Relação do desgaste da ferramenta de corte com a qualidade superficial da madeira usinada

Abstract

Understanding the behavior of wood is essential for achieving greater control over the machining process and, consequently, obtaining adequate surface quality. Therefore, the present study aimed to analyze the surface based on surface roughness throughout the natural wear of the tool, monitor the sharpening life of the tool edge, and determine its critical point according to the need for rework. For this purpose, five types of wood were used and were subjected weekly to the cutting process with a new circular saw, whose edges were photographed at each cutting stage for later analysis of their angles. Surface quality was evaluated through roughness using the Ra parameter. The results show that for all evaluated species, as the cutting tool edges wear out, the machined wood surface quality decreases, as do the angle values of the tool edges, resulting in poorer surface quality. However, after sharpening the tool teeth, the tool once again provided low Ra values. In conclusion, the wear of the cutting tool influences the surface quality of the machined wood, the deterioration of the tool angle had a negative effect on the surface quality of the machined wood, and the critical sharpening point of the circular saw edges occurred between the 3rd and 4th evaluation based on the need for rework of the machined wood.