Experimental Analysis of Milling of Inconel 600 Using Vegetable-Based Cutting Oil with Boric Acid Nano Additives

Inconel 600 is a nickel-chromium alloy, which is suitable for high corrosion and heat resistance applications. This nickel-chromium alloy has outstanding mechanical properties and composes the best workability and high strength combination. Usage of super alloys like Inconel 600 has become a trend nowadays due to the high strength attained with the production of low-weight products. At present days, mostly mineral oils are used while machining to reduce the temperature of the work piecetool interface. Whereas, the usage of mineral oils causes damage to operators as well as the environment. This mineral oil when exited into the environment it does not get decomposed easily. It also causes respiratory problems to the operators. So, vegetablebased cutting oil can be replaced instead of mineral oil. The present paper deals with such vegetable-based cutting oil and is used for milling Inconel 600 superalloy. Milling experiments were carried out with PVD TiAlN coated carbide inserts in a CNC milling machine. The experiments were conducted with varying speed (1200, 1400, 1600 rpm), feed rate (100, 130, 150 mm/min) and depth of cut (0.15, 0.20, 0.25 mm). Three conditions (dry, wet, wet with additives) were employed. So, a total of 27 experiments were performed. Tool wear and surface roughness were compared for the three conditions. For finding the optimum milling condition Taguchi optimization technique was employed. The vegetable-based cutting oil was added with 1 wt. % boric acid nanoparticles. Tool wear was found best optimal for wet with additives along with 1200 rpm, 100 mm/min, 0.15mm condition. Surface roughness was best suited for wet with additives along with 1400 rpm, 130 mm/min, and 0.20 mm conditions. So, adding nano-additives with coconut oil was found useful as a cutting oil for milling Inconel 600.