Study on Expansion Process of EDM Arc Plasma

Natsu, Wataru; Shimoyamada, Mayumi; Kunieda, Masanori

doi:10.1299/jsmec.49.600

Cited by 50 publications

(30 citation statements)

References 4 publications

(5 reference statements)

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“…The increase in pulse on time means applying the same heating flux for a longer time. This will cause an increase of heat that is conducted into the workpiece as the plasma channel expands which will result in an increase in the MRR [13,14]. As the discharge duration increases, the pressure inside the plasma channel will be lower [15].…”

Section: Edm Parametric Influence On the Mrrmentioning

confidence: 99%

Study of the parameters in electrical discharge machining through response surface methodology approach

Habib

2009

Applied Mathematical Modelling

181

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a b s t r a c tWhereas the efficiency of traditional cutting processes is limited by the mechanical properties of the processed material and the complexity of the workpiece geometry, electrical discharge machining (EDM) being a thermal erosion process, is subject to no such constraints. The lack of correlations between the cutting rate, the surface finish and the physical material parameters of this process made it difficult to use. This paper highlights the development of a comprehensive mathematical model for correlating the interactive and higher order influences of various electrical discharge machining parameters through response surface methodology (RSM), utilizing relevant experimental data as obtained through experimentation. The adequacy of the above the proposed models have been tested through the analysis of variance (ANOVA). Optimal combination of these parameters was obtained for achieving controlled EDM of the workpieces.

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Section: Edm Parametric Influence On the Mrrmentioning

confidence: 99%

Study of the parameters in electrical discharge machining through response surface methodology approach

Habib

2009

Applied Mathematical Modelling

181

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show abstract

“…A similar effect is observed with the pulse duration (on-time). These observations can be found in the works by Jilani (1982), Pandey (1986), Ben Salah (2006), Natsu (2006), Kojima (2007) and Yeo (2007) that are already included in the references of the paper. 11) In Page 11, section 5 the authors mention that "However, these data correspond to a given EDM regime, and therefore will vary for other regimes".…”

Section: The Results Is Two Different Surfaces That Exhibit Similar Vamentioning

confidence: 70%

“…It also showed its dependency on material's physical properties. Das (2003), Descoeudres (2005), Natsu (2006) and Kojima (2007) made optical observations using high speed framing cameras that corroborate the initial fast growth and later stabilization. This experimental observation is commonly expressed mathematically using Equation 2:…”

Section: -Reviewermentioning

confidence: 81%

Computer simulation of performance of electrical discharge machining operations

Sánchez¹,

Izquierdo²,

Ortega³

et al. 2009

International Journal of Computer Integrated Manufacturing

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“…The radius of the load step was increased gradually according to Eq. (6). During the analysis, the heat transfer problem was solved load step by load step until the end of the pulse on time.…”

Section: Solving Methodsmentioning

confidence: 99%

“…Patel et al [5] developed an erosion model with assumptions that a constant fraction of the total power supplied to the gap was transferred to the anode and the generated spark produced a Gaussiandistributed disc heat flux. Natsu et al [6] proposed a firststage-expansion model to study the EDM process. In their model, the diameter of the spark channel was assumed to expand to 0.6 mm within 3 μs after the dielectric was broken down and then remained constant.…”

Section: Introductionmentioning

confidence: 99%

A new thermal model considering TIE of the expanding spark for anode erosion process of EDM in water

Zhang

et al. 2015

Int J Adv Manuf Technol

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For the advantages of environment-friendly decomposition product, fireproofing, and low cost, the water or water-based dielectric is widely used in die-sinking electrical discharge machining (EDM) and wire EDM, especially in the high-efficiency electrical erosion process. In order to study the process of EDM in water, in this paper, a theoretical spark column expansion formula has been derived instead of directly using the previous empirical expressions for EDM in oil dielectric. It is found that the approximate expression of the proposed formula is extremely close to the previously widely used empirical expression for EDM in oil dielectric when the parameters are selected appropriately. The corresponding parameters for EDM in water are determined according to the dimensions of experimentally obtained craters. The proposed theoretical formula reveals that the total heat transfer time decreases radially from the center to the periphery at the spark/anode interface rather than equals to the pulse on time everywhere. This phenomenon can be considered as the time integration effect (TIE) caused by the expanding spark, and it has been calculated quantitatively based on the derived formula. Finally, a finite element thermal model considering the TIE has been developed. The results of craters and material removal rate (MRR) predicted by the proposed model show a close agreement with experimental results, which indicates that the developed thermal model can be used to study the spark expansion rule and understand the EDM process. Keywords Electrical discharge machining (EDM) . Spark expansion formula . Finite element thermal model . Time integration effect (TIE) Nomenclature C Combined coefficient (μm 2 /J) C p Average specific heat (J/kg/K) K Average thermal conductivity (W/m/K) i Peak current (A) u Discharge maintaining voltage (V) t e Pulse on time (μs) t off Pulse off time (μs) t h Total heat transfer time (μs) R s Spark column radius (μm) lDistance of discharge gap (μm) r i Initial spark radius (μm) R c Crater radius (μm) h c Crater depth (μm) V c Volume removed per spark (mm 3 ) F a Fraction of energy going to anode T m Melting Temperature (K) T b Boiling Temperature (K) L m Latent heat of melting (kJ/kg) L v Latent heat of vaporization (kJ/kg) T Temperature (K) q 0 Uniform heat flux (W/m 2 ) ρAverage material density (kg/m 3 )

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Study on Expansion Process of EDM Arc Plasma

Cited by 50 publications

References 4 publications

Study of the parameters in electrical discharge machining through response surface methodology approach

Study of the parameters in electrical discharge machining through response surface methodology approach

Computer simulation of performance of electrical discharge machining operations

A new thermal model considering TIE of the expanding spark for anode erosion process of EDM in water

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