Analysis Of EDM Parameters During The Micro Hole Machining Of Tungsten Carbide

Yaw, Chong Hong (2010) Analysis Of EDM Parameters During The Micro Hole Machining Of Tungsten Carbide. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Electrical discharge machining (EDM) is a widespread process which works very effectively in machining of micro holes and harder material with high dimension accuracy. In this study, the objective is to optimize the machining parameter of the EDM process including peck current, pulse duration, and with or without flushing process to increase the material removal rate and reduce the electrode wear rate. EDM machine model MITSUBISHI has been used in this project and the weight for the workpiece and electrode has been measured using the digital weight machine. The material removal rate and electrode wear rate were calculated using the formula. Copper has been used as electrode to machine the tungsten carbide, which is widely used to make micro die for plastic extrusion. Response surface methodology (RSM) method has been applied in this project at two levels (high, +1 and low, -1) and there are 26 experiments have been done. From the result, the lowest material removal rate is 4.55952E-006g/second while the maximum material removal rate is 5.49336E-005g/second. The lowest electrode wear rate is 1.91171E-006g/second while maximum electrode wear is 6.30569-005g/second. The optimum machining parameter to increase material remove rate and reduce the electrode wear rate are 14.67 A of peak current, 2.57 μs pulse on time and ON the flushing process.

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