Optimization of thrust and torque forces of EN8 in drilling with HSS

Drilling is second largest operations in machining. There is extensive and ongoing research focused on developing advanced tools and technologies to maximize drilling rates. A drill bit is a tool that has cutting points that are used to make a hole in any solid material. The present study is considered non- coated drill bits of HSS. One significant disadvantage of this operation is the potential damages that can occur because of the forces generated during drilling of thrust force and torque. To estimate the influence of machining parameters spindle speed, feed rate and diameter of tool, on thrust and torque while drilling the solid materials. The material tested for its drilling performance. The effect of drilling process parameters will be explored to acquire the desired value of machining performances i.e. thrust force and torque. Significance of each parameter analyzed from experimental outcomes. The outcomes of result is optimized by using Taguchi technique. The feed rate was identified to be the most important process parameter affecting the drilling performance of EN8 steel for both thrust force (41.19%) and torque (48.02%) contribution. Meanwhile, spindle speed had the least contribution to the drilling process. The combination of 250 spindle speed, 0.285 feed rate, and 12 mm diameter of the drill bit was identified as the best parameter values under the “smaller is better” condition. The response table analysis and S/N ratio analysis both supported the finding that feed rate, diameter of the drill bit, and spindle speed were the key factor influencing drilling performance, in that order.