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.
Highlights
Nowadays tool makers for the automotive industry are concerned about surface defect problems occurring on opening parts like doors
It is noticed from experiments that surface defects, which are characterized by a local inversion of the curvature, develop during springback following the drawing stage, and the flanging stage
Characterization of surface defects of automotive opening parts is the main aim of this study
Summary
Nowadays tool makers for the automotive industry are concerned about surface defect problems occurring on opening parts like doors. It consists of a depression in the corner radius area and two bulges along the flanged edges. By plotting profiles along the x axis for several y values (Fig. 7) the surface defect presents a depth of 80 μm, a length of 70 mm and an approximate width of 36 mm.
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