Optimum blank shape of cylindrical cups in deep drawing of anisotropic sheet metals

Zaky, Ayman M.; Nassr, Abo-Bakr; El-Sebaie, M.G.

doi:10.1016/s0924-0136(97)00349-x

Cited by 33 publications

(23 citation statements)

References 4 publications

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“…Este resultado es coherente con los obtenidos por Zaky et al [5] en ensayos de copas de aceros con bajo contenido en carbono, en los que la formación de las irregularidades indicadas ears marca diferenciaciones mayores, comparativamente, entre estas dos direcciones, conforme la razón de embutición aplicada es mayor.…”

Section: Resultados Y Discusiónunclassified

“…En la embutición de formas poco profundas, como carrocerías de automóvil, un valor elevado de favorece que no se produzca ondulación y arrugado de la chapa. La correspondencia entre el coeficiente de anisotropía y la formación de irregularidades en el borde del producto embutido, ears, también ha sido establecida [5] . La dirección del plano en la que el coeficiente de anisotropía es mínimo se corresponde con la existencia de un entrante o zona no prominente (Fig.…”

Section: Introductionunclassified

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A methodology to obtain strain indicators under deep drawing multiaxial stresses. Application to DC-05 electrogalvanized steel (UNE in ISO 10130)

Miguel¹,

Calatayud²,

Ferrer³

2007

Rev. metal.

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146Determinación de los indicadores de deformación bajo tensiones multiaxiales de embutición. Aplicación al acero electrocincado DC-05 (UNE en ISO 10130)* V. Miguel**, A. Calatayud** y C. Ferrer*** ResumenEn este trabajo se establece una metodología para la investigación de la tendencia a la deformación de chapa de acero de alta embutibilidad bajo tensiones multiaxiales de embutición. El método consiste en ensayar chapa en una matriz con forma de cuña produciendo en el material un estado de deformación típico de embutición (pure shear). Se seleccionan tres direcciones de laminación (0º, 45º y 90º) y se establece la deformación en anchura como variable de ensayo. Se ha definido un coeficiente de deformación con el fin de evaluar las variaciones obtenidas en el espesor del material constatándose la no existencia de cambios significativos en éste. También, se obtiene la tensión necesaria para realizar distintas deformaciones estableciendo correlaciones de tipo potencial tensión-deformación. Se contrastan los indicadores obtenidos con el índice de anisotropía y el de endurecimiento del material bajo condiciones normalizadas. La información obtenida permite justificar el comportamiento observado en la embutición de copas de aceros relacionando las diferentes direcciones de laminación con las irregularidades observadas en el borde de las copas embutidas. Palabras claveEmbutición. Anisotropía. Deformación. Rozamiento. Electrocincado.A methodology to obtain strain indicators under deep drawing multiaxial stresses. Application to DC-05 electrogalvanized steel (UNE in ISO 10130) AbstractIn this work a methodology to investigate deep drawing quality steel sheets deformation tendency under multiaxial deep drawing stresses has been proposed. The method consists in assaying a sheet in a wedge die in order to introduce a pure shear estate in the material. 0º, 45º and 90º rolling directions are selected in the assays, and transversal strain is the variable considered in them. A strain coefficient ‰ has been defined in order to evaluate thickness variations in the test. Almost no changes in thickness have been registered and this indicates that strain carried out in the test is similar to that taking place in deep drawing. The stress necessary for practice a certain plastic deformation is obtained too and a potential function between them is formulated. Indicators presented in this work are compared to anisotropy and strength coefficients obtained in normalized tensile tests. These results allow us to justify the steel behaviour in the cup deep drawing processes related to ear forming.

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Section: Resultados Y Discusiónunclassified

Section: Introductionunclassified

A methodology to obtain strain indicators under deep drawing multiaxial stresses. Application to DC-05 electrogalvanized steel (UNE in ISO 10130)

Miguel¹,

Calatayud²,

Ferrer³

2007

Rev. metal.

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“…A theoretical analysis was presented for minimizing earing behavior in cylindrical deep drawing, They used the different blank shape optimization for reducing earings. It was observed that optimized blank shape reduced the punch load using experimental work for aluminum and low carbon steel sheets [11].…”

Section: Introductionmentioning

confidence: 99%

Blank Shape Optimization on Deep Drawing of a Twin Elliptical Cup Using the Reduced Basis Technique Method

Golshani¹,

Jabbari²

2015

Adv. Sci. Technol. Res. J.

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In this project thesis, initial blank shape optimization of a twin elliptical cup to reduce earring phenomenon in anisotropic sheet deep drawing process was studied .The purpose of this study is optimization of initial blank for reduction of the ears height value. The optimization process carried out using finite element method approach, which is coupled with Taguchi design of experiments and reduced basis technique methods. The deep drawing process was simulated in FEM software ABAQUS 6.12. The results of optimization show earring height and, in addition, a number of design variables and time of process can be reduced by using this methods. After optimization process with the proposed method, the maximum reduction of the earring height would be from 21.08 mm to 0.07 mm and also it could be reduced to 0 in some of the directions. The proposed optimization design in this article allows the designers to select the practical basis shapes. This leads to obtain better results at the end of the optimization process, to reduce design variables, and also to prevent repeating the optimization steps for indirect shapes.

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“…Among geometry based approaches for predicting the optimum blank shape, Zaky et al (1998) have used the concept that the values of the normal anisotropy ratioR( ) are not constant over the whole range of crystallographic orientation. Based on the above consideration they have traced out the optimum blank shape starting from the final cup shape.…”

Section: Introductionmentioning

confidence: 99%

Optimal blank shape prediction considering sheet thickness variation: An upper bound approach

Agrawal

Reddy

Dixit

2008

Journal of Materials Processing Technology

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Optimum blank shape of cylindrical cups in deep drawing of anisotropic sheet metals

Cited by 33 publications

References 4 publications

A methodology to obtain strain indicators under deep drawing multiaxial stresses. Application to DC-05 electrogalvanized steel (UNE in ISO 10130)

A methodology to obtain strain indicators under deep drawing multiaxial stresses. Application to DC-05 electrogalvanized steel (UNE in ISO 10130)

Blank Shape Optimization on Deep Drawing of a Twin Elliptical Cup Using the Reduced Basis Technique Method

Optimal blank shape prediction considering sheet thickness variation: An upper bound approach

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