Expansion Forming of Metallic Foam Parts from Foamable Beads or Wires.

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  • 発泡性ビーズ／ワイヤーを素材とした金属フォーム部品の発泡同時成形法
  • ハッポウセイ ビーズ ワイヤー オ ソザイ ト シタ キンゾク フォーム ブヒ

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Abstract

An expansion forming technique for the production of foamed cellular metal parts with very low apparent densities has been studied. Gas-tight fully densed beads and wires made from Pb-30Sn powder mixed with a powdered foaming agent, oxibisbenzenesulfonylhydrazide (OBSH), are used as a foamable raw material. Expansion forming into porous cellular parts is successfully performed by heating the foamable raw materials in a die to decompose the foaming agent to evolve gas and to adhere to each other. The foamable wires applied in a die show an expansion to the radial direction to fill the die cross-section which is followed by an expansion in the longitudinal direction, and have the advantage of single-bar preform to achieve a complete fill to the die cavity. As released gas staying in the die cavity leads to insufficient filling, supply of the raw materials and/or adding of the foaming agent play important roles especially in a closed die forming in which foamable beads are applied.

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