Bending and springback analysis on sheet metal material discontinuity

Origami concept came up as an emerging technique for sheet metal bending or folding and is called as Origami-based sheet metal (OSM) folding. This process fits right in criteria of effectiveness, efficiency, and sustainable manufacturing due to minimal resources required to make the fold or bend. In this process, the line was created on which the bend was supposed to perform. Traditionally the intermittent material was removed from that line with a through cut. Then the bend was performed. During bending the force required was very less and thus it can also be called as easy bend operation. Because the material and removed all the way through the thickness of the metal, these part after bending cannot be used to contain particles smaller than the cut width or liquid solution due to leakage issue. To overcome this issue, this paper investigates the material discontinuities with a blind cut, where the material through the thickness was not completely removed. For this 4 sample types were created. Three additional variables were added in placing the sample during bend operation. Experiments were performed and bending deformation and springback were analyzed. After analyzing the results, it was found that significant thickness difference regions in the sample, smaller clearance, smaller width or cut, and width of cut facing punch are the best variable to have a better bending and less springback.