Deformation Analysis of Springback in L-Bending of Sheet Metal
Resource
ADVANCED SCIENCE LETTERS, 4(6-7), 1928-1932
Journal
Advanced Science Letters
Pages
1928-1932
Date Issued
2011
Date
2011
Author(s)
Ko, Shen-Fu
Abstract
In the present study, the deformation mechanics of the springback phenomenon in the L-bending of sheet-metal was examined by both the finite element analysis and experiments. The axial stress distribution in the bent sheet obtained by the finite element simulations was classified into three zones: flat zone under the blank-holder (zone I), bending zone at the die corner (zone II), and unbending zone at side wall (zone III). It is found that the stress distribution in zone I is quite uniform and hence has little influence on the springback. While the stress distribution in zone II results in a positive springback, and the stress distribution in zone III produces a negative springback. The total springback therefore depends on the combined effect of those stresses produced by zone II and zone III. A reverse bend approach was also proposed to reduce the springback in the L-bending process. The efficiency of the proposed approach was demonstrated by the finite element simulations, and was validated as well by the experiments conducted in the present study. © 2011 American Scientific Publishers.
Type
journal article
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