PURPOSE: A piston-ring manufacturing method for a die casting device is provided to decrease a manufacturing cost due to remove a waste of a material by manufacturing the piston-ring in a centrifugal casting mode.;CONSTITUTION: A piston ring manufacturing method for a die casting device comprises the following steps: a step(S2) aims to centrifugal cast a molten metal with being adhered closely to an inner periphery of a cavity by rotating a centrifugal casting mold at a fixed revolutions per minute(RPM) with injecting the molten metal into an inside of the cavity of the centrifugal casting mold; a step(S3) aims to anneal a semi finished product of the piston ring which is center casted in the cavity of the centrifugal casting mold; and a step(S4) aims to manufacture a complete product of the piston ring by processing the semi finished product of the piston ring to a fixed form and a fixed dimension.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Start; (BB) LOT No. marking; (CC) Cutting incision unit by 45°; (DD) Completion; (S1) Manufacturing master alloy; (S2) Injecting master alloy into a centrifugal casting mold and manufacturing centrifugal casting; (S3) Annealing; (S4) Cutting internal and external diameter/; (S5) Home cutting; (S6) Low pressure plasma ion nitrification heating process
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