水中放電成形の基礎研究

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タイトル別名
  • Fundamental Study on Electrohydraulic Forming
  • スイチュウ ホウデン セイケイ ノ キソ ケンキュウ

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There were many studies on electrohydraulic forming in which the relationship between the deformation of a special metal and the stored electrical energy was investigated. However, it is necessary for us to explain the correlation between the deformation resistance for each of these metals and the pressures in order to analyze the deformation characteristic of metals. The experiments were carried out by means of pressure gage (BaTiO3) on deformation pressures and pressure waves which are directly related to the deformation, and further, the shock wave energies were calculated. The efficiency of these apparatuses is mentioned. The clearance between the electrodes creating pressure is short-circuited with several kinds of fine wire, and the influences of the diameters and lengths of the wires are presented. Also in case there exists water only between the electrodes, the influences of electrod diameters and clearances are presented. It is found from experimental results that such cases where the clearance between the electrodes is short-circuited with a fine wire are superior to the case where water is the only pressure source between the electrodes, and that the aluminum wire which has a low boiling point metal is effective. The rise time of pressure wave is about 5μs and its duration is about 15μs. Such forms of pressure wave does not change up to 1 000 joule stored electrical energy. Shorter wires are better than longer wires as pressure sources, however the diameter of wires creating the largest pressure is limited by characteristic of apparatus and the stored electrical energy.

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