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Model for forces on a cutting tooth of a circular saw blade for wood rip sawing
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknologi.ORCID-id: 0000-0002-0145-080X
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
2011 (Engelska)Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Abstract [en]

Forces from cutting appear on the front edge and side edges of a straight cutting tooth of a circular saw blade intended for rip sawing of wooden logs. The forces on these three edges add up to a net force on the tooth with three components in the main, normal and lateral directions. Especially the net lateral force is interesting for the stability of a circular saw blade during rip sawing due to the low stiffness of the saw blade in the lateral direction. In this paper, a model for calculating the net force on a cutting tooth is proposed and discussed. The forces on the front cutting edge and the two side cutting edges may for each edge be calculated from literature and experimental data of main and normal forces as a function of cutting parameters such as rake angle, clearance angle, bevel angle, cutting depth and wood cutting direction. The net force is the vectorial sum of the forces on the front and side cutting edges. Thin saw blades cut relatively more with the side edges than thick saw blades for the same cutting depth.A net lateral force appears on the tooth if there are unequal normal forces on the side edges. The reasons for unequal normal forces may be unequal side cutting depths due to a lateral deflection of the saw blade or inhomogenities in the wood material. The net cutting forces from the cutting force model may be applied on the teeth of a mechanical model of the circular saw blade in order to calculate lateral displacements and thus stability of the circular saw blade. Lateral displacement of the saw blade generates unequal side edge cutting forces and thus there is coupling between lateral force and lateral deflection.

Ort, förlag, år, upplaga, sidor
2011.
Nationell ämneskategori
Annan maskinteknik
Forskningsämne
Träteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-34296Lokalt ID: 8761cbdd-67de-4798-ae6c-3f9ad3fcc368OAI: oai:DiVA.org:ltu-34296DiVA, id: diva2:1007546
Konferens
International Wood Machining Seminar : 07/06/2011 - 10/06/2011
Anmärkning
Godkänd; 2011; 20110617 (matse)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad

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Ekevad, MatsAxelsson, AnnCristovao, Luis

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TräteknologiInstitutionen för teknikvetenskap och matematik
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