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Title of Journal: Int J Mater Form

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Abbravation: International Journal of Material Forming

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Springer-Verlag

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DOI

10.1016/j.annfar.2013.07.678

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1960-6214

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Prebulging influence on an inverse drawn shape ob

Authors: G Papadia A Del Prete A Spagnolo A Anglani
Publish Date: 2010/06/12
Volume: 3, Issue: 1, Pages: 287-290
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Abstract

The HDD process performance and the quality of the formed parts can be influenced by many process variables such as fluid pressure blankholder force prebulging pressure friction and punch speed 1 Many studies report how prebulging characterization may be done in accordance with the fluid pressure variation 2 or with the maximum bulge height 34 value In this paper the authors use the maximum bulge height to characterize prebulging levels influence on the process feasibility The effects of three different prebulging levels as well as the traditional geometric and process parameters on a specific component characterized by an inverse drawn shape have been analyzed In the experimental phase for each considered process condition the Thickness Reduction TR has been detected on the formed component in sixteen different points of interest to verify numerical and experimental correlation The good accuracy shown by the numerical model allowed to develop an appropriate numerical campaign to obtain an ANOVA analysis to evaluate the prebulging heights influence on TR distribution The obtained results have shown that the prebulging height influences the TR distribution significantly but in a less way than punch radius and blankholder forces profile

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