422 単発放電における金属溶滴のダイナミクス(OS-2 放電加工)

概要

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In single, high current discharge, the tip of thin metal electrode instantly transformed into needle-like shape or spherical shape depending on the discharge conditions and metal. This phenomenon has been studied by a homemade stroboscopic imaging system using a fast pulse laser as a light source. In the discharge with a copper electrode in air, floating metal droplet detached from the electrode tip was observed between the electrode tip and the work piece after discharge. The droplet moved upward during the time interval of several hundred microseconds and then the droplet was reattached to the electrode tip, melted the electrode further and eventually solidified. Speed of the floating droplet after discharge was slower than those of the molten part along the electrode during the discharge or after reattachment. The motion of molten part on the electrode is driven by the surface tension, while the droplet moves by inertia.
一般社団法人日本機械学会の論文
2006-11-24