Bending process in folding operation of aluminum sheets

Abstract

For the precise working in folding operation of aluminum sheets, it is necessary to examine the bending process in more detail.
The following problems are discussed in this paper for this purpose.
(1) Variation of strain with the progress of bending process.
(2) Change in aspect of bending process with the change in clearance.
(3) Comparison between theoretical and experimental values of vertical punching force.
As the results of experiments, it was found that the magnitude and distribution of strain and the displacement of the neutral plane from the middle of sheet thickness largely depended upon the radius of die. The spring back was larger and a better agreement was shown between calculated and experimental values of vertical punching force with the increase in the value of clearance.