TOOL WEAR ANALYSIS DURING TURNING WITH SINGLE AND DUAL SUPPLY OF LN2

In the presented research work, LN2 supplied directly at rake face and in another localised machining condition, LN2 supplied at rake and flank face simultaneously. The DoE of performance of experiments was in accordance with Taguchi S/N ratio L-18. It was found that flank wear length and crater wear width at LN(2 )supply at rake & flank face simultaneously declined by 23-38% and 20-30% respectively as compared to LN2 supply at rake face only. ANOVA gave the highest effect of contribution in the percentage to LN2 supply at rake & flank face simultaneously as 76.06% and 77.67%, next in decreasing order followed by speed, feed and depth of cut. SEM images depicted that flank wear length and crater wear width in both machining conditions. Tool wear was low during turning LN(2 )supply at rake and flank face. Optimized values of each response was confirmed by repeating the experiments.