Quantitative analysis of bubble size and electrodes gap at different dielectric conditions in powder mixed EDM process

Kumar, Amit; Mandal, Amitava; Dixit, Amit Rai; Mandal, Deepak Kumar

doi:10.1007/s00170-020-05189-x

Cited by 12 publications

(4 citation statements)

References 32 publications

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“…Each of the tool's tip was polished after each experiment as such uniform and uninterrupted sparks are produced during the experimentation [28]. Additionally, it improves process stability [29]. The dielectric fluid used for the experiments was WS 2 powder particles (procured from M/s SRL Chem Lab, particle size: 15 μm) mixed in EDM oil (flash point: 94°C; specific gravity: 0.76).…”

Section: Methodsmentioning

confidence: 99%

“…Here, the duty factor is seen to be significantly affecting the MH of the coated surfaces. At high duty factor (50% to 70%), the discharge energy is more, and therefore pulse on-time is more owing to which more material from the tool and the powders react with the carbon dislodged from the dielectric liquid to form the hard phases [29]. These compounds formed out of different chemical interactions in the dielectric fluid medium get deposited on the work material (due to sudden quenching) in the form of the recast layer that owes to the increasing Vicker's hardness.…”

Section: Vicker's Mhmentioning

confidence: 99%

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Influence of tool materials on surface modification using μEDC process

Mohanty

Das

Dixit

2021

Surface Engineering

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The work aims to assess the influence of tool electrode material while surface modification of Tialloy through the micro-electrical discharge coating (μEDC) process. Brass and tungsten microtool (800 μm)are chosen based on their mechanical, thermal, and electrical properties to conduct the experiments at different coating criteria such as duty cycle, voltage, and powder (tungsten disulphide) concentration. Various performance indexes i.e., micro-hardness, surface roughness, and recast surface height, are evaluated. Energy-dispersive X-ray spectroscopy (EDX) recognizes the elemental presence on the recast zone formed over Ti-alloy. A comparative analysis of the surfaces generated using both thetools is carried out for their performance measurement. The modified samples' hardness improved by twice the base material due to the formation of hard phases of tungsten and titanium, as affirmed by the EDX study. The results indicate that both the micro-tool electrodes' mechanical, electrical, and thermal properties significantly affect the process parameters for surface alteration of Ti-alloy.

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Section: Methodsmentioning

confidence: 99%

Section: Vicker's Mhmentioning

confidence: 99%

Influence of tool materials on surface modification using μEDC process

Mohanty

Das

Dixit

2021

Surface Engineering

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“…Tang et al, 203 Kumar et al, 204 HuuPhan et al, 205 Sundriyal et al 206 Due to re-solidification, Powder Mixed EDM is also employed for Powder Mixed Electric discharge coating.…”

Section: Significance In the Current Eramentioning

confidence: 99%

An insight on Powder Mixed Electric Discharge Machining: A state of the art review

Srivastava¹,

Vishnoi²,

Gangadhar³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Electrical discharge machining (EDM) is an exigent focus of interest for researchers since its inception. EDM has a wide range of applications due to its non-contact machining process based on the spark erosion method. EDM is a non-conventional machining process with high potential in the recent industrial era. Due to the few limitations of EDM, many hybrid techniques are evolved in recent years. The present review paper elucidates the in-depth mechanism of the material removal process in EDM. Hybrid EDM processes are also reviewed with special attention on powder mixed electrical discharge machining (PMEDM). A detailed comparison between the EDM and PMEDM is presented with a meticulous portrayal of the advancement and evolution of PMEDM. The emphasis is given on significant performance parameters, namely tool wear rate, material removal rate and surface roughness, besides other parameters. In addition, the study also includes different modelling, optimization, and surface analysis techniques on EDM. The paper concludes with the future scope of PMEDM in the fields of manufacturing along with its applications.

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“…On the other hand, a larger graphite content lowers the MRR and raises the kerf breadth [19]. e addition of alumina powder to dielectric fluid increases the distance between the electrodes due to the bridging effect, which reduces the Ra [20]. Because of its improved electrical and thermal conductivity, Cu powder mixed deionized water dielectric improves MRR by uniformly distributing electrical and thermal energy in the machining zone [21].…”

Section: Introductionmentioning

confidence: 99%

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

Prakash¹,

Ranjith²,

Mohan

et al. 2022

Advances in Materials Science and Engineering

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In this work, an attempt was made to machine the AZ91/5B4C/5Gr hybrid composites in a castor oil electric discharge medium with an objective of attaining green environment. The hybrid composites were produced using stir casting technique in a protective environment. Experiments were conducted by varying dielectric fluid (castor oil and hydrocarbon oil), tool materials (copper, graphite, and brass), polarity, current, pulse-on time, and gap distance in Al2O3 mixed dielectric medium. L36 Taguchi approach was adopted for the design of experiments, and machining performance was accessed in terms of material removal rate (MRR), tool wear rate (TWR), and surface roughness (Ra). Because of castor oil’s high thermal conductivity, high kinematic viscosity, and lower dielectric strength, the specimen exhibits 5% higher MRR than EDM oil. When the electrodes were connected to the negative polarity, the Ra was 1.72 μm and 3.66 μm at positive polarity; however, at negative polarity, the TWR was higher than the MRR. The high density and specific heat of castor oil facilitate flushing and uniform heat distribution; as a result, the composite had a Ra of 2.52 μm compared to 2.86 μm when machined with conventional EDM oil. Surface topography showed the specimen machined with hydrocarbon dielectric medium proffers black spots, which were eliminated in castor dielectric medium. Best parametric combination was selected by the Relative Index Method optimization technique.

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Quantitative analysis of bubble size and electrodes gap at different dielectric conditions in powder mixed EDM process

Cited by 12 publications

References 32 publications

Influence of tool materials on surface modification using μEDC process

Influence of tool materials on surface modification using μEDC process

An insight on Powder Mixed Electric Discharge Machining: A state of the art review

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

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