Experimental investigation of copper nanofluid based minimum quantity lubrication in turning of H 11 steel

Abstract

Plentiful supply of coolant might enhance the machining cost and also generates environmental hazard. As a result, substitute methods are required to eliminate the problems encountered during use of coolant. In this investigation, the impact of cutting speed, feed and lubrication conditions (dry: no lubrication, oil: machining is performed with groundnut oil and nano fluid: machining performed with copper nano fluid) on surface roughness, tool wear and chip morphology in turning of H 11 steel with minimum quantity lubrication (MQL) were examined. Experiments were conducted using L 18 orthogonal array. The results reveal that copper nanofluids with MQL provide a substitute for dry and oil machining. Response surface methodology has been used to derive optimal values and mathematical models. Tool wear was reduced by 66% and surface roughness by 40% while machining with copper nano fluids. The surface roughness and tool wear were decreased under optimal machining conditions. Generation of large notched tooth in chips has been minimised with copper nano fluids. Furthermore, the morphology of the chips were analysed for dry, oil and nano fluid under scanning electron microscope to observe the texture created.

Evaluation of graphene based nano fluids with minimum quantity lubrication in turning of AISI D3 steel

“…Also, in dry cutting colour obtained in the chip are blue indicating a high temperature. These results in large serrated teeth generated [31] as shown in Fig. 11a.…”

“…1b. The sodium dodecylbenzenesulfonate (SDBS) was employed as surfactant to improve the solidity of the nanofluids [31]. The synthesized nanofluids found to be steady were validated through Scanning electron microscope (SEM) images ( Fig.…”

“…The temperature generated is 47 °C (Table 4) which is 32% high with oil condition under optimal trial and 53% high with optimal trail under nanofluids. With oil under optimal conditions, the unsaturated bonds naturally exist in vegetable oil in huge quantity and these acts as boundary at the tool-chip interface in minimizing the temperature [31]. Further, MQL provide good lubrication at the machining interface which paves a way in reducing the temperature [46].…”

“…12b. It shows that increase in cutting speed decreases the surface roughness [31,57]. Throughout machining, built-up-edges (BUE) were developed which spoil the machined surface.…”

“…Sharma et al [30] noted that using alumina/graphene hybrid nano particles minimizes the friction coefficient and wear in turning AISI 304 due to enhanced wettability action of nano fluids. Ganesan et al [31] used copper nano fluids with MQL in turning H11 steel. They identified copper nano fluids provide a substitute to other cutting fluids by minimizing surface roughness and tool wear.…”