Evaluating the electrical discharge machining (EDM) parameters with using carbon nanotubes

Electrical discharge machining (EDM) is one of the most accurate non traditional manufacturing processes available for creating tiny apertures, complex or simple shapes and geometries within parts and assemblies. Performance of the EDM process is usually evaluated in terms of surface roughness, exis...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2012-01, Vol.40 (1), p.12019-6
Main Authors: Sari, M M, Noordin, M Y, Brusa, E
Format: Article
Language:English
Subjects:
Carbon
Carbon nanotubes
Chromium molybdenum vanadium steels
Die steels
Dielectrics
EDM electrodes
Electric discharge machining
Hot work tool steels
Independent variables
Machine shops
Machining
Material removal rate (machining)
Multi wall carbon nanotubes
Process parameters
Surface roughness
Thermal properties
Thermodynamic properties
Tool steels
Wear rate
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Summary:Electrical discharge machining (EDM) is one of the most accurate non traditional manufacturing processes available for creating tiny apertures, complex or simple shapes and geometries within parts and assemblies. Performance of the EDM process is usually evaluated in terms of surface roughness, existence of cracks, voids and recast layer on the surface of product, after machining. Unfortunately, the high heat generated on the electrically discharged material during the EDM process decreases the quality of products. Carbon nanotubes display unexpected strength and unique electrical and thermal properties. Multi-wall carbon nanotubes are therefore on purpose added to the dielectric used in the EDM process to improve its performance when machining the AISI H13 tool steel, by means of copper electrodes. Some EDM parameters such as material removal rate, electrode wear rate, surface roughness and recast layer are here first evaluated, then compared to the outcome of EDM performed without using nanotubes mixed to the dielectric. Independent variables investigated are pulse on time, peak current and interval time. Experimental evidences show that EDM process operated by mixing multi-wall carbon nanotubes within the dielectric looks more efficient, particularly if machining parameters are set at low pulse of energy.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/40/1/012019