ON THE INFLUENCE OF PROCESSING CONDITIONS ON SURFACE ROUGHNESS FOR MILLING TITANIUM ALLOYS WITH HSS TOOLS

摘要

This paper presents a study on the development of a surface roughness model of milled parts made of Ti-6A6-4V ELI alloy with HSS tool. The model is developed considering depth of cut, cutting speed and feed rate as input variables. Machining tests, based on design of experiments, were carried out with HSS 8% Cobalt cutting tool under various conditions for both plain and end milling. Second-order models predicting equations for surface roughness have been established by using experimental data. The validity of the models is tested with analysis of variance and they are found to be adequate for this problem. The proposed equations show that feed rate was the main influencing factor for surface roughness. The predicted surface roughness of the samples has been found to lie close to that of the experimentally observed ones, for plain and end milling.