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  4. Influence of global forced-air warming on the bulge formation in shallow sloped SPIF parts
 
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2017
Journal Article
Title

Influence of global forced-air warming on the bulge formation in shallow sloped SPIF parts

Abstract
Shallow sloped single point incrementally formed (SPIF) parts typically show undesirable geometric deviations from the designed shape due to accumulated unwanted bulging. In this study, the effect of global warm forming using a forced- air flow, on the geometric accuracy of low-angled parts with a conical geometry is investigated. The finite element (FE) model is developed to simulate the SPIF process at elevated temperatures. The simulation results show that the sheet metal is subjected to significantly higher levels of stress in cold forming condition with respect to parts formed at elevated temperatures. Due to the increase in strength caused by strain hardening, a larger area of the sheet (both in the wall and bulge regions) is affected by the tool during forming at room temperature. Softening of the material by warm forming reduces the strain hardening and extended straining of the part which results in a reduction of the bulge height and under-forming of the cone base.
Author(s)
Mohammadi, Amirahmad
KU Leuven, Department of Mechanical Engineering
Vanhove, Hans
KU Leuven, Department of Mechanical Engineering
Weise, Dieter  
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Bael, Albert van
KU Leuven, Department of Materials Engineering
Landgrebe, Dirk
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Duflou, Joost R.
KU Leuven, Department of Mechanical Engineering
Journal
Procedia Engineering  
Conference
International Conference on Sheet Metal (SheMet) 2017  
Open Access
DOI
10.1016/j.proeng.2017.04.046
Additional full text version
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Language
English
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Keyword(s)
  • single-point incremental forming

  • global heating

  • FE modeling

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