Analysis of EDM Drilling of Small Diameter Holes

Płodzień, Marcin; Tymczyszyn, Jarosław; Habrat, Witold; Kręcichwost, Piotr

doi:10.1007/978-3-030-49910-5_17

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…The pulse off-time toff does not significantly affect the value of the Ra surface roughness parameter. In order to determine the goodness of fit of the model to the experimental data, the coefficient of determination R 2 and the adjusted coefficient of determination were calculated according to Equations ( 1) and (2). The coefficient of determination was equal to R 2 = 0.96, whereas the adjusted coefficient of determination was equal to = 0.95.…”

Section: Surface Roughnessmentioning

confidence: 99%

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The Accuracy of Finishing WEDM of Inconel 718 Turbine Disc Fir Tree Slots

et al. 2021

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Servicing aircraft engines sometimes requires manufacturing only a single piece of a given part. Manufacturing a turbine disc using traditional methods is uneconomical. It is necessary to use a different machining method recommended for small lot production. One of the proposed methods is WEDM (wire electrical discharge machining). The article presents the results of the research on finishing WEDM of Inconel 718 turbine disc fir tree slots. The influence of infeed, mean gap voltage, peak current, pulse off-time, and discharge energy on the shape accuracy, surface roughness, microcracks, and the white layer thickness were determined. Mathematical models were developed based on the DoE (Design of Experiment) analysis. The statistical significance of the models was verified with the ANOVA (Analysis of Variance) test. The machining parameters control methods that allow achieving the required shape accuracy, surface roughness, and surface layer condition were presented. The obtained surface roughness was Ra = 0.84 μm, the shape accuracy of the slot in the normal-to-feed direction was Δd = 0.009 μm, the profile shape accuracy was Δr = 0.033 μm, and the thickness of recast (white) layer was approximately 5 μm.

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Section: Surface Roughnessmentioning

confidence: 99%

“…The method consists of removing the material due to electrical discharges between the tool and the workpiece. As a result, EDM can be utilized in machining conductive materials regardless of their hardness [ 1 , 2 ]. EDM is widely used in manufacturing injection molds and in the automotive industry [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

The Accuracy of Finishing WEDM of Inconel 718 Turbine Disc Fir Tree Slots

et al. 2021

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“…The machining zone is submerged in a dielectric liquid, which the most often is distilled water. The removal of material occurs due to melting and evaporation as a result of electric discharges [1,2]. A characteristic feature of this type of machining is the removal of a signifi cant volume of a workpiece in the form of a core as a result of the erosion of a small amount of material [3].…”

Section: Introductionmentioning

confidence: 99%

Surface Topography of Inconel 718 Alloy in Finishing WEDM

Buk¹

2022

Adv. Sci. Technol. Res. J.

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The properties of Iconel 718 determine its application for parts operating in extremely tough conditions. The diffi culties when machining nickel-based superalloys allowed in recent years for researching other machining methods. One of the proposed methods is Wire Electrical Discharge Machining (WEDM). It becomes possible to minimize or eliminate such problems associated with electrical discharge machining as microcracks, forming of a white layer, or high surface roughness. One way to avoid these issues is to apply fi nishing machining. The literature indicates that the peak current is the main parameter responsible for shaping the machined surface in fi nishing WEDM. Furthermore, few works focus on the electrode's infeed, in particular there are not many papers regarding the infl uence of the infeed on the machined surface parameters. Therefore, the paper aims to investigate on the infl uence of the peak current and infeed during fi nishing WEDM on the surface properties of Inconel 718. The paper presents measurements of selected surface topography parameters and Abbot Firestone curves (AFC). The presented plots allowed to determine the ranges of the process parameters for which the lowest surface roughness values were achieved. Cross-sections were performed to measure the thickness of a white layer. Nanohardness HV 0,01 measured by Berkovich tip was recorded to determine the size of a heat aff ected zone (HAZ). The correlation between the peak current I c and the infeed z regarding the machined surface quality was presented.

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Analysis of EDM Drilling of Small Diameter Holes

Cited by 2 publications

References 14 publications

The Accuracy of Finishing WEDM of Inconel 718 Turbine Disc Fir Tree Slots

The Accuracy of Finishing WEDM of Inconel 718 Turbine Disc Fir Tree Slots

Surface Topography of Inconel 718 Alloy in Finishing WEDM

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