Influence of Tool Geometry on Self-feeding when Sawing Frozen Wood

Sawing during the cold winter period is a problem for sawmills operating in the northern parts of the world and is becoming an increasingly important economic factor. One common effect of processing frozen timber is poor barking leading to increased tool wear and decreased pulp-chip quality, which implies lower chip value. Other common effects in the conversion steps of a sawmill are sawdust attached to the surface of the sawn timber (sawdust gluing), knot rupture, tool breakdown, and self-feeding, i.e. the sawblade feeds the wood to be sawn more or less independent of the feeding equipment. This study deals with the self-feeding phenomenon and how this problem can be reduced by adapting tool parameters to the properties of the frozen wood material. The results show that the amount of sapwood in the sawn timber has a great influence on the amount of self-feeding and that the effect can be reduced by adapting the rake angle of the tool to the conditions of frozen timber. A bevel at the edges of the cutting teeth reduced self-feeding forces, but increased main cutting forces.

Ekevad, Mats,1956-Luleå tekniska universitet,Träteknik(Swepub:ltu)matse (författare)
Sandberg, Dick,1967-Luleå tekniska universitet,Träteknik(Swepub:ltu)dicsan (författare)
Luleå tekniska universitetTräteknik (creator_code:org_t)

Av författaren/redakt...: Marklund, Birger; Ekevad, Mats, 19 ...; Sandberg, Dick, ...

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