Influência da velocidade de corte no desgaste da serra circular durante serramento de tubos de ferro fundido cinzento

Abstract

This Master's thesis in Mechanical Engineering investigates the influence of cutting speed on the wear of circular saws during the sawing of gray cast iron pipes, a material widely used in the manufacture of cylinder liners. This study investigates how variations in cutting speed impact the wear of the circular saw, seeking to understand the wear behavior and the wear curve. Sawing tests were conducted under three distinct speed conditions (130, 150, and 170 m/min), using saws with tungsten carbide teeth and PVD coating, monitoring the maximum flank wear (VBmax). Analyses were performed using digital and scanning electron microscopy, complemented by energy dispersive spectroscopy (EDS), and statistical evaluation of the results through Analysis of Variance (ANOVA). The results showed that the cutting speed exerts a statistically significant influence on the wear of the circular saw. It was observed that the 130 m/min cutting speed showed greater stability and yield, achieving 14 square meters of sawn material; the 150 m/min speed resulted in 7 square meters, and the 170 m/min speed in 4.5 square meters of cut. At higher cutting speeds, there was an intensification of wear, associated with mechanisms such as adhesion, abrasion, chipping, and thermal cracking. Statistical analysis confirmed the relevance of this parameter in the progression of wear, with a significance level greater than 99.99%. Therefore, it is concluded that the appropriate selection of cutting speed is fundamental to optimizing the yield and stability of the sawing process, contributing to the scientific advancement of the area and to practical applications in industry. [resumo fornecido pelo autor]