ObjectiveSanding is a high-precision and efficient wood material processing technology. The study analyzed the wear mechanism of the abrasive belt during the sanding process and explored the effects of abrasive belt wear on the material removal rate and the sanded surface quality. And the aim is to further improve the basic theory of wood cutting and the development of advanced belt manufacturing technology, so as to realize the intelligence and automation of wood processing.
MethodIn this research, Manchurian ash (Fraxinus mandshurica) was used as experimental material. In order to analyze the effect of abrasive belt wear on material removal rate and surface roughness, the mass change and the surface morphology of the test piece were measured experimentally. The wear mechanism of the abrasive belt was explored by calculating the material removal rate and measuring the surface topography of the abrasive belt. In addition, the grey model was used to predict the quantitative relationship between sanding length and material removal rate, and also surface roughness.
ResultDuring transverse sanding process, the material removal rate was less than that of longitudinal sanding. Overall, the material removal rate and the quality of abrasive belt decreased with the increase of sanding times, and the surface roughness of the workpiece increased first and then decreased. During the sanding process, abrasive grains of abrasive worn, broken and peeled off, which resulted in the mass of abrasive belt decreasing and the height of abrasive grains tending to be the same.
ConclusionIn the sanding process, the abrasive wear caused by transverse sanding is greater than that caused by longitudinal sanding, and the material removal rate decreases with the increase of abrasive wear. When the material removal rate is reduced to 3%, it can be considered to end the service of the abrasive belt, which means the abrasive belt should be replaced in time. In the sanding process, the worse the contour of abrasive particles is, the higher the material removal rate is. With the increase of sanding times, the removal capacity of abrasive belt material decreases. The relative error of predictive average simulation using grey model mean GM (1,1) is within 20%, so it is suitable for predicting the relationship between sanding length and material removal rate, and also surface roughness in the process of sanding Manchurian ash.