Abstract
The development of surface roughness models for turning supermet 718 nickel super alloy (300 BHN), using different tool materials is studied. Cubic boron nitride (SANDVIK CB50), Carbide (SANDVIK H1P k10), and ceramic (SANDVIK CC680) were used under dry cutting conditions and a constant nose radius. The models are developed in terms of cutting speed, feed rate, and depth of cut. These variables were investigated using design of experiments and utilisation of the response surface methodology (RSM). A separate surface roughness model corresponding to each tool material is established, tested and reported. 14 refs.