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Patent

Stamping of work hardenable aluminum alloy sheets

TLDR
Work hardenable aluminum alloy sheet material is progressively stamped to a final stamped shape in a succession of stamping operations as mentioned in this paper, where a blank sheet of annealed starting material is stamped into a least a first preform shape between heated stamping tools to form a pre-form shape and subsequently anneal the worked preform shapes.
Abstract
Work hardenable aluminum alloy sheet material is progressively stamped to a final stamped shape in a succession of stamping operations. A blank sheet of annealed starting material is stamped into a least a first preform shape between heated stamping tools to form a preform shape and subsequently anneal the worked preform shape. After one or more annealed preform shapes have been progressively attained, the last preform shape is cooled, if necessary, and stamped to its final stamped shape between unheated stamping tools.

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Method for producing a structural sheet metal component, and a structural sheet metal component

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References
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Patent

Process for stretch forming age-hardened aluminium alloy sheets

TL;DR: In this article, the stretch formability of a sheet (10) of age-hardened aluminum alloy is increased by selectively heat treating the sheet to soften at least a portion of the sheet that will underlie a punch surface.
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TL;DR: In this article, the shape of the desired part is analyzed to identify portions of the geometry that cannot be formed in a single stamping step without exceeding the straining limit of the metal.
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