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The influence of EDM parameters when micro-hole drilling of tungsten carbide.

Shamsudin, Shazarel and Chang , Chia Chze and Mohideen Batcha, Mohd Faizal (2008) The influence of EDM parameters when micro-hole drilling of tungsten carbide. In: Engineering Postgraduate Conference (EPC), Bangi, Selangor.


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Tungsten carbide is one of the essential materials used in carbide dies, cutting tools and components under erosion. Although Electrical Discharge Machining (EDM) is suitable for handling this material, it is not ideal for micro-hole machining due to its hardness property. The purpose of this study is to describe the characteristics of EDM micro-hole tungsten carbide using Sodick 3-axis die sinking machine with 0.5mm diameter copper as an electrode. In the current study, the effectiveness of the EDM process was evaluated in terms of material removal rate (MRR), electrode wear rate (EWR) and diameter overcut. Design of Experiment (DOE) method has been adopted and findings on the influence of the process parameters, namely peak current (Ip), pulse on time (ti) and polarity (ve) over MRR, EWR and diameter overcut is presented in this paper. The process employs different range of peak current (1.5, 3.0(A)), pulse on time (3.2, 6.4 (μs)) and polarity ((+ve), (-ve)). Experimental results indicate that the MRR increased when the peak current with negative polarity is kept at high level whilst the EWR minimised when the negative polarity with low level of peak current setting is employed. In the case of diameter overcut, it has been found that the use of positive polarity associated with low level pulse on time setting will minimise the diameter overcut and produce a constant micro-hole shape.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: tungsten carbide; micro-hole drilling; EDM; DOE.
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Manufacturing and Industrial Engineering
Depositing User: Mrs Hasliza Hamdan
Date Deposited: 07 May 2012 01:06
Last Modified: 07 May 2012 01:06
URI: http://eprints.uthm.edu.my/id/eprint/2310
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