Characteristics of Electrical Discharge Machining in a Working Fluid Mixed with Micro-Bubbles

Hideki Takezawa; Kiichi Suzuki; Naotake Mohri

doi:10.4028/www.scientific.net/KEM.625.554

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 625Characteristics of Electrical Discharge Machining...

Characteristics of Electrical Discharge Machining in a Working Fluid Mixed with Micro-Bubbles

Abstract:

Electrical discharge machining (EDM) is a process of removing material by electric discharge in an insulating working fluid. The material is melted by discharge, the material is thought to blown off by the vaporizing explosion of the working fluid. The removal of the material is affected by the expansion and contraction of a bubble. When the power of the vaporizing explosion is large, the amount of material removed increases, and surface roughness decreases. However, when the power of the vaporizing explosion is small, the amount of material removed decreases and surface roughness increases. The power of the vaporizing explosion is determined by the input energy, and the amount of material removed is determined by the degree of the power of the vaporizing explosion. This study considers the changes in the characteristics of EDM by using a working fluid mixed with micro-bubbles. A micro-bubble is defined as a bubble having a diameter of less than or equal to 50 μm. They have special characteristics of causing an increase in the interior gas pressure, resulting in an increase in ion concentration around the gas–water interface. The vaporizing explosion seems to be weakened by the use of a working fluid mixed with micro-bubbles, and surface roughness seems to be improved. Therefore, we performed EDM using pure water and a micro-bubble mixed fluid to clarify the characteristics of EDM.

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Periodical:

Key Engineering Materials (Volume 625)

Pages:

554-558

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.625.554

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Online since:

August 2014

Authors:

Hideki Takezawa*, Kiichi Suzuki, Naotake Mohri

Keywords:

EDM, Machining Removal Rate, Micro-Bubble, Surface Roughness (SR)

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References

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