Influence Of EDM Machining On Surface Integrity Of SKD 11 Tool Steel

Chan, Wai Weng (2009) Influence Of EDM Machining On Surface Integrity Of SKD 11 Tool Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This paper presents a study on influence of Electrical Discharge Machining to surface integrity of SKD 11 tool steel. The factors that concerned in this paper were pulse on time and peak current. The surface integrities that have been checked were, white layer thickness and surface hardness. EDM is essentially a thermal process with a complex metal –removal mechanism, involving the formation of plasma channel between the tool and workpiece electrode. The sparks produced during the EDM process locally melt the metal surface, which then undergoes an ultrarapid quenching. After solidification, a layer is formed at the workpiece surface, the socalled white layer. By using DOE full factorial design, 16 trials have been carried out. Each of the 10mmX10mm cross sectional area block of tool steel was EDMed by copper electrode with pulse on time and peak current varies. The EDMed surfaces of blocks were observed for its white layer thickness and surface. The results were analyzed to determine the most significant impact factor and relationship of the parameters selected with the WLT and surface hardness. With respect to white layer thickness, both factors were found to be insignificant, but peak current was the most impact factor compared to pulse on time. Both factors are proportional to the white layer thickness, while peak current and pulse on time increase, the white layer was also increase. On the other hand, with respect to surface hardness, both of the effects were insignificant. The relationship of the factor and surface hardness is direct proportional.

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