An experimental study on micro-EDM in low-resistivity deionized water using short voltage pulses

Nguyen, Minh Dang; Rahman, M.; Wong, Yoke San

doi:10.1007/s00170-011-3397-0

Cited by 59 publications

(21 citation statements)

References 25 publications

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“…Soni and Chakravarthy [6] studied the machining performance of alloy steels based on its surface quality, MRR, wear ratio, and dimensional accuracy. Nguyen et al [7] performed micro-EDM on tempered carbon steel using tungsten electrode. The results revealed that MRR is higher while using deionized water than in hydrocarbon oil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Electrode Specific Performance in Micro-EDM of Die-Steel

Kadirvel

Hariharan

Gowri

2013

Materials and Manufacturing Processes

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Recent advancement in manufacturing industries has given rise to miniaturized and light weight products with increasing high engineering applications. The miniaturized products demand innovative manufacturing methods. Microelectric discharge machining (micro-EDM) is one of the most powerful technologies capable of fabricating microstructures/parts. Experiments have been conducted on the machining of EN24 die steel with different electrodes such as tungsten, copper, copper tungsten, and silver tungsten in micro-EDM setup. The process performance was estimated based on material removal rate (MRR), circularity, overcut, and heat-affected zones (HAZ) of micromachined holes. Further, the outcome of various machining parameters such as gap voltage, capacitance, threshold, and feed rate of the electrode has also been investigated. The results revealed that the Cu as electrode achieved maximum MRR followed by AgW, CuW, and W, respectively.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Electrode Specific Performance in Micro-EDM of Die-Steel

Kadirvel

Hariharan

Gowri

2013

Materials and Manufacturing Processes

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“…In order to obtain surface integrity of Ti-6Al-4V, graphite, electrolytic copper, aluminium and copper-tungsten material were researched as EDM electrodes [11][12][13][14]. EDM dielectric-water-in-oil, kerosene and deionized water were studied to get high MRR and low EWR [15][16][17][18]. Powder-mixed EDM is one of the methods for improving the capabilities of EDM, which can reduce the gap between the tool and work piece, and make the machining more stable and improve the MRR [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Tang

2013

Int J Adv Manuf Technol

104

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Ti-6Al-4V is widely used in the aerospace, automobile, and biomedical fields, but is a difficult-to-machine material. Electrical discharge machining (EDM) is regarded as one of the most effective approaches to machining Ti-6Al-4V alloy, since it is a non-contact electro-thermal machining method, and it is independent from the mechanical properties of the processed material. This paper aims to combine grey relational analysis and Taguchi methods to solve the problem of EDM parameters optimization. From the viewpoint of health and environment, tap water as working fluid has good working environment, since it does not release harmful gas. The process parameters include discharge current, gap voltage, lifting height, negative polarity and pulse duty factor. The electrode wear ratio (EWR), material removal rate (MRR) and surface roughness (SR) as objective parameters are chosen to evaluate the whole machining effects. Experiments were carried out based on Taguchi L 9 orthogonal array and grey relational analysis, and then verified the results through a confirmation experiment. Compared the machining parameters A 1 B 1 C 3 D 2 with A 1 B 2 C 2 D 2 , MRR increased from 1.28 mm 3 /min to 2.38 mm 3 /min, EWR decreased from 0.14 to 0.10 mm 3 /min and SR decreased from Ra 2.37 μm to Ra 1.93 μm. The process parameters sequenced in order of relative importance are: the ratio of pulse width to pulse interval, discharge current, lifting height and gap voltage. The results showed that using tap water machining Ti-6Al-4V material can obtain high MRR, decrease the machining cost and have no harmful to the operators and the environment.

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“…As proven in section continuous sorting and lifetime, the sorting rate is constrained by the duration to sweep electrolytic bubbles. The high‐voltage and ultrashort (< 1 μs) electric pulse can strongly suppress electrolysis , and the sweep time can be decreased by optimizing the nozzle structure to accelerate the local flow velocity. Besides, referring to the bubble sorter triggered by the laser , an additional channel can be utilized to resupply the buffer liquids at high speed for the actuation chamber and remove the residues in time, which can further increase the throughput.…”

Section: Resultsmentioning

confidence: 99%

Spark‐generated microbubble cell sorter for microfluidic flow cytometry

Zhao

You

2018

Cytometry Pt A

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High-speed and accurate cell sorting is of great significance for cell analysis regarding both bioresearch and clinical application. Different from the jet-in-air sorting of commercial flow cytometers, sorting in fully enclosed and disposal microfluidic chips can avoid aerosols and crosscontamination, thus contributing to the improvement of biosafety and test accuracy. However, current microfluidic sorters usually require complicated structures, or otherwise cannot attain high throughput. In this article, a sorting mechanism for microfluidics is proposed for the first time based on the jet flow induced by the spark-generated cavitation microbubble that can be easily realized by a pair of electrodes. The sorter was integrated into a microfluidic chip based on three-dimensional (3D) hydrodynamic focusing and a binary optical element (BOE) for laser illumination. Besides, several aspects of the sorting mechanism were studied to optimize the device. It achieved a switching time of 250 μs at the sample flow velocity of 5 m/s and performed the continuous operation at 200 Hz. Both the stability of fluorescence signals and the viability of cells were basically maintained. To conclude, this work explores a new on-chip sorting mechanism which possesses the merits of simple structure, easy control, and fast switching. © 2018 International Society for Advancement of Cytometry.

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An experimental study on micro-EDM in low-resistivity deionized water using short voltage pulses

Cited by 59 publications

References 25 publications

Experimental Investigation on the Electrode Specific Performance in Micro-EDM of Die-Steel

Experimental Investigation on the Electrode Specific Performance in Micro-EDM of Die-Steel

Experimental study on green electrical discharge machining in tap water of Ti–6Al–4V and parameters optimization

Spark‐generated microbubble cell sorter for microfluidic flow cytometry

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