Optimal Seeking Surface Roughness and Material Removal Rate Responses of Hardened AISI 4340 High Strength Low AlloySteel in Dry Sustainable Environment

The aim of this research is to study the machinability aspects hardened AISI 4340 High Strength Low Alloy (HSLA) steel (50 ± 2 HRC (Hardness Rockwell C)). experimental investigation using coated carbide inserts carried out during dry hard milling process in a sustainable environment. input parameters are speed, feed rate and depth cut responses Average surface Roughness (Ra) Material Removal Rate (MRR) that selected through screening. Central Composite Design (CCD) response methodology has been utilized as design technique with twenty experiments. Analysis variance employed examine momentous machining responses. A mathematical model developed optimize roughness material removal rate. It observed most significant factor for Ra while MRR factor. results show minimum value ~ 0.098 μm achieved at speed 1000 RPM, 300 mm/min 0.2 mm maximum 6.35 cm3/min attained 500mm/min 0.4 regarding less or no effect 500-1000 RPM. average forecast error validation information be 3.35%. 3.2% MRR. Further, it investigated good finish like grinding dimensional accuracy can tools.