Comparison on foil EDM characteristics of single crystal SiC between in deionized water and in EDM oil

Zhao, Yonghua; Kunieda, Masanori; Abe, Kohzoh

doi:10.1007/s00170-016-8412-z

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…20 show that the craters generated in ultrapure water are slightly smaller than those in EDM oil, and the surface roughness Ra is slightly higher than those in EDM oil. This is also consistent with previous research [43]. The reason is that the expansion of the plasma channel in ultrapure water is more limited, so the plasma channel has a higher energy density than that in EDM oil.…”

Section: Effects Of Dielectric Fluidsupporting

confidence: 93%

Theoretical and experimental investigation into machining characteristics Of VHF micro-EDM

Zhang

et al. 2021

Int J Adv Manuf Technol

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To further explore the machining characteristics of very high-frequency micro-electrical discharge machining (VHF micro-EDM), the range of radio-frequency (RF) power amplifier was expanded to 110 MHz, and the power of the RF power amplifier was also greatly increased up to 91 W. The principle of the VHF pulse generator was discussed in detail, and an electrothermal model suitable for VHF micro-EDM was established to determine the diameter of the plasma channel and the energy distribution ratio. Experimental studies for VHF micro-EDM were also carried out, and the effects of power and frequency on machining characteristics were then analysed and discussed. The results show that at the same frequency, the higher the power is, the higher the material removal rate (MRR) and the larger the number of discharge craters. At the same power, the MRR and the size of discharge craters both first increase and then decrease with increasing frequency and reach the maximum value at 65 MHz. For the copper workpiece, when the frequency is 110 MHz and the total power of the power amplifier is 8.0 W, 5.6% of the energy is used for the material removal of the workpiece, and the finest processing surface is obtained with the surface roughness Ra=12 nm. The average diameter of the discharge craters is as small as 0.268 μm, and the diameter of the plasma channel is only 0.350 μm. In addition, the effects of different workpiece materials and dielectric fluids are also analysed in this paper.

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Section: Effects Of Dielectric Fluidsupporting

confidence: 93%

Theoretical and experimental investigation into machining characteristics Of VHF micro-EDM

Zhang

et al. 2021

Int J Adv Manuf Technol

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“…Elemental Al is considered to be from the aluminum powder added to the working fluid adhering to the surface of the workpiece. Except for the appearance of Al, the same analysis result was obtained in the analysis of the EDM'd surface in EDM oil [27].…”

Section: Difference In Surface Integritysupporting

confidence: 59%

Comparison of Micro-EDM Characteristics of Inconel 706 between EDM Oil and an Al Powder-Mixed Dielectric

Wang

Zhang

2019

Advances in Materials Science and Engineering

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Inconel 706 is a newly developed aeronautical material that has corrosion resistance along with high mechanical strength. Conventional machining of Inconel 706 results in a poor surface finish and a low-dimensional accuracy. Hence, micro-EDM (electrical discharge machining) is utilized to machine Inconel 706. This work proposes a comparison of micro-EDM characteristics of Inconel 706 between EDM oil and an Al powder mixture. The effects of input parameters on the surface roughness, material removal rate, tool removal rate, and microstructures of the machined surfaces between EDM oil and EDM oil mixed with Al were investigated. It was clarified that micro-EDM with a certain amount of Al powder added to the EDM oil can attain a high MRR and better surface integrity. However, the TWR discharge gap was larger than that in the EDM oil. Furthermore, it was observed that more attachment of the workpiece was adhered to the top surface of the electrode in the EDM oil due to its unstable machining. It was explained that the MRR increases with an increase in the Al concentration and then tends to decline.

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“…Meanwhile, the studies of discharge characteristics in mixed two-phase medium are limited to the gas-liquid. 15,16 There are two important theories about the mechanism of the onset and development of discharge in gas medium, that are Towensed theory and Streamer theory, respectively. 17–19 The main points for the mechanism of the breakdown discharge theories in liquid medium including: the electron discharge in gas medium, the bubble discharge, and the breakdown discharge of impurities.…”

Section: Introductionmentioning

confidence: 99%

Research on discharge characteristics of working mediums of electric discharge machining

Liu

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Successful surface modification can be obtained by Electrical Discharge Machining (EDM). In this work the discharge characteristics in misted deionized water and near-dry powder-mixed medium was studied systematically, as well as the microstructure and properties of electrical discharge strengthened layers on TC4 alloy. It indicates that the breakdown voltage of EDM in misted deionized water medium has been reduced to about 1/3 than in air medium. In near-dry powder-mixed medium, it is reduced to about 1/9, because the discharge gap is much larger than that of other mediums. In other words, a stable discharge can be obtained by larger discharge gaps and lower pulse energy than traditional EDM surface strengthening method, which leads to more stable discharge process. Experimental researches show that dense and sound combination with matrix like, multiphase hybrid intensification and chrysanthemum petal-like microstructure of strengthened layers can be observed in the near-dry powder-mixed medium. Meanwhile, it is found that the microhardness of the strengthened layer is up to about 1200 HV, which is four times higher than the base material.

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Comparison on foil EDM characteristics of single crystal SiC between in deionized water and in EDM oil

Cited by 19 publications

References 10 publications

Theoretical and experimental investigation into machining characteristics Of VHF micro-EDM

Theoretical and experimental investigation into machining characteristics Of VHF micro-EDM

Comparison of Micro-EDM Characteristics of Inconel 706 between EDM Oil and an Al Powder-Mixed Dielectric

Research on discharge characteristics of working mediums of electric discharge machining

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