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The International Journal of Advanced Manufacturing Technology

Erschienen in:

04.12.2019 | ORIGINAL ARTICLE

Performance analysis of tool electrode prepared through laser sintering process during electrical discharge machining of titanium

verfasst von: Anshuman Kumar Sahu, Siba Sankar Mahapatra

Erschienen in: The International Journal of Advanced Manufacturing Technology | Ausgabe 3-4/2020

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Abstract

Nowadays, additive manufacturing (AM)-based rapid prototyping (RP) is used as a convenient route for making tool electrodes required in electrical discharge machining (EDM). AM enables direct fabrication of complex shaped EDM electrode in comparatively less time in contrast to subtractive machining processes. In this study, an EDM electrode is prepared directly by selective laser sintering (SLS) process using metal matrix composite of aluminium (Al), silicon (Si) and magnesium (Mg). To study the performance of the prepared RP tool electrode in electrical discharge machining, titanium is used as workpiece material and EDM-30 oil as dielectric medium during machining. The performance of the prepared tool electrode is compared with conventional copper and graphite tool electrodes. Experiments have been conducted changing EDM process parameters viz. open circuit voltage (V), peak current (I_p), duty cycle (τ) and pulse duration (T_on) along with three tool electrodes such as RP, graphite and copper tool electrodes. The performance measures considered during the experimental study are material removal rate (MRR), tool wear rate (TWR), average surface roughness (R_a), white layer thickness (WLT), surface crack density (SCD) and micro-hardness (MH) on white layer. SEM and EDX of the machined surface reveal that tool material is generally eroded and deposited on the machined surface with formation of metal carbides. However, tool erosion is more pronounced in case of RP tool electrode. XRD analysis reveals the formation of titanium carbides on the machined surface resulting in increase in the micro-hardness of white layer. Discharge current and tool type are found to be significant parameters influencing the performance measures considered in the study. The surface produced when machined with RP tool electrode exhibits superior surface characteristics while graphite tool electrode produces better MRR and TWR.

Vorheriger Artikel High-speed milling of CFRP composites: a progressive damage model of cutting force

Nächster Artikel Vibration suppression of complex thin-walled workpiece based on magnetorheological fixture

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Titel: Performance analysis of tool electrode prepared through laser sintering process during electrical discharge machining of titanium
verfasst von: Anshuman Kumar Sahu
Siba Sankar Mahapatra
Publikationsdatum: 04.12.2019
Verlag: Springer London
Erschienen in: The International Journal of Advanced Manufacturing Technology / Ausgabe 3-4/2020
Print ISSN: 0268-3768
Elektronische ISSN: 1433-3015
DOI: https://doi.org/10.1007/s00170-019-04675-1

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