Sound Pressure as a Tool in the Assessment of the Surface Roughness on Medium Density Fibreboard Rip Sawing Process

Abstract

This research takes the option of using sound pressure signals to monitor the resulting surface roughness from rip sawing process of medium density fibreboards samples. Different cutting conditions were evaluated, namely cutting speed and feed, giving as a variable the mean chip thickness, being also assessed the effect of the climb cutting and conventional cutting mode. The main results lead to conclude that the sound pressure was closely related to the variation of the mean chip thickness giving adequate levels of correlation with the surface roughness. A positive, linear relationship was observed between feed rate and surface roughness, as well as for sound pressure. The best surface quality was achieved when climb cutting mode was applied. Then, the measurement of sound pressure results is a useful method to monitor MDF cut process, being possible to predict the surface roughness, as well as the effect of the change of cutting conditions. Keywords: Sound pressure, circular saw, MDF, surface roughness. RESUMENEsta investigación considera la opción de usar las señales de presión de sonido para monitorear la rugosidad superficial resultante del proceso de corte longitudinal con sierra circular de paneles de densidad media. Se evaluaron diferentes condiciones de corte, en particular la velocidad de corte y de avance, entregándose como variable el espesor medio de viruta, también se estudió el efecto del modo de corte convencional o concordante. Los principales resultados indican que la presión de sonido se correlacionó muy bien tanto con la variación del espesor medio de viruta como con la rugosidad superficial. Una relación lineal positiva se observó tanto entre la tasa de alimentación y la rugosidad, como también con la presión de sonido. La mejor calidad de superficie se obtuvo con el modo de corte en concordancia. Los resultados de la medición de presión de sonido son un método útil para controlar el proceso de corte de MDF, siendo posible predecir la rugosidad superficial y el efecto del cambio de las condiciones del proceso. Palabras clave: Presión de sonido, sierra circular, MDF, rugosidad superficial.

Accuracy of the pneumatic follower for the wooden surface quality assessment

“…Because of the need of non-contact measurement, the automatic measurement based on laser imaging was proposed (Hu and Afzal 2005). Aguilera and Barros (2010) suggested to analyze the sound pressure in order to assess and predict the surface roughness. Other authors reported good correlation between results of the contact measurement with stylus and 3D scanning of a wooden surface (Zhong et al 2013).…”