Improvement of formability of aluminum alloy sheets using emboss and restoration process

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  • エンボス・リストレーション加工によるアルミニウム合金板の成形性向上
  • エンボス リストレーション カコウ ニ ヨル アルミニウム ゴウキンバン ノ セイケイ セイコウ ジョウ

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Abstract

Using thinner sheet metal is effective in making the products with low cost and light weight. It also contributes to saving the energy and resources on earth. However, the rigidity and formability of sheet metal decrease when the thickness of sheet becomes thinner. Emboss process and restoration process can locally change the shape of a sheet metal, and also add partial work hardening. Therefore, there are some possibilities that the formability of thinner sheet metal is improved by these processing, like as the rigidity. In this study, emboss processes and restoration processes were conducted to the aluminum alloy sheet. The variations of the strength and formability of the aluminum sheet by these processing were investigated. The results showed that the yield stress of the sheet changed and the total elongation increased by performing these processing. On the basis of these results, the improvement of the formability of sheet metal was attempted by emboss process, restoration process and combination of these. The Erichsen cupping test and the deep-drawing test were conducted to the sheets having some processing patterns. From the result, it was confirmed that it was possible to improve the formability of sheet metal by adopting emboss process and restoration process properly.

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