Relationships between Bubble Coalescence and Machining Phenomena in Electrical Discharge Machining

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  • IMAI Shinya
    Nagoya Institute of Technology - Department of Mechanical Engineering.
  • HAYAKAWA Shinya
    Nagoya Institute of Technology - Department of Mechanical Engineering.
  • ITOIGAWA Fumihiro
    Nagoya Institute of Technology - Department of Mechanical Engineering.
  • NAKAMURA Takashi
    Nagoya Institute of Technology - Department of Mechanical Engineering.

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  • 放電加工の極間隙における気泡の合一と加工現象の関係
  • ホウデン カコウ ノ ゴク カンゲキ ニ オケル キホウ ノ ゴウイツ ト カコウ ゲンショウ ノ カンケイ

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Abstract

In this study, we observed the bubble coalescence in the electrical discharge machining (EDM) process to investigate the effect of bubble behavior on machining phenomena such as machining stability. A parallel flat gap space composed of a copper rod electrode of 20mm diameter and a transparent plastic plate in which three iron wires of 1mm diameter were inserted was used for the experiment. A series of pulse discharges was ignited in EDM oil and the behavior of bubbles generated in the parallel flat gap space was observed using a high-speed video camera through the transparent plastic plate. It was found that the generated bubbles coalesce with each other during the machining process, and the coalesced large bubble is easily ejected from the edge of the machining surface. It was also found that the jumping motion of the tool electrode promotes the coalescence of the bubbles and the ejection of the coalesced large bubble, which increase the machining stability of the EDM process.

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