EXPERIMENTAL AND STATISTICAL INVESTIGATION OF DRILLING OF AISI 1040 STEEL AT DRY AND WET CONDITIONS

Abstract

AISI 1040 steel is widely used in the machinery and manufacturing industries and is usedin a variety of machine parts, automotive parts, molds, fixtures and many other areas. Technologicaldevelopments in the field of machining in recent years have led to many problems affecting machiningperformance. Drilling is one of the most important machining operations. In this study effect of drillingparameters such as cutting speed (15, 20 m/min), feed rate (0.1, 0.15 mm/tooth), type of drill (HSS-E, HSSETiN coated), drilling type (standard, pecking) and cooling type (liquid, air) were examined on AISI 1040steel. Parameters’ effects on surface roughness were investigated. Experiments were planned according toL8 orthogonal array. Optimum conditions were found via Taguchi’s Signal/Noise analysis. Probabilityanalysis was performed to discover the distribution of the measured/calculated values of the results.Lastly, confirmation tests were conducted to control the success of the optimization. The optimalconditions for surface roughness were observed at A1B2C2D1E2 (i.e., cutting speed: 15m/min, feed rate:0.15mm/tooth, cooling type: liquid, drilling type: standard, and type of drill: HSS-ETiN coated).