Experimental investigation of tungsten carbide using wire EDM

Zakaria, Muhammad Yusuf (2017) Experimental investigation of tungsten carbide using wire EDM. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This research presents the machining of tungsten carbide (WC - 99.95%) using wire electro-discharge machining (WEDM) with 0.2 mm diameter brass wire as the tool electrode. The purpose of this study was to investigate the effects of WEDM parameters on the machining characteristics such as surface roughness (Ra), surface hardness (Hv) and microstructure after undergone WEDM process. The Full Factorial Design of Experiment (DOE) approach with two-level was used to formulate the experimental layout and to analyze the effect of pulse on time (ON), pulse off time (OFF) and peak current (C) on the selected machining characteristics. Confirmation tests were also conducted to verify and compare the results from the theoretical prediction using Design Expert software and experimental confirmation tests. This experiment used Sodick VZ 300L for machining tungsten carbide. In general, results exposed that pulse on time (ON) have appeared to be the most significant effect to all responses investigated. Increasing of pulse on time and peak current will increase both surface roughness and surface hardness but increasing of pulse off time will decrease surface hardness and surface roughness. Overall, the results from the confirmation tests showed that the percentage of performance was acceptable due to all the results obtained were within the allowable values which was less than 10% or margin error.

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