グラファイト電極を用いた高効率放電加工法に関する研究

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タイトル別名
  • High Efficiency Electrical Discharge Machining with Graphite Electrode
  • グラファイト デンキョク オ モチイタ コウコウリツ ホウデン カコウホウ ニ カンスル ケンキュウ

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High speed cutting of metal mold by machining center has recently been developed, and it has gradually taken the place of EDM, since the machining efficiency of EDM process is smaller than that of cutting one. From this point of view, higher efficiency EDM is greatly expected to be realized. However, EDM's ability has never been sufficiently displayed, since the machining condition is usually set to avoid the unstable machining. In general, excessive stagnation of debris between the electrode and workpiece leads to an occurrence of arc phenomenon and a generation of heat resolved carbon. Therefore, the exclusion of debris from the working gap is very important for stable machining. It has conventionally been carried out with absorbing or flushing of dielectric fluid through the holes drilled in the electrode or the workpiece, or jumping motion of the electrode. However, these methods have disadvantages such as the time necessary to machine holes or the low machining efficiency.<br>In this study, a new excluding method of debris using the rapid flow due to evaporation of dielectric fluid is proposed, and the EDM characteristics of this method are experimentally discussed. As a result, it was made clear that higher efficiency EDM can be attained by this method and that debris can be smoothly removed when the discharge current is large, the gap is narrow and the pulse interval time is short as far as the machining is stable.

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