Experimental study on surface roughness of superalloy GH169 by dry turning with CBN cutting tools

Surface roughness of machined mechanical parts and components has significant influence on many performance characteristics of products such as wear resistance, corrosion resistance, and fatigue strength. The traditional machining of high-temperature alloy GH169 using cutting fluid pollutes the environment. Therefore, new cutting tool materials such as cubic boron nitride (CBN) have been used for dry machining of difficult-to-machine materials. In this paper, turning of GH169 by CBN cutting tools in dry condition is studied for sustainable manufacturing. Taguchi method is used to analyse the effect of turning parameters. Results reveal that the most significant parameter on surface roughness is feed rate followed by cutting speed, while depth of cut has a minor influence. Superior machined surface that could only be obtained traditionally by the grinding process can be reached by turning with the optimum cutting parameter combination recommended in this research.