Optimization of Cutting Parameters in Drilling AISI P20 Die Mold Steel with Taguchi and GRA Methods

AISI P20 mold steels are widely used to manufacture die molding for plastic parts. In thisarticle, AISI P20 steel was drilled by using uncoated HSS twist drills. In drilling process, Ø8mm drill bit, three cutting speed (v:10, 13 and 17 m/min) and three feed rate (f: 0.1, 0.2 and 0.3mm/rev), and pecking drilling method were used. Taguchi L9 model was performed to designthe drilling tests. Cutting forces and torque were measured by a dynamometer in during theexperiments. The surface roughness and diameter of drilled holes were checked. Taguchi andANOVA analyses were done to determine effects of cutting parameters on the experimentalresults. Grey Relation Analysis (GRA) was used to optimize results of the tests. The resultsshowed that the feed rate was the main effective factor on test results. Moreover, maximumcutting speed (17 m/min) and minimum feed rate (0.1 mm/rev) were optimum cuttingparameters.

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