Experimental investigation of magnetohydrodynamic effect in electrochemical discharge machining

Xu, Yi; Chen, Jihong; Jiang, Baoyang; Liu, Yang; Ni, Jun

doi:10.1016/j.ijmecsci.2018.04.020

Cited by 48 publications

(15 citation statements)

References 30 publications

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“…The effects of different internal flushing pressures on machining performance were studied, as shown in Fig. 15 quickly. This helped remove more material, which increased the MRR and improve the effect of electrolysis around the exit.…”

Section: Influence Of Internal Flushing Pressure On High-speed Edmmentioning

confidence: 99%

“…Therefore, the machining of such filmcooling holes is a key issue in aerospace manufacturing. Combining high-speed electrical discharge drilling with electrochemical machining (ECM) is promising in this context due to such advantages as a high speed and accuracy of machining, and the ability to avoid surface defects and residual stress [14][15][16]. In this combined process, high-speed electrical discharge machining is first used to efficiently and accurately drill the holes, and ECM is then combined with it in situ to remove surface defects [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

Zhang

Wang

et al. 2021

Int J Adv Manuf Technol

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Micro-hole fabrication at a high speed and accuracy of machining while maintaining high surface quality is challenging. A core difficulty is the removal of the products of machining from extremely narrow gaps. To solve this problem, this study proposes an approach that combines high-speed electrical discharge machining (EDM) with electrochemical machining (ECM) by using a helical tube electrode with matched internal and external flushing. During high-speed electrical discharge drilling, matching the internal flushing with the clockwise rotation of the helical electrode can help remove debris from the bottom of the blind hole. During ECM, matching the external flushing with the anticlockwise rotation of the helical electrode can improve the flow of electrolyte in the gap. First, the flow field was simulated to show that matching the internal and external flushing of the helical electrode can enhance the flow of the medium and reduce particle concentration in extremely narrow gaps. Second, a series of experiments were conducted to verify that the taper of the hole and the surface quality of its wall can be improved by using the helical tube electrode. Finally, an experiment was carried out to optimize the machining parameters, and yielded a minimum taper of 0.008 at a speed of rotation of 460 rpm, and pressures of internal and external flushing of 9 MPa and 4 MPa, respectively.

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Section: Influence Of Internal Flushing Pressure On High-speed Edmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

Zhang

Wang

et al. 2021

Int J Adv Manuf Technol

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“…The effects of intense magnetic fields on matter are indeed many and sharpen the curiosity of researchers. Quantum effects [2], thermodynamic [3], mechanical [4,5] imperceptible low field are observed in the material under strong magnetic field.…”

Section: Introductionmentioning

confidence: 96%

High-Gradient Magnetic Separation Method for Weakly Magnetic Particles: an Industrial Application

Farsi¹,

Amroune²,

Moussaoui³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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The high-gradient magnetic separation process is a technique used in heavy industries, particularly steel mills, to extract magnetic particles from mixtures. The difficulty of separating the slightly magnetic particles from the nonmagnetic ones lies in the distribution of the magnetic field and the fineness of their class to be separated. A use of different separation matrix profile is implemented, making it possible to act on the value of the gradient of the inhomogeneous magnetic field. Different matrixes are tested and the results obtained experimentally allows to choose the most efficient matrix form in the operation of extraction which increased by 11% in magnetic fraction yield, 15% iron content and 17% of extraction degree relative to the John's matrix. This matrix used is consistent with that cited in literatures. The separation technology used can extend its useful application to small particles from very weakly magnetic materials. Its exploitation will result in the method of reducing the degree of pollution and improvement the process of extraction of minerals that has an impact on the environment and on human

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“…These include modifying the tool shape, including using flat sidewall-flat front tool [7], side-insulated tool [8], drill bit [9], helical tool with high-speed rotation [10], internally structured tube electrode [11] and spherical tip tool [12]. Other attempts include using pulsed voltage [13,14], modifying the electrolyte constituents [15,16], adding tool motion such as rotation [17] and orbital motion [18], adding tool vibration [19], vibrating electrolyte [20] and doing magnetic assisted field machining [21,22]. It was also shown that deeper holes could be established through adding pressurized electrolyte flow [23] and by applying counter-resistant feeding through reducing the magnitude of contact force between the tool and substrate as drilling progresses [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Machining Limiting Factors on Drilling Progress during Spark Assisted Chemical Engraving (SACE): General Trends

Ziki

Wüthrich

2021

Ceramics

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Spark Assisted Chemical Engraving (SACE) is a micro-machining technology for non-conductive materials, mainly glass, based on thermal assisted etching. Generally, during SACE, drilling proceeds at a fast rate reaching 100 µm/s for the first 100 µm and then it slows down for depths higher than 300 µm. While several techniques have been proposed to establish faster drilling, they mainly rely on tuning the machining parameters to enhance the machining performance. However, with this approach machining parameters need to be constantly tuned to achieve certain machining performance depending on the size of the tool and the features needed. Therefore, this necessitates further work to enhance understanding regarding the SACE machining process fundamentals in order to enhance machining speed and quality. Since SACE is a thermal assisted etching process, both local heating and flushing of electrolyte in the machining zone are required. However, to the authors’ knowledge there is not any study that attempts to analyze the effect of each of these machining limiting factors on the machining performance. This work attempts to clarify the effect of each flushing and heating on the drilling progress for hole depths higher than 100 microns. It therefore provides a deeper understanding of the fundamentals of the SACE machining process.

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Experimental investigation of magnetohydrodynamic effect in electrochemical discharge machining

Cited by 48 publications

References 30 publications

Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

Performance improvement of high-speed EDM and ECM combined process by using a helical tube electrode with matched internal and external flushing

High-Gradient Magnetic Separation Method for Weakly Magnetic Particles: an Industrial Application

Effect of Machining Limiting Factors on Drilling Progress during Spark Assisted Chemical Engraving (SACE): General Trends

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