Sirsendu Mahata

Effect of fluid concentration using a multi-nozzle on grinding performance

Grinding fluid, apart from controlling temperature produced at the wheel-work contact zone by way of cooling also helps in lubrication which is achieved by reduction of friction at the wheel-workpiece interface. In the present experimental investigation, grinding fluid is delivered into the grinding zone by a multi-nozzle system in order to determine grindability of low alloy steel at different fluid concentrations. A comparative study has been made among dry and wet grinding using three different coolant concentrations, considering various response parameters, to assess grinding performance at a particular in feed. It is found that high concentration of oil in the fluid produced good results in terms of force requirement and surface roughness.

Grinding of Inconel 718 Using Soap Water Jet and Liquid Carbon Dioxide

In aerospace and petrochemical sectors, Inconel is a highly important material used extensively, on account of its superior properties. Grinding of this Nickel based alloy is, however, difficult due to high wheel loading, high grinding temperature and large force requirement per unit volume of material removed. Grinding fluid can reduce these adverse effects to some extent, but environmental regulations and high disposal costs limit the extent of its usage. In this experimental work, surface grinding of Inconel 718 is performed under dry, a jet of soap water and liquid carbon-di oxide assisted soap water condition. Experimental results show that using soap water jet, significant increase of grinding ratio by 35% can be obtained, as compared to dry grinding. Grinding with liquid CO2 assisted soap water leads to 26% increase of G-ratio only. Wheel loading is considerably reduced in both cases of soap water. Moreover, ground surface hardness decreases by 15% when using soap water. Thus, relative ease of grinding of the Nickel base alloy, Inconel 718 with the application of soap water in the form of a jet can be concluded, thereby indicating its applicability in industry.