TOOL LIFE AND SURFACE INTEGRITY WHEN MILLING INCONEL718 WITH COATED CEMENTED CARBIDE TOOLS

This paper presents a study of tool life and surface integrity while machining superalloy Inconel 718 using coated cemented carbide tools. In the machining of heat resistant superalloys used in aeronautical applications and classified as difficult-to-machine, tool life is an important parameter in evaluating the performance of the cutting tools. Surface quality of the workpiece is one of the important criteria in determining tool life. Our tests have been done under various combinations of speed, feed rate, and depth of cut to verify the change in surface roughness due to increasing tool wear. The behavior of the uncoated, TiN, and TiCN layers using various cutting conditions was analyzed. At the end, a choice of coating and optimization of the cutting conditions has been proposed.