Warm forming of 5182 aluminum alloy sheets into double square sinks.

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  • ５１８２アルミニウム合金板材のダブルシンク形温間成形
  • 5182 アルミニウム ゴウキン イタザイ ノ ダブル シンクケイ オンカン

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The tensile tests of 5182 alloys had been carried out at the warm temperature. The tensile and yield strength decrease, and the local elongation increased with higher temperature. But the elongation to the yield strength, the degree of serration and n-values decrease. The ratio (H/L0) of drawn depth (H) to the square punch side length (L0) are reached to 1.0 in the warm forming that is the limit of die-set, whereas that is reached to 0.27 in the room temperature forming. The optimum temperature of punches, die and blank-holder are shown by the analysis of drawn depth ratios and fracture types. The maximum strain of double square sinks are enormous. The major strain (ε1) is 2.33, and this strain is about equal to deformation in the superplasticity.

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