42. Experimental Investigation of Nano-Graphite Cutting Fluid on EN-8 Steel Using Eco-friendly Oils with MQL Process

Nowadays, in industries cutting fluids are widely used for reduction of friction between tool and workpiece. During dry cutting, the workpiece is machined under the influence of dry condition in which air surrounding the workpiece will act as the cooling agent. Since air has a low thermal conductivity, it behaves as a poor coolant. In wet cutting, the workpiece is under wet condition. The most cutting fluid constitutes 95% of water and 5% of coolant. Due to the usage of cutting fluid, they will give a notable change in various properties like thermal, surface roughness, tool wear, and tool and workpiece temperatures. The prudent properties of such type of fluids are to inflate heat transfer, lubrication, and removal of chips from machining zone. Eco-friendly oils are mainly used in metal working fluids to reduce the various unwanted risks like health and wastage of money. Minimum quantity lubrication (MQL) is a process in which hackneyed of cutting fluids is avoided and excellent surface integrity obtained by dry machining. It only needs a fluid with properties like large heat-carrying capacity and inflate lubricating characteristics. The present work investigates the usage of nano-graphite with eco-friendly oils like coconut oil, sesame oil, mustard oil, and soluble coolant oil as cutting fluid in the machining. Various characteristics like tool wear, tool temperature, nature of chip produced, and surface roughness characteristics for various oils are investigated. MQL is environment friendly machining and enhances machinability characteristics of EN8 steel.