Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining

Sundriyal, Sanjay; Vipin, .; Walia, R. S.

doi:10.5545/sv-jme.2019.6475

Cited by 13 publications

(6 citation statements)

References 23 publications

(27 reference statements)

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“…Further increasing the concentration of powder, the WLT is slightly reduced by reducing breakdown strength and the uniform distribution of spark [53]. While increasing the graphite powder concentration in the argon gas, the lower the amount of heat energy penetrated due to the non-uniform spark concentration [20,23,54]. This leads to the formation of microcracks and pores on the machined surfaces, as shown in figures 9(a)-(c).…”

Section: Machining Mechanism Of Graphite Powder-argon Gas Assisted De...mentioning

confidence: 98%

“…The results of the ANOVA test indicated that nanoparticles had a favourable impact on surface polish, and the investigation′s Ra ranged from 1.88 to 4.44 μm [22]. Powder mixed near-dry EDM outperformed conventional EDM in terms of tool wear, surface roughness, material removal rate, residual stress, and micro hardness [23]. Very recently, various dry and near-dry EDM experimental research studies were performed to improve the surface and machining speed using different gases, and gas-mist dielectric fluids [24][25][26].…”

Section: Introductionmentioning

confidence: 97%

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Experimental investigation on microhardness, surface roughness, and white layer thickness of dry EDM

Janardhana

Anushkannan²,

Dinakaran

et al. 2023

Eng. Res. Express

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In this research, the environment-friendly dry electrical discharge machining (EDM) process is investigated to improve the microhardness, surface finish, and white layer thickness of the machined surfaces using graphite-argon gas as a dielectric medium. The graphite powder, mixed with compressed argon gas, has been used to replace the existing dielectric medium in the EDM process. Gas pressure, discharge current, pulse width, and gap voltage were working as input parameters to reduce surface roughness and enhance the microhardness and white layer thickness. The Taguchi L16 orthogonal array is applied to the design and analysis of the experimental results. The minimum surface roughness (2.23 µm) of the HN31 steel has been attained by increasing the gas pressure up to 1.0 MPa and the minimum values of pulse width (40 µs), gap voltage (40 V), and discharge current (6 A). The maximum microhardness (501.04 HV) has been obtained at 1.2 MPa of gas pressure, 120 µs of pulse width, 60 V of gap voltage, and 18 A of discharge current. The maximum white layer thickness (16.24 µm) is achieved by the maximum values of gas pressure (1.2 MPa), pulse width (160 µs), gap voltage (70 V) and discharge current (18 A). The SEM analysis had been done to reveal the white recast layer thickness and surface roughness of the machined surfaces of the dry EDM process. The SR is increased by the recast layer, pores, and microcracks on the machined surfaces. Finally, the multi-criteria optimization technique: Weight Product Method (WPM) is applied to predict optimum process parameter settings: GP: 1.2 MPa, PW: 120 µs, GV: 50 V, and DC: 18 A to meet the best machining performances (MH=493.32 HV, WLT= 14.28 µm, and SR= 3.82 µm). The validation tests were done to confirm the predicted results obtained by both the Taguchi and WSM methods.

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Section: Machining Mechanism Of Graphite Powder-argon Gas Assisted De...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

Experimental investigation on microhardness, surface roughness, and white layer thickness of dry EDM

Janardhana

Anushkannan²,

Dinakaran

et al. 2023

Eng. Res. Express

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show abstract

“…It was found that the material erosion rate decreased, and the electrode wear increased with an increase in reinforcing quantity in the matrix phase [15]. Some researchers [16][17][18][19] have checked the feasibility of EDM in composite materials, and their results yield that the reinforcing constituents in the matrix obstruct effective sparking and reduce matrix phase erosion.…”

Section: Introductionmentioning

confidence: 99%

Utilizing multiple criteria decision-making optimization methods to machine LM25Al/VC material under electro-discharge machining processes

Tolcha,

Lemu

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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In this work, sparking electro-discharge machining (EDM) process parameters are optimized by using multiple criteria decision-making (MCDM) methods. The work piece utilized for the investigation was LM25 aluminum alloy reinforced with Vanadium carbide (VC), processed through a stir casting technique. The EDM process parameters that have been considered in this work are by peak current, pulse-on-time, and pulse-off-time, with the effects of each variable and their combinations on the performance metrics of EDM like material removal rate, electrode wearing rate, and surface roughness. In this study, three MCDM methodologies were applied to evaluate EDM performance. Then, the obtained MCDM scores were compared using two different objective verification mechanisms. In this case, the VIKOR technique delivered the best-desired results relative to TOPSIS method, and factorial analyzing method. Also, the factorial method is simpler than the other methods, though it produced nearly identical results as the sophisticated MDCM method.

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“…However, the machining performance of the pure air/gas dielectric EDM process is lower than liquid processes. The airmust/ gas-mist near-dry EDM is an alternative method to enhance the performance of dry EDM (Ganachari et al 2019;Sundriyal et al 2020). Many research activities have been performed to increase the machining performance of the dry WEDM.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cryogenically-treated Stainless Steel on Eco-friendly Wire Electrical Discharge Machining Process

Boopathi¹

2022

Preprint

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In this research, the influences of cryogenically treated stainless steel-grade 317 on the eco-friendly near-dry wire-cut electrical discharge machining (NDWEDM) processes have been investigated using minimum quantity of water mixed with oxygen gas dielectrics. The stainless-steel Grade-317 has been applied to make the various biomedical components. The wear ratio (WWR), and cutting rate (CR) are compared using cryogenically treated and un-treated work materials. The water flow rate, gas pressure, spark current, and pulse width had been considered as process parameters. All the tests were performed and compared by Taguchi’s L27 orthogonal array. The surface topography of the machined surfaces and wear of wire had been illustrated for both treated/untreated materials by scanning electron microscope (SEM) images. It was reported that the WWR and CR of cryogenically treated materials are 20.31% lower and 22.32% higher than untreated materials respectively.

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Study on the Influence of Metallic Powder in Near-Dry Electric Discharge Machining

Cited by 13 publications

References 23 publications

Experimental investigation on microhardness, surface roughness, and white layer thickness of dry EDM

Experimental investigation on microhardness, surface roughness, and white layer thickness of dry EDM

Utilizing multiple criteria decision-making optimization methods to machine LM25Al/VC material under electro-discharge machining processes

Effects of Cryogenically-treated Stainless Steel on Eco-friendly Wire Electrical Discharge Machining Process

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