Electromagnetic Tube Bulging by Direct Electrode Contact.

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  • 直接通電電磁成形における円管のバルジ成形
  • チョクセツ ツウデン デンジ セイケイ ニ オケル エンカン ノ バルジ セイ

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Abstract

A method of electromagnetic tube bulging by direct electrode contact is studied. The magnetic pressure is produced by a huge impactive electric current which passes through the electrode contact and the tube. The current is generated by the transient phenomenon of discharge on the condenser bank. An analysis of tube bulging is made using the finite-element method, and a formulation of the finite-element method based on the axisymmetrical membrane shell theory is developed. Impulsive magnetic pressure is assumed as an internal pressure load. The acceleration, velocity and displacement, and the (final profile and strain distribution are given. These agree approximately with experimental values.

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