Powder additives influence on dielectric strength of EDM fluid and material removal

Jeavudeen, S.; Jailani, H. Siddhi; Murugan, M.

doi:10.1504/ijmmm.2020.104010

Cited by 10 publications

(9 citation statements)

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“…In terms of dielectric fluids, hydrocarbon, vegetable, and synthetic oil-based fluids are maximum and frequently used [13,17]. Dielectric fluids such as kerosine, EDM oil, and deionized water are the most common.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiC Particle Incorporated Dielectric Medium on Electrical Discharge Machining Behavior of AA6061/B4Cp/SiCp AMCs

Khajuria¹,

Nagabhooshanam

Sharma

et al. 2022

Advances in Materials Science and Engineering

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In this work, it was observed that using motor oil as the dielectric fluid when producing AA6061/SiCp/B4Cp hybrid composites provided wealth from waste. In these studies, modifications in silicon carbide (SiC) concentration, electrode (copper and brass), current, pulse time, and reinforcing weight percentage were tested. Surface roughness and machined hardness are measured and reported for each removed piece of the material. The bridging effect of silicon carbide particles raised the material removal rate (MRR), while a thorough dielectric fluid flush enhanced the Ra value. On the machined topography, the oil carbon content left dark smudges. Machining performance is superior to that of copper electrode-processed specimens. The MRR, TWR, and Ra all rise as the discharge current and pulse duration increase. Because there is no remelted layer, composites with low machining surface hardness had better finishes. The parameters were optimized using the TOPSIS approach, and it was observed that the efficiency of machining was enhanced by utilizing engine oil by the concentration of 4 gl−1. Moreover, during machining, optimized parameters like pulse on time 36 seconds, current 4 Amps, and also a brass electrode.

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Section: Introductionmentioning

confidence: 99%

Effect of SiC Particle Incorporated Dielectric Medium on Electrical Discharge Machining Behavior of AA6061/B4Cp/SiCp AMCs

Khajuria¹,

Nagabhooshanam

Sharma

et al. 2022

Advances in Materials Science and Engineering

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“…When additive powder like alumina is added to the dielectric fluid, it gets energised and forms a zig-zag fashion bridging the gap between the electrode surfaces causing early spark [20]. This eventually lowers the breakdown voltage of the dielectric fluid used [12]. This lowered breakdown voltage helps in enhancing the machinability of the PMEDM process.…”

Section: Resultsmentioning

confidence: 99%

“…4 (b). This is possibly due to the addition of powder additives, i.e., PMEDM, into the spark gap, which eventually lowers the breakdown strength of the liquid dielectric, resulting in higher MRR per unit tool wear [12]. In the ANOVA analysis, gap current has played a significant effect on TWI of both the workpieces, followed by duty factor and dielectric flushing (Tables 5 and 7).…”

Section: Effect Of Workpiece Properties On Improving the Twimentioning

confidence: 98%

“…Use of nano TiO 2 powder with rotary tool was also observed to be increasing the machining characteristics of hot work steel [11]. Jeavudeen et al experimented that the addition of additive powders resulted in the lowering of breakdown voltage which also coupled with the reduction of gap voltage [12]. It was reported that the phenomenon of the occurrence of earlier spark in PMEDM resulted in the machining of materials at lower gap voltage, thereby enhancing the material removal rate and tool wear index [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Influence of thermo-electrical property of materials on Powder Mixed Electrical Discharge Machining

Jeavudeen¹,

Siddhi²,

Murugan³

2019

FME Transactions

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Powder Mixed Electrical Discharge Machining (PMEDM) is considered as one of the viable methods to machine the materials which are hard and tough but with appreciable thermo-electrical properties. In PMEDM, it has been established that machinability is enhanced by adding additives in the form of fine powders in the spark gap of EDM process. In this investigation, the role of the thermo-electrical properties of workpiece on PMEDM process has been studied. Materials with distinct thermoelectric property, namely Mild Steel and Aluminium are taken as workpiece with Alumina as additive powder for the PMEDM process. Experiments have been conducted with Taguchi L9 Orthogonal Array (OA) with Material Removal Rate (MRR) and Tool Wear Index (TWI) as responses. Gap current, duty cycle and flow rate of powder mixed dielectric liquid have been taken as process parameters at 3 levels with circular copper rod of 12 mm diameter as tool electrode. Determination of the influence of properties of the workpiece on the machinability has been performed using a custom made PMEDM setup. ANOVA and main effect plot of data means for the aforementioned conditions have been analysed. The results are noteworthy with significant influence of the properties of the workpiece on the machinability of PMEDM process.

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“…To perform PMEDM process, the following powder mixing systems were used to mix the powders with the dielectric and it is delivered at the spark gap: i) Powder additives have been directly mixed in the machining tank and a stirrer was used to prevent the settling of powders [28,29], ii) additional secondary tank was employed to mix the additives with the dielectric liquid and a pump was used for the powder-dielectric mixture [30,31] and iii) tank in tank with an ultrasonic vibrator to maintain the concentration and also to prevent the precipitation of powders at the bottom of the tank [32,33].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of machinability of titanium alloy in the Eductor based PMEDM process

2021

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In this study, an attempt has been made in PMEDM process to sustain the homogeneity in the powder-dielectric mixture irrespective of the nature of the powders, their particle size, concentration etc., The traditional way of powder mixing system in Powder Mixing Electric Discharge Machining (PMEDM) has been refurbished with a novel Eductor based system along with a metering devise to ensure uniform mixing of the powers with the dielectric. Additionally sintered crucible filtration test on the sample of powder-dielectric mixture ensured the presence of known quantity of powders in the dielectric. The experiments are conducted on Titanium alloy with Gap current, Duty factor, Delivery pressure, powder types (Alumina, Silica, and copper) and concentration of these powders as variable process parameters. The output responses, namely material removal rate, tool wear index and surface finish obtained during the machining process have been optimized using AHP-TOPSIS method. The confirmation test indicated that the closeness co-efficient value for the TOPSIS analysis improved by 2.37% compared with the predicted value.

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Powder additives influence on dielectric strength of EDM fluid and material removal

Cited by 10 publications

References 0 publications

Effect of SiC Particle Incorporated Dielectric Medium on Electrical Discharge Machining Behavior of AA6061/B4Cp/SiCp AMCs

Effect of SiC Particle Incorporated Dielectric Medium on Electrical Discharge Machining Behavior of AA6061/B4Cp/SiCp AMCs

Influence of thermo-electrical property of materials on Powder Mixed Electrical Discharge Machining

Enhancement of machinability of titanium alloy in the Eductor based PMEDM process

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