Production Engineering

, Volume 3, Issue 2, pp 145–156

Strategies to improve the geometric accuracy in asymmetric single point incremental forming

Production Process

Abstract

Asymmetric incremental sheet forming (AISF) is a manufacturing process for the small batch production of sheet metal parts. In AISF, a sheet metal part is formed by a forming tool that moves under CNC control. AISF currently has two dominant process limits: sheet thinning and a limited geometric accuracy. This paper focuses on the latter limit. It is shown with a pyramidal part that multi-stage forming can yield an increased accuracy compared to single-stage forming. However, due to residual stresses induced during forming, the accuracy of the as-formed part can be lost if the part is trimmed after forming. A case study with a car fender section shows that the geometric accuracy of the final part can be improved compared to single-stage forming by a combination of multi-stage forming and stress-relief annealing before trimming.

Keywords

Production process Sheet metal forming Multi-stage forming 

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Copyright information

© German Academic Society for Production Engineering (WGP) 2009

Authors and Affiliations

  1. 1.Institute of Metal Forming of RWTH AachenAachenGermany

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