Analysis of Form Tolerances in Electrical Discharge Machining Process for Inconel 718 and 625

Dhanabalan, Sathish Chander; Sivakumar, K.; Narayanan, C. Sathiya

doi:10.1080/10426914.2013.852213

Cited by 77 publications

(28 citation statements)

References 17 publications

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“…However, as mentioned in the Introduction, the literature [16][17][18][19][20][21] reveals that the following parameters are the most widely used among researchers: current intensity supplied by the generator of the EDM machine (I), pulse time (t i ), duty cycle (η) and polarity. Accordingly, these four factors have been considered in this particular research work.…”

Section: Methodsmentioning

confidence: 99%

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Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600

Salcedo

Puertas

Pérez

2017

Metals

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Abstract:In this present research work, a new modelling of energy density in EDM (Electrical Discharge Machining) is proposed. Energy density can be defined as the amount of energy needed to get a unit volume of material removed, and for its modelling, the whole EDM process has been taken into account. This new definition lets us quantify the energy density that is being absorbed by the workpiece and the electrode. Results are compared to those obtained by die sinking EDM in an Inconel ® 600 alloy using Cu-C electrodes. Currently, this material is of great interest for industrial applications in the nuclear, aeronautical and chemical sectors, due to their combinations of good mechanical properties, corrosion resistance and extreme hardness at very high temperatures. The experimental results confirm that the use of negative polarity leads to a higher material removal rate, higher electrode wear and higher surface roughness. Moreover, the optimal condition to obtain a maximum MRR (Material Removal Rate) of 30.49 mm 3 /min was: 8 A, 100 µs and 0.6, respectively, for the current intensity, pulse time and duty cycle.

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Section: Methodsmentioning

confidence: 99%

“…Dhanabalan et al [20] made an attempt to analyze the form tolerances in EDM of Inconel 718 and Inconel 625. To do so, current intensity, pulse time, pause time and fluid pressure were chosen as input parameters.…”

Section: Introductionmentioning

confidence: 99%

Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600

Salcedo

Puertas

Pérez

2017

Metals

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“…However, many research works on INCONEL 718 can be found. Dhanabalan et al [17] analyzed the influence of the peak current, pulse-on time, and pulse-off time on the form tolerances in EDM of INCONEL 718 and 625. Kuppan et al [18] studied some machining EDM characteristics in deep-hole drilling of INCONEL 718.…”

Section: State-of-the-artmentioning

confidence: 99%

EDM machinability and surface roughness analysis of INCONEL 600 using graphite electrodes

Torres

Puertas

Luis

2015

Int J Adv Manuf Technol

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Nowadays, graphite is one of the most popular electrode materials in electrical discharge machining (EDM) processes due to the high rate of removal material which reduces machining times. This reduction has a direct impact on the cost of manufacturing the parts. In this research, the influence of EDM parameters and graphite electrode in an INCONEL 600 alloy has been studied for both positive and negative polarity. To do so, the machining performances of the process are evaluated in terms of material removal rate (MRR), electrode wear (EW), and surface roughness (SR). Results confirm that the use of negative polarity leads to higher material removal rate whereas positive polarity is recommended when low values of EW and a good surface roughness are needed. Moreover, values of 22.2854 and 15.3602 mm 3 /min are achieved for negative and positive polarity, respectively. Furthermore, an attempt has been made to study the results obtained in economic terms for industrial purposes. To that end, both production costs and production time of the graphite electrode are compared with those obtained for copper electrodes. It will be shown that graphite electrodes and negative polarity are the most economical within the options considered.

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“…The reason is that in the pulsed arc process, surface melted by the instantaneous high temperature of arc discharge, re-solidified bonding to the surface by the working fluid rapid cooling. But melting solidified layer is usually rough, low toughness, connected with the base is not solid, prone to cracks, this character of engineering applications is often undesirable [11]. Generally, there are exist heat-affected layer, HAZ of metallic material is not melted, but the material is subjected to high temperature, the microstructure of the material changes, but for GH4169 superalloy specimens was not found HAZ, the reason is the lower thermal conductivity, making the temperature generated by pulsed arc discharge distribution on the surface only.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study of Plused arc Machining for Superalloy GH4169

Zhao¹,

Zhu²

2017

Proceedings of the 2017 7th International Conference on Education, Management, Computer and Society (EMCS 2017)

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Abstract. Pulsed arc machining can be used to process the difficult-to-machining materials such as nickel base superalloy with high efficiency, but the surface processing quality is not unsatisfactory. To improve the processing quality, surface micro topography, recast layer were observed in the pulsed arc machining of GH4169 superalloy, surface roughness and microhardness has been tested herein. The results shows that processing parameters in duty cycle at 15~55%, pulse frequency at 400 ~ 700HZ achieved surface roughness lower than 25μm. The recast layer that generated in process result in work harden within 0~50μm from the surface. Cracks were easily formed by high frequency and duty cycle, the increased thickness of recast layer formed by low frequency. The machining quality can be improved by reasonable parameters selected.

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Analysis of Form Tolerances in Electrical Discharge Machining Process for Inconel 718 and 625

Cited by 77 publications

References 17 publications

Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600

Analytical Modelling of Energy Density and Optimization of the EDM Machining Parameters of Inconel 600

EDM machinability and surface roughness analysis of INCONEL 600 using graphite electrodes

Experimental Study of Plused arc Machining for Superalloy GH4169

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