Towards a better understanding of the surface features of electro-discharge machined tool steels

Lee, L.C.; Lim, L. C.; Wong, Yoke San; Lu, H. H.

doi:10.1016/0924-0136(90)90212-d

Cited by 48 publications

(15 citation statements)

References 3 publications

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“…Surface roughness improves with the higher values of pulse-off-time. It was also found in some studies that first the surface roughness decreasing with the pulse-off-time then starts increasing when there is an increase in the values of pulse-off-time (Bhattacharyya et al, 2007, Marafona and Wykes, 2000, Lee et al, 1990.…”

Section: Effect Of Pulse-off-timementioning

confidence: 78%

Effect of Electrical and Non-electrical Parameters on the Performance Measures of Electro-Discharge Machining: A Review

Vates¹,

Aggarwal²,

Jamwal³

2017

IJTSRD

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The electrical and non-electrical parameters of EDM influence the performance of EDM. EDM is one of the widely used non-traditional machining process used for machine the hard materials which are difficult to machine by the conventional machining processes. In the past few decades EDM gains popularity because of its wide range of applications in the die-making, aerospace industry and other manufacturing sectors. It is also an alternative method of batch production when the conventional machining processes fail to machine a material. The development in the new hybrid techniques and new tool materials makes some new research scopes in the EDM. Lot of research has been done in EDM optimization, monitoring and its application area but still there are many research gaps which need further study. The aim of this paper to identify the effect of electrical and non-electrical parameters on the performance measures of EDM.

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Section: Effect Of Pulse-off-timementioning

confidence: 78%

Effect of Electrical and Non-electrical Parameters on the Performance Measures of Electro-Discharge Machining: A Review

Vates¹,

Aggarwal²,

Jamwal³

2017

IJTSRD

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“…Also, these regions around the crater are subjected to severe residual stresses and hence are more prone to cracking. 57 The crack formation is also associated with sudden cooling of the molten material. During discharge, a molten pool is formed at the surface of the workpiece, and pyrolysis of the dielectric takes place resulting in diffusion of carbon in the material.…”

Section: Resultsmentioning

confidence: 99%

Analysis on the effect of discharge energy on machining characteristics of wire electrical discharge turning process

Giridharan

Samuel

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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Energy conservation is one of the most important aspects of electrical discharge machining process in which the material removal is by means of spark erosion. Metal removal in wire electrical discharge turning is a complex erosion mechanism which involves melting, vaporization and rapid cooling of molten material. In this work, the significance of discharge energy on the performance of wire electrical discharge turning process, namely, material removal rate, surface finish, thickness of recast layer and surface crack, is analyzed. New model to estimate material removal rate and surface finish in wire electrical discharge turning process have been proposed. Erosion energy and kinetic energy imparted by electrons and average physio-thermal properties of work material are utilized for the modeling. Proposed models are validated by conducting experiments on AISI 4340 steel material. The results obtained from the model are well in agreement with the experimental values. The influence of discharge energy on surface crack and recast layer thickness is analyzed using scanning electron microscope micrographs and energy-dispersive x-ray spectroscopy analysis. Surface crack is observed at higher discharge energy. The thickness of recast layer increases with the increase in discharge energy. Three-dimensional surface topography reveals the turbulent nature of machining process resulted from transient erosion phenomena of wire electrical discharge turning process. Higher material removal rates of the order of about 0.06 g/min with consistent average roughness in the range of 4.5–5.5 µm at the expense of 1.6–2.6 J of discharge energy are achieved in this work. The proposed models can be utilized for machining of difficult to machine material by effective utilization of energy that leads to energy conservation in wire electrical discharge turning process.

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“…As mentioned in section 1.1, white layer is hard and contain micro-cracks, caused by high tensile residual stresses exceeding the ultimate strength of the material [26,28]. This surface imperfection further reduces the fatigue, wear and corrosion resistance of Electrical Discharge Machined components [44,45,46,47,48]. Instead of post-machining processes to remove damaged surface layer and to restore the surface properties, powder mixed electrical discharge machining (PMEDM) [49] is suggested.…”

Section: Powder Mixed Edmmentioning

confidence: 99%

A Brief Review of Die Sinking Electrical Discharging Machining Process towards Automation

Pawade¹,

Banwait²

2013

AJME

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Electrical Discharge Machine (EDM) is especially used for the manufacturing of 3-D complex geometry and hard material parts that are extremely difficult-to-machine by conventional machining processes. In this paper authors have reviewed the research work carried out in the development of die-sinking EDM within the past decades for the improvement of machining characteristics such as Material Removal Rate (MRR), Surface Roughness (SR) and Tool Wear Ratio (TWR). In this review various techniques reported by EDM researchers for improving the machining characteristics have been categorized as process parameters optimization, multi spark technique, powder mixed EDM, servo control system and pulse discriminating. At the end, flexible machine controller is suggested for Die Sinking EDM to enhance the machining characteristics and to achieve high-level automation. Thus, die sinking EDM can be integrated with Computer Integrated Manufacturing (CIM) environment as a need of agile manufacturing systems.

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Towards a better understanding of the surface features of electro-discharge machined tool steels

Cited by 48 publications

References 3 publications

Effect of Electrical and Non-electrical Parameters on the Performance Measures of Electro-Discharge Machining: A Review

Effect of Electrical and Non-electrical Parameters on the Performance Measures of Electro-Discharge Machining: A Review

Analysis on the effect of discharge energy on machining characteristics of wire electrical discharge turning process

A Brief Review of Die Sinking Electrical Discharging Machining Process towards Automation

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