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.
SpråkEngelska
Publiceringsdatum10 jun 2011
Sidantal7
StatusPublicerat

Konferens

KonferensInternational Wood Machining Seminar
Nummer20
LandSverige
OrtSkellefteå
Period07/06/1110/06/11
Internetadresshttp://www.ltu.se/research/subjects/Trateknik/Konferenser/20th-International-Wood-Machining-Seminar

Evenemang (konferens etc.)

International Wood Machining Seminar

jun. 07 2011 - jun. 10 2011

Skellefteå, Sverige

Evenemang (konferens etc.): Konferens