A newly-developed model for predicting cutting power during wood sawing with circular saw blades

In the classical approach, cutting forces and cutting power in sawing processes of orthotropic materials such as wood are generally calculated on the basis of the specific cutting resistance k c (cutting force per unit area of cut). For every type of sawing kinematics (frame saws, band saws and circ...

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Autores principales:	Orlowski,Kazimierz, Ochrymiuk,Tomasz
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2017
Materias:	Circular sawing machine cutting fracture mechanics fracture toughness modelling orthotropic material sawing process wood
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017000200003
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spelling	oai:scielo:S0718-221X20170002000032017-05-02A newly-developed model for predicting cutting power during wood sawing with circular saw bladesOrlowski,KazimierzOchrymiuk,Tomasz Circular sawing machine cutting fracture mechanics fracture toughness modelling orthotropic material sawing process wood In the classical approach, cutting forces and cutting power in sawing processes of orthotropic materials such as wood are generally calculated on the basis of the specific cutting resistance k c (cutting force per unit area of cut). For every type of sawing kinematics (frame saws, band saws and circular sawing machines) different empirical values of specific cutting resistance k c have to be applied. It should be emphasised that sources in the scientific literature and handbooks do not provide any information about wood provenance, nor about cutting conditions in which cutting resistance had been determined. In analyses of sawing processes in which the offcut is formed by shear, Atkins's ideas that all cutting forms a branch of elastoplastic fracture mechanics can be applied. Thanks to this modern approach it was possible to reveal, using experimental results data of fracture toughness and shear yield stresses of Polish pine (Pinus sylvestris), the significant effect of the raw material provenance (source of wood) on cutting power. In the common model for circular sawing machine kinematics, which is similar to metal milling, the sum of all uncut chip thicknesses of the all the teeth simultaneously engaged represented the mean uncut chip thickness. In this work predictions of the newly-developed model for the circular sawing machine are presented. In the model, beside uncut chip thicknesses changes, appropriate changes in shear yield stress and toughness with tooth/grain orientation have been taken into account. The conducted analyses have demonstrated that values of RMS of cutting power obtained with the new developed model are slightly larger than experimental values. On the other hand computed values of cutting power with the use of the mean uncut chip thicknesses in the model are a bit lower from the empirical one.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.19 n.2 20172017-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017000200003en10.4067/S0718-221X2017005000013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Circular sawing machine cutting fracture mechanics fracture toughness modelling orthotropic material sawing process wood
spellingShingle	Circular sawing machine cutting fracture mechanics fracture toughness modelling orthotropic material sawing process wood Orlowski,Kazimierz Ochrymiuk,Tomasz A newly-developed model for predicting cutting power during wood sawing with circular saw blades
description	In the classical approach, cutting forces and cutting power in sawing processes of orthotropic materials such as wood are generally calculated on the basis of the specific cutting resistance k c (cutting force per unit area of cut). For every type of sawing kinematics (frame saws, band saws and circular sawing machines) different empirical values of specific cutting resistance k c have to be applied. It should be emphasised that sources in the scientific literature and handbooks do not provide any information about wood provenance, nor about cutting conditions in which cutting resistance had been determined. In analyses of sawing processes in which the offcut is formed by shear, Atkins's ideas that all cutting forms a branch of elastoplastic fracture mechanics can be applied. Thanks to this modern approach it was possible to reveal, using experimental results data of fracture toughness and shear yield stresses of Polish pine (Pinus sylvestris), the significant effect of the raw material provenance (source of wood) on cutting power. In the common model for circular sawing machine kinematics, which is similar to metal milling, the sum of all uncut chip thicknesses of the all the teeth simultaneously engaged represented the mean uncut chip thickness. In this work predictions of the newly-developed model for the circular sawing machine are presented. In the model, beside uncut chip thicknesses changes, appropriate changes in shear yield stress and toughness with tooth/grain orientation have been taken into account. The conducted analyses have demonstrated that values of RMS of cutting power obtained with the new developed model are slightly larger than experimental values. On the other hand computed values of cutting power with the use of the mean uncut chip thicknesses in the model are a bit lower from the empirical one.
author	Orlowski,Kazimierz Ochrymiuk,Tomasz
author_facet	Orlowski,Kazimierz Ochrymiuk,Tomasz
author_sort	Orlowski,Kazimierz
title	A newly-developed model for predicting cutting power during wood sawing with circular saw blades
title_short	A newly-developed model for predicting cutting power during wood sawing with circular saw blades
title_full	A newly-developed model for predicting cutting power during wood sawing with circular saw blades
title_fullStr	A newly-developed model for predicting cutting power during wood sawing with circular saw blades
title_full_unstemmed	A newly-developed model for predicting cutting power during wood sawing with circular saw blades
title_sort	newly-developed model for predicting cutting power during wood sawing with circular saw blades
publisher	Universidad del Bío-Bío
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017000200003
work_keys_str_mv	AT orlowskikazimierz anewlydevelopedmodelforpredictingcuttingpowerduringwoodsawingwithcircularsawblades AT ochrymiuktomasz anewlydevelopedmodelforpredictingcuttingpowerduringwoodsawingwithcircularsawblades AT orlowskikazimierz newlydevelopedmodelforpredictingcuttingpowerduringwoodsawingwithcircularsawblades AT ochrymiuktomasz newlydevelopedmodelforpredictingcuttingpowerduringwoodsawingwithcircularsawblades
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A newly-developed model for predicting cutting power during wood sawing with circular saw blades

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