Parametric optimization of burr height reduction and machining time in drilling operation on stainless steel specimen

Drilling is one of the conventional methods of producing a hole of the desired shape by removing material with the help of a cutting tool named drill bit. The process of drilling a hole usually leaves behind an undesirable burr at the exit surface of the workpiece. In this experimental work, the design of experiment (DOE) has been carried out as per Taguchi's L27 orthogonal array with an objective to minimize the height of burr (exit side) of stainless steel (SS) workpieces. The effect of process parameters like varied cutting speed, changes in feed and cutting fluid on burr height as well as machining time has been explored and the optimum condition for minimizing burr height under normal condition, using adhesive and with a backup support is determined by the entire experimental analysis. Response surface methodology and analysis of variance (ANOVA) have been performed to find out the optimum process parameters on burr height and machining time. With the progress of experiment, it has been observed that burr height is greatly influenced by the variation of speed, feed and cutting fluid whereas, cutting fluid has less impact on machining time reduction as compared to the varied speed and feed with adhesive and backup material condition. (paper)