Effect of peak current on material removal rate for electrical discharge machining of non-conductive Al2O3 ceramic
Electrical discharge machining (EDM) is a non-conventional machining process where materials are removed by the thermal energy exerted from series of electrical sparks. This process is applied for machining of non-conductive alumina (Al2O3). The workpiece is covered with the adhesive copper foil...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Trans Tech Publications, Switzerland
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/35539/ http://irep.iium.edu.my/35539/ http://irep.iium.edu.my/35539/1/2.pdf http://irep.iium.edu.my/35539/4/35539_Effect%20of%20peak%20current%20on%20material%20removal%20rate_SCOPUS.pdf |
| Summary: | Electrical discharge machining (EDM) is a non-conventional machining process where
materials are removed by the thermal energy exerted from series of electrical sparks. This process is
applied for machining of non-conductive alumina (Al2O3). The workpiece is covered with the
adhesive copper foil to initiate the initial spark between the workpiece and the tool electrode. A
pyrolytic carbon (PyC) layer is generated on workpiece surface by dissociating kerosene dielectric
after the machining of initial copper assisting electrode (AE) layer. In this study, experiments were
performed by varying the peak current and keeping other parameters constant in order to investigate
the effect of peak current on material removal rate (MRR) in EDM of Al2O3. The results showed
that the lowest and the highest values of peak current were 1.1 A and 1.3 A, respectively. Material
cannot be removed due to insufficient PyC layer generation for any values of peak current less than
1.1 A or more than 1.3 A. From the results, it is also observed that the MRR is increased when
higher peak current values are used. MRR was found to be 0.052 mm3/min at peak current 1.1 A and
it was found to be 0.132 mm3/min at peak current 1.3 A. |
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