DocumentCode :
2838832
Title :
Determination of Forming Limit Strains in Sheet Metals using an Automated Optical Procedure
Author :
Carasusan, Eusebio ; Canal, Fernando
Author_Institution :
Polithecnic Univ. of Catalonia, Barcelona
fYear :
2006
fDate :
15-17 Dec. 2006
Firstpage :
2943
Lastpage :
2948
Abstract :
Industry is progressing very rapidly as a consequence of continuous technological advances. Rigorous quality control has become an unavoidable step in the chain of production. The forming limit diagram (FLD), a plot of the maximum major principal strains that can be sustained by sheet materials prior to the onset of localized necking, is a useful concept for characterizing the formability of sheet metal. Both experimental and numerical results in the literature have shown that the level of the FLD depends strongly on the strain path. In this work, we purpose a system based on a fast, optical, coordinate acquisition device that calculates all the strain parameters of an industrial piece, to improve the accuracy of FLD determination. Those results are obtained with high accuracy and in real time. An application of this improved system is described: the strain paths on a sheet metal stamped part, during the different stages of the metal forming process, are obtained. These measurements are of great importance, even when the final results are placed below the forming limit curve (FLC). The deformation undergone by the material in some of the forming steps might cause later necking, tearing or localized thinning of the piece.
Keywords :
automatic optical inspection; metal stamping; metallurgical industries; necking; quality control; sheet materials; sheet metal processing; strain measurement; automated optical procedure; deformation; formability; forming limit curve; forming limit diagram; forming limit strains; metal forming process; necking; production chain; quality control; sheet materials; sheet metal stamping; tearing; Capacitive sensors; Inorganic materials; Irrigation; Metals industry; Optical devices; Optical materials; Quality control; Sheet materials; Strain measurement; Time measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Technology, 2006. ICIT 2006. IEEE International Conference on
Conference_Location :
Mumbai
Print_ISBN :
1-4244-0726-5
Electronic_ISBN :
1-4244-0726-5
Type :
conf
DOI :
10.1109/ICIT.2006.372670
Filename :
4237992
Link To Document :
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