Crater morphology evaluation of contemporary advanced EDM generator technology

Klink, Andreas; Holsten, Maximilian; Hensgen, Lars

doi:10.1016/j.cirp.2017.04.137

Cited by 26 publications

(8 citation statements)

References 8 publications

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“…Some researchers [ 34 , 35 ] provided the Ls or cut-off length (2.5 mm) and the standards name. Some [ 24 ] simply stated compliance with the standard.…”

Section: Methodsmentioning

confidence: 99%

“…Influence of EDM parameters on surface topography was studied by numerous authors. Most publications concern profile roughness [24,29,34,37,38], and only few considered areal parameters [29,35] (mainly the height class, e.g., Sa or Sq), analogical to the most widely used profile roughness characteristics. Most of them considered at least three parameters, and two examined just one [34,39].…”

Section: Conventional Approach With Iso Parametersmentioning

confidence: 99%

“…The size of each individual impact can depend on the charge that builds up before each spark, which, in turn, is seen as a function of the electric parameters of the process [ 23 ]. Klink et al showed that basic profile roughness parameters are not sufficient to describe the complexity of EDM-created topographies and they proposed the use of average groove width RSm and the average profile gradient R Δ q for a more sophisticated surface topography description [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Surface Microgeometry Created by Electric Discharge Machining

et al. 2020

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The objective of this work is to study the geometric properties of surface topographies of hot-work tool steel created by electric discharge machining (EDM) using motif and multiscale analysis. The richness of these analyses is tested through calculating the strengths of the correlations between discharge energies and resulting surface characterization parameters, focusing on the most representative surface features—craters, and how they change with scale. Surfaces were created by EDM using estimated energies from 150 to 9468 µJ and measured by focus variation microscope. The measured topographies consist of overlapping microcraters, of which the geometry was characterized using three different analysis: conventional with ISO parameters, and motif and multiscale curvature tensor analysis. Motif analysis uses watershed segmentation which allows extraction and geometrically characterization of each crater. Curvature tensor analysis focuses on the characterization of principal curvatures and their function and their evolution with scale. Strong correlations (R2 > 0.9) were observed between craters height, diameter, area and curvature using linear and logarithmic regressions. Conventional areal parameter related to heights dispersion were found to correlate stronger using logarithmic regression. Geometric characterization of process-specific topographic formations is considered to be a natural and intuitive way of analyzing the complexity of studied surfaces. The presented approach allows extraction of information directly relating to the shape and size of topographic features of interest. In the tested conditions, the surface finish is mostly affected and potentially controlled by discharge energy at larger scales which is associated with sizes of fabricated craters.

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“…Some researchers [ 34 , 35 ] provided the Ls or cut-off length (2.5 mm) and the standards name. Some [ 24 ] simply stated compliance with the standard.…”

Section: Methodsmentioning

confidence: 99%

Section: Conventional Approach With Iso Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Surface Microgeometry Created by Electric Discharge Machining

et al. 2020

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“…This process occurs repeatedly, enabling a continuous machining of the workpiece. Thus, EDM is considered an enabling technology to effectively process difficult-to-cut materials such as Ti6Al4V and Inconel alloys [9,10]. Micro-EDM has also shown a high potential in producing complex features with high characteristics at the microscale [2,8] regardless of the mechanical properties of the workpiece materials, e.g., hardness or high-strength materials [2].…”

Section: Introductionmentioning

confidence: 99%

Self-Flushing in EDM Drilling of Ti6Al4V Using Rotating Shaped Electrodes

Goiogana

Elkaseer

2019

Materials

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This article reports an experimental investigation of the efficacy of self-flushing in the Electrical Discharge Machining (EDM) process in terms of tool wear rate (TWR), hole taper angle and material removal rate (MRR). In addition to a plain cylindrical shape, electrodes of different cross sections (slotted cylindrical, sharp-cornered triangular, round-cornered triangular, sharp-cornered square, round-cornered square, sharp-cornered hexagonal and round-cornered hexagonal) were designed as a means of inducing debris egress and then fabricated in graphite. EDM drilling trials using the rotating shaped electrodes were carried out on a Ti6Al4V workpiece. The results revealed that, although a low TWR and minimum hole taper angle were achieved using a plain cylindrical electrode, the usage of rotating shaped electrodes provided self-flushing of the dielectric fluid during the EDM process, which led to an improvement in MRR compared to that achieved with a plain cylindrical electrode. Besides, in general, the electrodes with rounded corners are associated with a lower TWR, a lower hole taper angle and a higher MRR when compared to the electrodes with sharp corners. Considering these results, it was concluded that different process attributes, i.e., TWR, hole taper angle and MRR, are all greatly affected by the electrode shape, and thus, the proper selection of the electrode shape is a precondition to attain a specific response from the EDM process.

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“…Although EDM has been used to produce surfaces with enhanced boiling heat transfer performance, however, no study reported the boiling enhancement in terms of EDM machining parameters. Since, it is possible to have different textures with the same surface roughness with EDM by using various combination of the machining parameters [4], this study is an attempted to address the effect of EDM machining parameters on boiling heat transfer enhancement. The work reported in this paper is related to the effect of one of the EDM machining parameters, which is pulse discharge duration on boiling heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Boiling Heat Transfer Enhancement Using Engineered Surfaces

Dhadda¹,

Hamed²,

Koshy³

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

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The widespread use of boiling heat transfer in various applications is due to high heat transfer coefficients associated with the phase change from liquid to vapor. Boiling heat transfer coefficients can be further enhanced by modifying the surface conditions of the heated surface at which boiling occurs. The objective of this research is to fabricate textured surfaces with electrical discharge machining (EDM) and to investigate the enhancement in pool boiling heat transfer, concerning machining parameters. It was found that the boiling performance of the surface correlates with the EDM machining parameters with a significant enhancement in heat transfer.

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Crater morphology evaluation of contemporary advanced EDM generator technology

Cited by 26 publications

References 8 publications

Analysis of Surface Microgeometry Created by Electric Discharge Machining

Analysis of Surface Microgeometry Created by Electric Discharge Machining

Self-Flushing in EDM Drilling of Ti6Al4V Using Rotating Shaped Electrodes

Boiling Heat Transfer Enhancement Using Engineered Surfaces

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