Drilling is the most widely used machining process to create cylindrical holes in all materials by drill bits. Since the geometry of twist drill is quite complicated the metal drilling operations are also complicated such that drilling operations are affected from different parameters and conditions.
The drilling and drill bit parameters evaluated are cutting speed, feed rate, helix angle and point angle, while drill size and, specimen material are kept constant. A series of experiments are conducted using drilling machine to relate the cutting parameters and material parameters on the thrust force and torque.
This research outlines the Taguchi optimization methodology, which is applied to optimize cutting parameters in drilling of sample AISI 1040. Design of experiments was planned as L27 orthogonal array. Signal-to-noise ratio and Analysis of Variance (ANOVA) as a statistical analysis are used to study the effect of process parameters on machining process and to analyse the influence of these parameters on cutting force and torque. This procedure eliminates the need for repeated experiments, and also save the time and material wasting by the conventional experimental procedure.
This paper deals with investigation of optimising the drilling parameters together with geometry of twist drill in order to minimize thrust force and torque in drilling. A considerable reduction has been observed in the trust force and torque for the optimized drills and drilling parameters.
Among the all-significant parameters, feed rate and drill size are more significant effect on cutting thrust and torque than the cutting speed.