Study of the physical properties of Corymbia citriodora wood for the prediction of specific cutting force

Abstract

ResumoObjetivou-se verificar a influência da densidade e da umidade da madeira na energia específica de corte. Utilizou-se madeira de Corymbia citriodora Hill & Johnson, de plantios no Vale do Rio Doce, no Brasil. Retirou-se a tábua diametral de 60 x 18 x 5 cm (comprimento x largura x espessura, respectivamente), acima de 1,3 m do solo. Nos ensaios de usinagem, utilizou-se serra circular de 400 mm de diâmetro com 24 dentes "WZ", velocidade de avanço de 10 m.min -1 , velocidade de corte 61 m.s -1 e torque instantâneo máximo de 92,5 N.m. Durante os cortes foram retirados corpos de prova com aresta de 1,5 cm alternado e paralelo a cada corte, em 6 posições radiais, que foram usados para a determinação da umidade e densidade da madeira. Observou-se que a energia especifica de corte foi positivamente correlacionada com a densidade da básica e aparente da madeira, porém a umidade foi negativamente correlacionada com a energia de corte. A densidade básica foi a propriedade física que melhor explicou a variação da energia específica de corte. A umidade demonstrou ser uma propriedade importante para explicar a relação entre a energia específica de corte específica e a densidade aparente da madeira.Palavras-chave: usinagem da madeira, umidade, densidade da madeira. AbstractThe aim of this study was to verify the influence of wood density and moisture content on specific cutting force. We used wood from the species Corymbia citriodora Hill & Johnson, from tree plantations in the Vale do Rio Doce, Brazil. A diametrical board with dimensions of 60 x 18 x 5 cm (length x width x thickness, respectively), more than 1.3 m from the ground, was removed. In machining trials, a 400 mm diameter circular saw was used, with 24 "WZ" teeth, feed rate of 10 m.min -1 , cutting speed of 61 m.s -1 , and maximum instantaneous torque of 92.5 N.m. During cutting, test specimens were removed with alternate and parallel 1.5 cm edges in 6 radial positions, which were used for determination of moisture, and wood density. It was observed that the specific cutting force was positively correlated with apparent density and with the basic density of the wood; however the moisture content was negatively correlated. The basic density was the best property indicated for the prediction of specific cutting force. Moisture content proved to be an important property for explaining the correlation found between specific cutting force and the apparent density of the wood.

Wood Colorimetry for the Characterization of Amazonian Tree Species: A Subsidy for a More Efficient Classification

“…Knowing the wood density, one can make inferences regarding the beneficiation and specific cutting force (MELO et al, 2016), the physical (EVANGELISTA; COSTA, 2017) and mechanical properties (STANGERLIN et al, 2017) and consequently, assign the most proper end use of the wood, i.e. construction, floors production or furniture.…”

Revisiting the estimation of cutting power with different energetic methods while sawing soft and hard woods on the circular sawing machine: a Central European case

“…The widespread approach to determining the cutting power in a cutting process is a model, which is based on the specific cutting resistance k c (Böllinghaus et al 2009;Grzesik 2018;Manžos 1974;Melo et al 2016;Nascimento et al 2017;Naylor and Hackney 2013;Orlicz 1988;Pinkowski et al 2016). According to Orlicz (1988), the cutting power could be determined as:…”

Specific cutting energy of Eucalyptus wood with different densities

“…Knowledge the technological properties of a certain wood species is essential to obtain products with characteristics suitable for the intended use and to predict the wood behavior during its processing, as a way of guarantee the control of the entire process (Melo et al, 2016;Taques & Arruda, 2016).…”