Occurrence and numerical prediction of surface defects during flanging of metallic sheets

Port, A. Le; Thuillier, Sandrine; Manach, Pierre‐Yves

doi:10.1007/s12289-009-0677-4

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…For rail-shape stampings which are made of high strength steel, spring back is a concern specially from assembling point of view [18,19]. Spring back is very important for the final appearances of sheet metal forming products which are related to the exterior appearance of automobile or automotive industry such as hemming [20,21]. In manufacturing of sound and accurate pipes from high and ultra high strength steel, spring back play an important role [22].…”

Section: Introductionmentioning

confidence: 99%

Investigating spring back phenomena in double curved sheet metals forming

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Investigating spring back phenomena in double curved sheet metals forming

et al. 2012

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“…The shapes of the profiles are well simulated but the vertical amplitudes are underestimated and the defect depth of 80 µm becomes 40 µm. The use of shell elements allows to predict a slightly larger depth [4].…”

Section: Numerical Simulationsmentioning

confidence: 99%

Experimental study of surface defects on automotive doors during flanging and their numerical prediction

Port

Thuillier

Manach

et al. 2010

EPJ Web of Conferences

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Abstract. Surface defects can develop on automotive exterior panels after drawing and flanging steps, during springback and may alter significantly the vehicle quality. These defects are characterized by a depth below 0.5 mm and are then difficult to detect or predict numerically. This study focuses on a L-shaped part designed on purpose to reproduce at a small scale surface defects that occur after flanging. Dimensions of these defects are measured from profiles obtained with a tridimensional measuring machine. The investigation of the influence of the flanging height and flanging speed shows than neither of these parameters have impact on the surface defect . The numerical simulation of the flanging process predict the surface defect but with a lower depth than the experimental defect.

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“…It can also develop in the the fuel filler lid area [4]. Another kind of surface defect develops on upper corner of doors [1], which is the type focused on this paper.…”

Section: Introductionmentioning

confidence: 96%

“…Nevertheless, they can also develop at the flanging stage [1]. Reducing the thickness of body parts using high-strength steels is an efficient way to achieve that goal, but it raises several problems, such as increasing the severity of surface defects.…”

Section: Introductionmentioning

confidence: 99%

Surface defects on thin sheets after flanging

Port¹,

Thuillier²,

Manach³

et al. 2011

AIP Conference Proceedings

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Several surface defects can develop on automotive exterior panels during the forming operations. They alter the vehicle aesthetic and their severity increases with the decrease of sheet thickness. These defects are difficult to characterize experimentally and reproduce numerically because of their depth below 0.5 mm and the complexity of the parts on which they develop. This study proposes a method that uses curvature of profiles to detect and characterize surface defects. The method has applied to a laboratory case to study the influence of tool parameters. Numerical simulations have been carried out and lead to a minimization of the severity of surface defects, but they allow to reproduce their shape.

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Occurrence and numerical prediction of surface defects during flanging of metallic sheets

Abstract: International audienc

Cited by 13 publications

References 8 publications

Investigating spring back phenomena in double curved sheet metals forming

Investigating spring back phenomena in double curved sheet metals forming

Experimental study of surface defects on automotive doors during flanging and their numerical prediction

Surface defects on thin sheets after flanging

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