Formability Improvement and Prediction of High Strength Steel Based on Controllable Drawbead

The drawing quality could be improved effectively by a reasonable drawbead restraining force,so the controllable drawbead technology was put forward to improve the formability of high strength steel(HSS).The JAC590Y HSS was selected as an example and three different types of drawbead trajectories to the formability effects were investigated by orthogonal tests and numerical simulation.The optimal type trajectory,ascent-halt-descent,was determined according to the limit drawing depth.The main influence factors H1,H2 were obtained by range analysis and the numerical simulation results indicate that the three types of drawbead trajectories can all improve the formability of HSS.Then the genetic algorithm back propagation(GA-BP)neural network of controllable drawbead trajectory factors-limit drawing depth was constructed by test data of the optimal type trajectory.The estimated values of the limite drawing depth were close to the simulation data and the errors were within 5%