Study on the dry electrical discharge machining

Abstract

The dry electrical discharge machining is considered by the researchers as an environment friendly machining process and different specific aspects of this machining method are presented in the specialty literature. To obtain holes by electrical discharge machining, tubular rotating electrodes tools could be used. The paper presents a relatively simple device proposed to be used for applying the dry electrical discharge drilling. The rotation of the electrode tool could contribute to the diminishing of the errors of the circular shape in a cross section through the hole. Some preliminary experiments proved the possibilities to use this device to achieve holes in workpieces of low thickness. Test pieces made of stainless steel were machined by dry EDM and by common EDM. For the applied operating conditions, the dry electrical discharge drilling presents some advantages regarding the machined surface quality and the electrode tool wear, in comparison with the machining that uses liquid dielectric.

Soğutma Sıvısında Çözünen Oksijenin Elektro Erozyonla Delinen Deliklerin Performans Parametrelerine Etkisinin İncelenmesi

“…Deneyler 3'er tekrarlı yapılmış ve her delikten 3'er ölçüm alınarak ortalamaları performans değerleri olarak kullanılmıştır. Tüm deneylerde sabit sıcaklıkta (22 o C) dielektrik su soğutma sıvısı olarak kullanılmıştır. Bu çalışmada elektro erozyon parametreleri; akım (I), ark süresi (T on ) ark bekleme süresi (T off ), ve kapasitans (C) değerlerinin seçiminde Eyercioglu ve arkadaşlarının [26] …”

Review on Recent Development in Environmental-friendly EDM Techniques

“…Results indicated that, open voltage, pulse duration, the amplitude of ultrasonic actuation, the discharge current, and the lessening of the wall thickness of electrode pipe are the significant factor for increasing the material removal rate. Besliu et al [12] studied dry EDM and performed experiments using liquid as well as the compressed air dielectric. Results showed that in the dry EDM process, electrode tool wear is better than wet EDM during particular operating conditions.…”

“…Results showed surface finish improved from 44μ Ra to 36μ Ra. Besliu et al [12] studied dry electrical discharge machining and find that the errors of the circular shape in a cross section through the hole may be reduced by rotation of the electrode tool. 3.3 Surface Integrity and Modeling Techniques Domenico Umbrello [34] performed experiments to analyze formations of white layers during machining of hardened AISI 52100 steel under dry and cryogenic cooling conditions.…”

“…It further advises that the ABC algorithm for can also used for the optimal solution sets. Skrabalak and Kozak [17] presented results of simulation and mathematical modeling of the material removal rate of electro discharge milling process with compressed air as a dielectric. The finding hints that in case of DEDM milling, with thin layers the problem of particles attaching the electrode is negligible, as the elimination of the atoms from the working gap is relatively soft.…”

“…Nevertheless, when hydrocarbon oil is used, health, safety and the environment become important aspects [11]. Present research focus on development of no-polluting technique, which protect the environment and facilitate substantial high MRR, low TWR, surfaces accuracy and minimum roughness values [12].…”