Moisture content of wood and cutting power in the up milling are correlated significantly

Cleverson Pinheiro¹; Manoel Cléber de Sampaio Alves²; Simone Simões Amaral²; Marcos Valério Ribeiro²

¹ UNESP - FEG Guaratinguetá. IFSP, Campus Jacareí; ² UNESP - FEG Guaratinguetá

doi:10.20906/CPS/COB-2015-0227

Resumo

The surface quality machined wood suffers the influence of various factors, and among the main, the moisture content of this material stands out with one of the most difficult to be controlled because it consists of a hygroscopic material, having strong interaction with moisture from the environment around its. Different methods of measurement are used in the study of the influence of process variables on surface quality of wood, in academia, the method of mechanical contact is one of the most commonly used methodologies, however, for an application on an industrial scale, it is necessary to look for alternatives and/or helper methods that might indicate decreased quality of wooden surface, with higher speed and in real time. One alternative would be the use of indirect methods of measuring quality that correlate with any process variable, as for example, the study of the variation of the energy consumed during the machining process. Knowing that the surface quality machined wood suffers the influence of moisture content, objective with this work to was to analyze the possible correlation between different levels of moisture content from the wood of the species Pinus elliottii and the variation of the energy consumed during up milling. The samples of wood were packed in automatic greenhouses to obtain different levels of moisture content (varying between 8 to 21 percent). For machining the samples of evidence was used a machining center with numeric control that works solely with wood or materials with similar physical attributes. The machining center was equipped with a tungsten carbide cutter. The power consumed values were obtained instantly with the aid a module of channels of brand National Instruments. It was observed a statistically significant correlation, at a significance level of 5 percent, showing a trend of increase of power consumption during up milling with increasing moisture content, however obtained a coefficient Pearson correlation of 0.331 with p-value of 0.049.

Palavras-chave: Surface quality; Wood machining; Methods of measuring.