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Investigations of thickness distribution in hole expanding of thin steel sheets

100%

Frącz W. , Stachowicz F. , Trzepieciński T.

tom Vol. 12, no. 3

279--283

This work aims to investigate the effect of punch geometry on the sheet thickness distribution in the collar formed during hole-flanging process. Three different punch geometries: cylindrical (flat-bottomed), hemispherical and conical were used in the experiment as well as in numerical simulation. Extra deep drawing quality (EDQ) steel sheet with a thickness of 1.0 mm was selected for this work. The results of experimental investigations were compared with the results of numerical modeling performed using the FE based MSC.Marc +MENTAT computer code.

Material flow law and mechanical property of 5052 aluminum alloy sheets under dynamic and quasi-static hole-flanging

100%

Zhang L. , Cui X. , Yan Z. , Yang G.

tom Vol. 23, no. 3

art. no. e203, 2023

The formability of aluminum alloys at room temperature is low, which can lead to the fracture of the sheets under traditional stamping. In this work, electromagnetic forming (EMF) and stamping flanging of 5052 aluminum alloy sheets were performed by experimentally and 3D numerical simulation. Under stamping flanging, when the prefabricated hole diameter decreases, the flanging height increases, but the gap between the flanged part and die and maximum thinning rate becomes larger. With the increase of discharge voltage, the fittability of the flanged parts is improved. There is a critical discharge voltage, under which the fittability and maximum thinning rate are optimal. Compared with stamping, the sheet flanging height is larger under EMF. This is due to the inner and outer layers of sheet fillet are subjected to greater radial tensile strain, and the thickness of sheet fillet are reduced after EMF. In addition, the sheet mouth collides with die at high speed, which causes the mouth material extend radially. The results revealed that the hardness of outer and middle layers at the sheet fillet was larger after EMF than that after stamping, while that of the inner layer was relatively small. This distribution of hardness corresponds to material strain.