Avaliação da influência dos parâmetros de corte e duas classes de ferros fundidos vermiculares na temperatura de usinagem

Abstract

The temperature achieved at the tool-chip interface is one of the main limiting factors of productivity in machining operations. Intensive research has been conducted over the past decades in order to improve understanding and modeling of the phenomena involved in metal cutting, especially in terms of heat generation and distribution. Although a precise approach on the temperatures along the cutting zone still remains a big challenge, given the inherent inaccessibility of that region, a refined knowledge on which variables have direct effects on cutting temperatures can lead to great optimization in industrial machining operations, improving productivity. This paper aims to identify such variables and analyze their impact on heat output and distribution. Amongst theory review, tests were performed in order to evaluate the average temperature near the cutting zone based on infrared thermal radiation measurement during the milling of cast irons with different mechanical properties. The results showed that cutting speed and work material shear resistance play major roles on temperature development during cutting process. Feed rate, depth of cut, tool geometry and the coefficient of friction between workpiece and tool materials are variables that also have influence on the machining temperatures.