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Yahagi, Yuna; Koyano, Tomohiro; Kunieda, Masanori; YANG, Xiaodong

doi:10.2493/jjspe.77.394

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…This occurs because the rotation at high speeds allows a more effective flushing of the debris particles and a faster cooling of the tool electrode surface. Moreover, in [7,8] it is demonstrated that the material removal rate and machining accuracy can be improved by increasing the rotational speed of tool electrode up to 50000 rpm. In [9] Kumagai et al improved the deep hole drilling process by using a new electrode made of a rod enclosed in a dielectric pipe to avoid secondary side sparks.…”

Section: Introductionmentioning

confidence: 99%

The Downsizing Effects in EDM Drilling of Micro Holes

D’Urso

Maccarini

Merla

2013

KEM

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The recent miniaturization trend in manufacturing, has enhanced the production of new and highly sophisticated systems in various industrial fields. In recent years, machining of the so called difficult to cut materials has become an important issue in several sectors. Micro Electrical Discharge Machining (micro-EDM) thanks to its contactless nature, is one of the most important technologies for the machining of this type of materials and it can be considered as one of the most promising manufacturing technologies for the fabrication of micro components. One of the most relevant applications of micro-EDM is micro-drilling. Micro holes in fact, are widely used for example in micro-electromechanical systems (MEMS), serving as channels or nozzles to connect two micro-features, and in micro-mechanical components. The present study is about micro drilling of metal plates by means of micro-EDM technology. In particular, the aim of this work is to investigate the effects of the downsizing of the micro holes diameter on the drilling performances. The influence of the reduction of the diameters in terms of both process performances (e.g., tool wear, taper rate, diametrical overcut) and general quality of the holes was investigated. Steel plates having thickness equal to 0.8 mm were taken into account. The drilling process was carried out using a micro-EDM machine Sarix SX 200 with carbide electrodes having diameter equal to 300, 200, 100 and 50 μm. Since the standard electrodes adopted in this study had a diameter equal to 300 μm, a wire EDM unit was used to obtain the other electrodes. The relationship between the process parameters considered the most significant and the final output, was studied. Furthermore, the geometrical and dimensional properties of the micro-holes were analyzed using both optical and scanning electron microscopes. In particular, it is demonstrated that the diameter size has a significant influence on the final value of the diametrical overcut while peak current and frequency parameters have a negligible effect.

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Section: Introductionmentioning

confidence: 99%

The Downsizing Effects in EDM Drilling of Micro Holes

D’Urso

Maccarini

Merla

2013

KEM

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A comparative investigation of drilling and milling micro holes using micro-EDM

Hou

et al. 2016

2016 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3m-Nano)

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Reduction of Tool Wear in Non-contact Electrostatic Induction Feeding EDM

Yahagi

Natsu

Koyano

et al. 2012

IJEM

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In this study, the authors aimed to decrease tool wear ratio in non-contact electrostatic induction feeding for micro electrical discharge machining (EDM). Since this electrostatic induction feeding method is capable of non-contact electric feeding to the tool electrode, the tool electrode can be rotated at a high speeds of 50,000rpm or more. Accordingly, both material removal rate and machining accuracy can be improved. With this method however, since discharges occur with alternating polarity, the tool electrode wear rate is higher than conventional unipolarity pulse discharge where the polarity of the workpiece is positive. Thus, in this study, circuit impedance was switched alternately to decrease the tool wear ratio, so that the discharge peak current becomes high when the workpiece is negatively charged, and low when positively charged. As a result, the tool wear ratio equivalent to conventional unipolarity discharge was achieved.

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Cited by 3 publications

References 2 publications

The Downsizing Effects in EDM Drilling of Micro Holes

The Downsizing Effects in EDM Drilling of Micro Holes

A comparative investigation of drilling and milling micro holes using micro-EDM

Reduction of Tool Wear in Non-contact Electrostatic Induction Feeding EDM

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