Stretch-flanging formability of hard aluminum sheets

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  • アルミニウム硬質材の伸びフランジ性
  • アルミニウム コウシツザイ ノ ノビ フランジセイ

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Abstract

The stretch formability of aluminum sheets for heat-exchangers was investigated. The formability in stretch-flanging and ironing of plate-fins is estimable by a hole-flanging test. A definite correlation lies between the stretch-flanging formability of a pierced hole and local elongation of cold rolled sheets. Stretch-flanging of the pierced hole is almost independent of r-value, n-value and elongation of cold rolled sheets. Local elongation of cold rolled sheets is enlarged when the cell structure transforms to the subgrain structure by recovery and is refined by recrystallization. The sheets having refined subgrain size and grain size allow large local elongation. The subgrain size which corresponds to the cell size is refined by Al3Zr precipitates uniformly dispersed in cold rolled sheets. Burr deteriorates stretch-flanging on a pierced hole to a greater degree. The formability is improved by eliminating burr and fructure zones, where the uniform elongation is a potential factor.

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