Researches on the Redrawing of Cylindrical Shells

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  • 円筒容器の再絞り加工
  • エントウ ヨウキ ノ サイシボリ カコウ

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Both the direct and reverse redrawing forces of circular shells were estimated by stress analysis where the thickness and the yield stress of the blank were assumed to be constant over the deforming region and the equivalent stress of the blank was assumed to be in proportion to n power of the equiva1ent logarithmic strain. In the case of redrawing of a cup primarily drawn under practical drawing ratio, intermediate annealing was always favourable for every material. The larger the modulus of work-hardening of the materia1 was, the greater effect the intermediate annealing had. The redrawing ratio was lowered when the plane drawing ratio was increased, whether the intermediate annealing was done or not. The total drawing ratio, however, was raised when the plane drawing was done under higher dra wing ratio. These conclusions were confirmed by experiments on Al, Cu and 70 : 30 Brass.

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