Influence of wood modification on cutting force, specific cutting resistance and fracture parameters during the sawing p
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ORIGINAL
Influence of wood modification on cutting force, specific cutting resistance and fracture parameters during the sawing process using circular sawing machine Luďka Hlásková1 · Zdeněk Kopecký1 · Vít Novák1 Received: 18 November 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The aim of this study was to determine the cutting force and specific cutting resistance of modified beech wood (Bendywood, DMDHEU and Lignamon) and, based on experimental results, to calculate the fracture parameters for cutting in axial–perpendicular direction of these modified materials and to compare with native beech wood. In the conventional approaches, cutting force and cutting power in sawing processes of wood are generally calculated based on the specific cutting resistance, which is a function of many factors. A major deficit of these conventional methods is that they are not focusing on the physical and mechanical properties of wood. The influence of these factors is only taken into account by the coefficient of the tree species. In this work, predictions of the newly developed model for the circular sawing machine are presented. Thanks to this modern approach, it was possible to determine fracture toughness and shear yield strength of native beech wood and modified beech wood using experimental results, without performing complex fracture tests. Based on the experiments performed, it can be concluded that modifications have a partial degradation effect on wood properties. The fracture toughness and shear yield strength of the modified materials is not dependent on the density, but rather on the internal structure, extent of the degradation of the cell wall and the type of modification
1 Introduction Cutting of wood is one of the most widely used technologies for processing of native wood, wood-based materials and plastics using saw blades. This technology has been applied in the wood processing industry from primary processing to woodworking to final products and it can be assumed that new modified wood-based materials will be processed on existing woodworking machines and tools, so it is necessary to know their behavior during cutting. An important feature of the woodworking material is the cutting resistance (Böllinghaus et al. 2009). The size effect * Luďka Hlásková [email protected] Zdeněk Kopecký [email protected] Vít Novák [email protected] 1
Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemědělská 1/1665, 613 00 Brno, Czech Republic
of the cutting resistance is characterized by the woodworking process and is determined by the technological conditions of processing, machine and tool construction and the amount of consumed energy. In conventional approaches, the energy effects (cutting force and cutting power) are calculated mainly on the basis of specific cutting resistance (Fischer 2004; Orlowski 2007; Scholz et al. 2009), which is a function of the following factors in the case of woodworking processing, i.e. types of processed wood, fiber c
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