Ironing formability of hard aluminum sheets

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  • アルミニウム硬質材のしごき加工性
  • アルミニウム コウシツザイ ノ シゴキ カコウセイ

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Abstract

Ironing formability of hard aluminum, 1100, 3004 and 5052 sheets was studied. O-temper is prefered to hard temper to ensure a large ironing ratio in single stage ironing. While, hard temper such as H18 is prefered to H2-temper or O-temper, in the tandem stage ironing. These facts are related to the quantity of work hardening before ironing and to the strain hardening coefficient n-vaiue. Intermetailic compounds reduce built-up on a die and reduce friction stress. 3004 alloy is preferable to 1100 or 5052 for ironing. Ironing stress has a minimum value to a half die angle. The lublicating condition has influence to the minimum point. The optimum half die angle for 3004-H18 is about 10°.

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