Optimization of cutting parameters of turning for hardness of AISI 4140 alloy steel

In the present work AISI 4140 alloy steel has been taken as the work piece material. Its Brinell hardness is 197.AISI 4140 steel is chromium, molybdenum and manganese containing low alloy steel. It has high fatigue strength, superior toughness, good ductility, abrasion and impact resistance and torsional strength that's why it is used to make drive shafts, pump shafts, connecting rods, lathe spindles etc. For machining of work piece the insert chosen is carbide insert. Speed, feed and depth of cut were the three factors taken at low, medium and high levels. 9 runs of experiment were performed using L-9 orthogonal design. The output response is Rockwell hardness of the material. This output response was analysed by SN ratio, analysis of variance and response table. The criteria chosen is Larger is better for hardness and Taguchi method is applied for Optimization. The experimental result shows that depth of cut most significantly influences hardness followed by speed of revolution and feed. (C) 2019 Published by Elsevier Ltd.