Ultra High Strength Steel U-Shaped Hot Stamping Multi-Objective Optimization Method Based on NSGA-Ⅱ
In order to reduce the springback angle and production cycle of hot stamping U-shaped parts of ultra-high strength steel,a multi-objective optimization method based on NSGA-Ⅱ algorithm was proposed.The variation of temperature and microstructure of ultra-high strength steel with hot stamping process was introduced.A multi-objective optimization model was established to reduce springback angle and stamping cycle.The initial temperature of blank,stamping speed and packing pressure were selected as the ex-perimental factors for optimization.50 groups of sampling points are randomly selected in the optimization space,and the test index parameters are obtained according to the test.A single adaptive neural network is used to regress the model between test indexes and test factors,and a binary coupling NSGA-Ⅱ algorithm is proposed to solve the optimization model.The results show that the average springback angle is27.59%less than the manufacturer's product,the production cycle of single piece is 3.52%,and the standard de-viation of springback angle and production cycle is slightly reduced,which indicates that the production quality,production efficien-cy and production stability are improved after optimization.
U-Shaped Hot Stamping WorkpieceUltra High Strength SteelBinary Coupling ChoosingSingle Adap-tive Neural NetworkMulti-Object Optimization
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