Análise da influência de vibração na qualidade do corte do MDF em uma serra circular de bancada

Abstract

Mechanical vibrations are present in various equipment in the most diverse areas. In the table circular saw, the vibration of the blade used can cause low surface quality in the MDF cut, requiring a subsequent correction that increases costs and working time. The objective of the work is given by the numerical analysis of the natural frequencies and experimental analysis of the noise generated in the cutting process, in two commercial blades of 56 and 80 teeth. For the 56-tooth blade, an extra fixing support was developed, in the hypothesis of reducing damage known as washboards and making comparisons with the 80-tooth blade, indicated by the manufacturer for high surface quality, as well as low noise and low vibration. The 56-tooth blade without the developed holder showed intermediate results in terms of natural frequencies and generated noise, but the worst cut quality, possibly caused by a blade resonance condition. The support developed was able to improve the quality of the cut in the 56-tooth blade, but to the addition of noise in the work environment, caused by the contact between it and the bearings. It was possible to visualize higher values in the natural frequencies and different vibration modes generated. In turn, the 80-tooth blade, specific for cut quality, proved to be the best of the options compared to the other tests, combining cut quality with low noise. [resumo fornecido pelo autor]