An investigation of electrical discharge machining of graphite/epoxy composites

Cope, Ralph D.; Brown, John C.

doi:10.1016/0956-7143(90)90164-r

Cited by 5 publications

(7 citation statements)

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“…Shorter cutting times are directly associated with higher workpiece MRR which was also due to the increase in peak current. Between each of the peak current settings (2 A, 5 A, 11 A), tool MRR increased nearly by an order of magnitude, though the trend in general remained similar between the three settings as shown in Figure 6 and is consistent with others [23,24,25,26]. …”

Section: Discussionsupporting

confidence: 88%

“…Copper electrode material was selected based on the reported machining efficiency and minimum tool wear in drilling titanium [9,10,11] and polymer composites [22,24,25,26,27]. The tool density was 8.91 gm/cm 3 with a melting point of 1083 °C.…”

Section: Experiments Setup and Methodologymentioning

confidence: 99%

“…Since these process variables can be readily adjusted, machining conditions using positive polarity, were selected based on the reported literature for polymer composites [23,24,25,26,27,28]. Hence, these three principle EDM parameters were selected for this study also and the experiments were established upon full factorial design of these parameters.…”

Section: Experiments Setup and Methodologymentioning

confidence: 99%

“…The makeup of this experimental design consisted of three variables, namely, peak current in amperes (A), percent on-time (duty factor = t on /(t on + t off )), and pulse time in microseconds (µs); each with three levels. The machining parameters and drilling conditions were chosen based on literature [8,9,10,11,12,20,21,22,23,24,25], and compromised selection. Past reported studies showed that pulse geometry and magnitude were the most relevant parameters to achieve desirable features using EDM.…”

Section: Experiments Setup and Methodologymentioning

confidence: 99%

“…The ability of EDM to remove material without application of mechanical force has the possibility of eliminating many of the difficulties seen in conventional machining of composite materials such as drilling. Research into the proper settings for EDM of polymer matrix composites (PMCs) has shown that there is a very specific range of settings at which the workpiece can be machined [4,22,23,24,25,26,27]. Ordinarily, for these materials, the matrix material is non-conductive; however, if the fiber material is conductive, the fibers can be used to generate sparks required for material removal by EDM.…”

Section: Introductionmentioning

confidence: 99%

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Drilling of Hybrid Titanium Composite Laminate (HTCL) with Electrical Discharge Machining

Spaulding

2016

Materials

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An experimental investigation was conducted to determine the application of die sinker electrical discharge machining (EDM) as it applies to a hybrid titanium thermoplastic composite laminate material. Holes were drilled using a die sinker EDM. The effects of peak current, pulse time, and percent on-time on machinability of hybrid titanium composite material were evaluated in terms of material removal rate (MRR), tool wear rate, and cut quality. Experimental models relating each process response to the input parameters were developed and optimum operating conditions with a short cutting time, achieving the highest workpiece MRR, with very little tool wear were determined to occur at a peak current value of 8.60 A, a percent on-time of 36.12%, and a pulse time of 258 microseconds. After observing data acquired from experimentation, it was determined that while use of EDM is possible, for desirable quality it is not fast enough for industrial application.

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Section: Discussionsupporting

confidence: 88%