Effects of Temperature on Deep Drawing of Sheet Metals

Kumpulainen, Jarmo; Ranta-Eskola, A. J.; Rintamaa, Rauno

doi:10.1115/1.3225625

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1988

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Deep drawing of polypropylene sheets under differential heating conditions

Machida¹,

Lee²

1988

Polymer Engineering & Sci

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Means of improving the deep drawability of thermoplastic sheets were explored by introducing temperature gradients in the deforming material during deep drawing of initially flat sheets. The specific experimental procedure consisted of either limiting the heating to the flange section of the deforming sheet or exposing the entire material to higher temperatures. At the same time, the initial blank size and the clamping force at the flange section were varied systematically. Both polypropylene and polypropylene with 40 percent calcium carbonate in the form of sheet were tested up to 130°C. It is demonstrated that the draw‐ability increases markedly with increasing temperature gradient between the flange and punch sections. The results of measured strain distribution in the deformed part indicate that the magnitude of temperature difference between the flange and punch sections determines the relative amount of deep drawing and stretching in the wall of the formed part, which in turn dictates the drawability of the material.

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