Abstract
When a bent part is unloaded at a certain stage in a V-bending process, a springback phenomenon does not occur. The purpose of this study was to develop a practical V-bending process to exploit a springback-less phenomenon. The mechanism of this springback-less phenomenon is as follows. Under a certain punch stroke in the V-bending process, the “springback” factor due to tensile stress on the outer side of the bend is precisely balanced by the “spring-go” factor due to tensile stress on the inner side of the bend, which occurs by the unbending of the flange portion of the bent part at the punch shoulder. To realize this bending method, it was shown that it is possible to predict where in the punch stroke the springback-less state will occur, regardless of the thickness and property changes of the sheet metal, and dimensional changes of the bending die. It was also shown that the bending die specifications for a right-angle bending can be predicted on the basis of the thickness and property of the sheet metal. Examination was performed with press brakes attached to a device for measuring the bending load, bending angle and punch stroke. In addition, the FEM simulation of the bending process was carried out.
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