Role of jet radius and jet location in cryogenic machining of Inconel 718: a finite element method based approach

摘要

Cryogenic cooling is attributed as a green option to counter the high temperatures developed in machining process. The parameters specific to the cryogenic cooling such as jet radius and jet location have controlling influence on the machining performance. Inconel 718 is one of the most prominent aeronautic alloys, mainly used in the aerospace industry due to its high strength and ability to retain properties at very high temperatures. Inconel 718 is a hard to cut material due its low thermal conductivity and work hardening behavior. The present study that investigates the impact of cryogenic cooling using liquid nitrogen coolant on orthogonal turning of Inconel 718 for different values of jet radius, jet location and cutting speeds. The study incorporated a finite element model to simulate the different machining test conditions. The virtual assessment of cryogenic cutting process is beneficial for the decision making that how these parameters can contribute towards final decision making. The dissipation of heat at cutting edge and presence of jet of cryogenic coolant was simulated and analyzed for different jet radii, jet locations and cutting speeds. The study detected shear angle and evaluated chip compression ratio to understand the plastic deformation and related effects. The study revealed that cutting temperature decreased with increasing flow of LN2 at the cutting edge while the cutting force increased with high flow of coolant.