OPTIMIZATION OF MACHINING PARAMETERS IN HIGH-SPEED MACHINING OF HARDENED DIE STEEL – AISI H13 USING MULTILAYER – PVD COATED WC TOOLS USING RSM AND GA

Abstract

The chromium-molybdenum steel known as Hardened Die steel AISI H13 is a versatile material that is frequently utilized in both cold- and hot-work tooling applications. H13 hardened steel's high hardness and hot strength prevent thermal fatigue cracking, which develops as a result of cyclic cooling and heating in cold and hot work tooling applications. In this study, we plan to investigate how hard, high-speed machining can be used to optimize the machining of AISI H13 hardened steel. CNC milling operations are preferred over other machining techniques for such as turning, grinding, and drilling, due to their obvious advantages. Design of experiments, Response Surface Methodology (RSM) and Genetic Algorithm (GA) will be planned using Design Expert software. The three parameters: Cutting Speed, Depth of Cut, and Feed Rate, will be controlled in this study's high-speed end milling of AISI H13 steel using coated WC tools. To provide an even better surface quality and reduce tool flank wear, we have tuned the machining parameters for the optimal surface roughness and wear circumstances. According to models of surface roughness and tool flank wear, cutting speed and feed rate each have a significant individual impact on surface roughness, and the combination between feed rate and spindle speed also has a significant impact. Higher cutting speeds have been found to reduce tool flank wear and surface roughness. However, in cases of surface roughness and tool flank wear, depth of cut is significantly less important within the range of chosen cutting parameters.