EFFECT OF INPUT PARAMETERS ON THE DEPTH OF HEAT AFFECTED ZONE (HAZ) AISI H13 STEEL ELECTRİCAL DİSCHARGE MACHİNİNG PROCESS (EDM)

Authors : Mansour Nasiri Khalaji, Reza Matin, Rohollah Rahmani, Mohammad Reza Shabgard

Pages : 33-38

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Publication Date : 2019-12-31

Article Type : Research

Abstract :Abstract The importance of surface integrity of electric discharge machined components has been recognized by the industry and it is still continues to be the major concern among the researchers. This paper presents a study of the relationship between EDM input parameters (duty cycle, pulse-on time and tool polarity) and surface integrity. This study shows that, in both cases of tool polarity (positive and negative), with increasing pulse on-time and duty cycle, the rate of hardness decline in the layers near the machined surfaces is augmented and the depth of the heat affected zone is increased, also in the negative polarity the amount of hardness decline and depth of the heat affected zone is small. Also, according to the results of the EDX analyze, In the positive polarity, the rate of penetration of the carbon diffusion is higher than the negative polarity. 
Keywords : Pulse Duration, Duty Cycle, Polarity, Micro Hardness