Subtle cosmetic defects in automotive skin panels
Hazra, S. (Sumit), Williams, D., Roy, R., Aylmore, R. and Smith, A. (2009) Subtle cosmetic defects in automotive skin panels. In: 13th International Conference on Sheet Metal, Birmingham City Univ, Birmingham, England, April 06-08, 2009. Published in: Key Engineering Materials, Vol.410-411 pp. 197-205.Full text not available from this repository.
Official URL: http://dx.doi.org/10.4028/www.scientific.net/KEM.4...
Cosmetic defects such as 'hollows' are the result of deviations in a skin panel. These deviations are usually too small and local to be detected by discrete measurements of the panel but become visually apparent after the application of paint. As a result, the perceived quality of a panel may become unacceptable and considerable time may be dedicated to minimizing their occurrence through tool modifications. This paper proposes that there are three aspects to the problem: the springback or buckling of the panel, the optics of the painted panel and the ability of an observer to perceive the defect. In particular, it will be argued that hollows cause optical distortions that inform the human eye of the presence of a defect. The paper then suggests that signal processing techniques, in particular the wavelet transform, provide a simple way of locating and quantifying the severity of these defects. The transform was applied to two physical parts and a simulation model.
|Item Type:||Conference Item (Paper)|
|Subjects:||T Technology > TP Chemical technology
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)|
|Series Name:||Key Engineering Materials|
|Journal or Publication Title:||Key Engineering Materials|
|Publisher:||Trans Tech Publications Ltd|
|Editor:||Shirvani, B and Clarke, R and Duflou, J and Merklein, M and Micari, F and Griffiths, J|
|Number of Pages:||9|
|Page Range:||pp. 197-205|
|Access rights to Published version:||Restricted or Subscription Access|
|Conference Paper Type:||Paper|
|Title of Event:||13th International Conference on Sheet Metal|
|Type of Event:||Conference|
|Location of Event:||Birmingham City Univ, Birmingham, England|
|Date(s) of Event:||April 06-08, 2009|
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