Position deviation of bending point in asymmetric V-die bending process with HSS trapezoid sheet

摘要

The prediction of the deviation of bending point in asymmetric V-die bending is extremely needed for practical application. An analytical model and a series of experiments are performed to characterize high strength steel (HSS) sheet metal parts fabricated by asymmetric V-die bending dies and trapezoid sheet. The proposed strategy uses an elementary bending theory to develop a basic model to predict the position deviation of bending point of asymmetric V-die bending process and to test its viability for a trapezoid sheet. Accordingly, a series of experiments obtained good agreement with the calculations. The effects of die radius on deviation in the bending point were experimentally tested to identify the behavior of position deviation in sheet metal bending processes. The experimental results show the important role of contact friction on deviation change; however, its value, i.e., friction coefficient, is always difficult to be determined in calculation. In conclusion, the interactive effects of process parameters are complex and show the important roles of die radius and sheet width on deviation change. The results of this study can be considered when developing process design guidelines for asymmetric processes in HSS sheets.