing process

Lisbeth M. Hellström, Sven-Olov Biller, Sverker Edvardsson and Per A. Gradin
From the journal Holzforschung

Abstract

To gain further insight into the energy dissipation during the wood sawing process, a theoretical model has been developed. The model is based on the assumption that there are two basic causes for energy dissipation during sawing: the creation of a new surface and the compression of material below a saw tooth. It is assumed that both contributions can be dependent on the cutting angle (the angle between the fiber direction and the tangent to the path followed by a saw tooth) because a saw tooth changes its angle of attack during its way through a log. To determine this dependence of the dissipation on the cutting angle, a series of experiments with pine plank sawing were performed by means of different feeding rates and cutting angles while the electrical power supplied to the saw was measured. The parameters in the theoretical model were derived from the experimental findings. Finally, two tests were carried out under different conditions with respect to thickness and cutting angles and the validity of the model was confirmed concerning the prediction of the electrical power consumption.


Corresponding author: Lisbeth M. Hellström, Fibre Science and Communication Network, Department of Natural Sciences, Mid Sweden University, Holmgatan 10, SE-851 70 Sundsvall, Sweden, e-mail:

Lee Kristoffer Kramberg at Andritz Iggesund Tools AB is greatly acknowledged for his assistance and support during the sawing trials.

Appendix

I0=NTRbβ2π(-cos(ϕ1)+cos(ϕ0))=NTbhβ2πI1=NTRbβ2π(-ϕ1cos(ϕ1)+ϕ0cos(ϕ0)+sin(ϕ1)-sin(ϕ0))I2=NTRbβ2π((2-ϕ12)cos(ϕ1)+(2-ϕ02)cos(ϕ0)+2(sin(ϕ1)-sin(ϕ0)))J0=NTRbω2π(ϕ1-ϕ0)J1=NTRbω4π(ϕ12-ϕ02)J2=NTRbω6π(ϕ13-ϕ03)

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Received: 2013-4-17
Accepted: 2013-9-24
Published Online: 2013-10-19
Published in Print: 2014-4-1

©2014 by Walter de Gruyter Berlin/Boston

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