Improving the performance of EDM deep hole using multi-hole interior flushing electrode

Chuvaree, Suppawat; Kanlayasiri, Kannachai

doi:10.1088/1757-899x/361/1/012013

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…They confirmed that the enhanced flushing of debris from the machining gap increases machining performance. Chuvaree et al [34,43] investigated the dimension accuracy of an EDM deep hole using a multihole interior flushing electrode. They reported that the improved flushing technique is able to achieve a better closed gap tolerance and higher material removal rate compared with the conventional flushing method.…”

Section: Introductionmentioning

confidence: 99%

Improving Machining Performance for Deep Hole Drilling in the Electrical Discharge Machining Process Using a Step Cylindrical Electrode

Jamkamon

Janmanee

2021

Applied Sciences

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The performance of electrical discharge machining for drilling holes decreases with machining depth because the conventional flushing and electrode cannot completely eliminate debris particles from the machining area. In this study, a modified electrode for self-flushing in the electrical discharge machining process with a step cylindrical shape was designed to improve machining performance for deep hole drilling. The experimental results of the step cylindrical electrode showed that the material removal rate increased by approximately 215.7%, 203.8%, and 130.4%, and the electrode wear ratio decreased by approximately 47.2%, 63.1%, and 37.3%, when compared with a conventional electrode for the diameters of 6, 9, and 12 mm, respectively. In addition, the gap clearance and concavity of the side wall of the drilled hole was reduced with the step cylindrical electrode. The limited high flank of the electrode led to an increase in the escape area of the debris that was partially removed from the machining area, and the limited secondary spark on the side wall of the electrode resulted in a reduction in machining time.

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Section: Introductionmentioning

confidence: 99%

Improving Machining Performance for Deep Hole Drilling in the Electrical Discharge Machining Process Using a Step Cylindrical Electrode

Jamkamon

Janmanee

2021

Applied Sciences

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“…This can possibly be explained by the high pressure of the dielectric flushing which led to accelerated removal of debris particles from the machining area which results in the higher resistance of dielectric fluid due to the situation cleaning the dielectric in the sparking area. The closed spark gap induced a short circuit and the electrode must be moving in order to retain the approximate discharge gap [12]. Therefore, more machining time was required when the dielectric flushing pressure was at 50 kg/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

Influence of Electrical Parameters on the Machining Performance in the Small Hole Drilling by EDM Process

Jamkamon,

Kumkoon,

Chuvaree

2023

SSP

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This research aims to study the influence of controlled parameters on the machining performance for small hole drilling by an electrical discharge machine. Tubular copper with an outside diameter of 1 mm was used as an electrode. JIS SKD 61 grade steel at a depth of 40 mm for machining was used as a workpiece. The experimental results show that machining speed and electrode wear drastically increased with the discharge current. The high machining performance with varied pulse on-time occurred in the range of 16 to 28 μs. The machining time and electrode wear ratio increased with a decreased pulse off-time. In addition, the lowest difference in the dimension of the entrance and exit of the drilled hole at approximately 0.030 mm appeared at the pulse off-time of 6 μs. However, the high machining speed and electrode wear ratio occurred at the low dielectric pressure of 20 kg/cm2. Furthermore, the machining performance reduced and slightly fluctuated with the varied dielectric pressure in the range of 40 to 80 kg/cm2.

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“…Specifically, the multi-aperture flushing significantly improved the recovery of dielectric strength in the machining gap, which in turn increased the spark intensity. The higher spark intensity subsequently increased the MRR and EWR [5,19,31].…”

Section: Comparison Between the Performance Of Edm With Side Flushing And Multi-aperture Flushingmentioning

confidence: 97%

“…The CCD generated 31 machining conditions, consisting of 16 factorial points, 7 center points, and 8 axial points. The EDM parameters and corresponding parametric values were based on previous studies on EDM using modified copper electrodes [4,30,31]. In this research, the workpiece and electrode were weighed before and after the deep hole machining with 0.001-g precision scale.…”

Section: Experimental Designmentioning

confidence: 99%

Effects of Side Flushing and Multi-Aperture Inner Flushing on Characteristics of Electrical Discharge Machining Macro Deep Holes

Chuvaree

Kanlayasiri

2021

Metals

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This research investigates the effect of machining parameters on material removal rate, electrode wear ratio, and gap clearance of macro deep holes with a depth-to-diameter ratio over four. The experiments were carried out using electrical discharge machining with side flushing and multi-aperture flushing to improve the machining performance and surface integrity. The machining parameters were pulse on-time, pulse off-time, current, and electrode rotation. Response surface methodology and the desirability function were used to optimize the electrical discharge machining parameters. The results showed that pulse on-time, current, and electrode rotation were positively correlated with the material removal rate. The electrode wear ratio was inversely correlated with pulse on-time and electrode rotation but positively correlated with current. Gap clearance was positively correlated with pulse on-time but inversely correlated with pulse off-time, current, and electrode rotation. The optimal machining condition of electrical discharge machining with side flushing was 100 µs pulse on-time, 20 µs pulse off-time, 15 A current, and 70 rpm electrode rotation; and that of electrical discharge machining with multi-aperture flushing was 130 µs, 2 µs, 15 A, and 70 rpm. The novelty of this research lies in the use of multi-aperture flushing to improve the machining performance, enable a more uniform GC profile, and minimize the incidence of recast layer.

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Improving the performance of EDM deep hole using multi-hole interior flushing electrode

Cited by 8 publications

References 7 publications

Improving Machining Performance for Deep Hole Drilling in the Electrical Discharge Machining Process Using a Step Cylindrical Electrode

Improving Machining Performance for Deep Hole Drilling in the Electrical Discharge Machining Process Using a Step Cylindrical Electrode

Influence of Electrical Parameters on the Machining Performance in the Small Hole Drilling by EDM Process

Effects of Side Flushing and Multi-Aperture Inner Flushing on Characteristics of Electrical Discharge Machining Macro Deep Holes

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