Influência da geometria do dente na qualidade de corte de uma serraria no Norte de Mato Grosso

Abstract

The present study aimed to determine the quality and productivity of sawn wood when subjected to two teeth geometries of a band saw blade, with emphasis on the variation in sawdust (St). During a period of work, with the so-called traditional band saw blade currently used by the sawmill, the design of the teeth was collected on graph paper, to obtain the following data: tooth pitch, angles of attack, cut and incidence, tooth height and tooth throat area. In addition, the cutting speed during the splitting of each log and the thickness of the sawn boards were collected, calculating the advance speed and variation in sawing, respectively. With this, calculations were made of the cutting height that the current blade was capable of sawing, and the necessary changes were made to the tooth so that the tooth geometry was ideal for the cutting height of the sawmill. Therefore, the geometry of the teeth was changed and the results obtained between the two tooth models were compared. After analyzing the results, it was concluded that the proposed model (MP) obtained better results in terms of sawdust variation and increased cutting height that the band saw could cut. The advance speed was higher compared to the traditional model (MT), but the diameter of the logs that the MP cut was larger, affecting the advance speed. In this way, changes to more suitable tooth geometries provided improvements in cutting quality and sawmill productivity.