Abstract
Problem statement: Electrical Discharge Machining (EDM) is now a well-established machining option in many industries. Tungsten carbide (WC-Co) is an important tool and die material mainly because of its high hardness, strength, wear resistance and high melting point. Normally, EDM is capable of machining geometrically complex or hard material component, that are precise and difficult to machine. The objective of this research is to study the performance of different electrode materials on tungsten carbide workpiece with EDM process. Approach: The electrode materials were graphite (Poco EDM-3), copper-graphite (Poco EDM-C3) and copper-tungsten (solid).The important parameters were discharge current, on time, off time, open-circuit voltage and electrode polarity. A workpiece material was a tungsten carbide (W 90-Co10). Results: The results show that the electrode negative polarity performs very well, Poco EDM-3 gives higher Material Removal Rate (MRR). Both powder electrode (EDM-3 and EDM-C3) give the better MRR and EWR more than solid electrode. Conclusion: The suitable duty factor is 11%. The Surface Roughness (SR) of copper-tungsten give the best when current peak intensity not over 20 amperes.
Highlights
Electrical Discharge Machining (EDM) is a machine that is used as non-traditional manufacturing and this machine is continually developing further technology that would be impossible to produce with faster and conventional (Mahdavinejad and Mahdavinejad, 2005)
EDM process will open up an opportunity for the machining of tungsten carbide
Tungsten carbide is some kind of cemented carbide; the particle of carbide is bind with the process of powder metallurgy (George et al, 2004), such as Tungsten carbide (WC-Co), Titanium Carbide (TaC)
Summary
Electrical Discharge Machining (EDM) is a machine that is used as non-traditional manufacturing and this machine is continually developing further technology that would be impossible to produce with faster and conventional (Mahdavinejad and Mahdavinejad, 2005). This machine produces tools with complex-shapes and being used extensively in industries. Tungsten carbide (WC-Co) is an important tool and die material mainly because of its high hardness, strength and wear resistance. It cannot be processed by conventional machining technique (Singh et al, 2004). EDM process will open up an opportunity for the machining of tungsten carbide. Tungsten carbide is some kind of cemented carbide; the particle of carbide is bind with the process of powder metallurgy (George et al, 2004), such as Tungsten carbide (WC-Co), Titanium Carbide (TaC)
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