Study on compensation control for bending-twist composite springback of advanced high-strength dual phase steel
Aiming at the prediction and compensation problems of bending-twist composite springback of advanced high-strength dual phase steel,the finite element model was established based on bending-twist composite springback test,and the simulation was carried out.Firstly,the unidirectional tensile test and load-unload-reverse load tensile-compression tests were carried out to determine the me-chanical properties of DP600 by the large springback characteristic of DP600 in bending-twist composite springback test.Secondly,four kinds of elastic-plastic material models provided by Ls-dyna were used to establish the finite element models of unidirectional tension and tension-compression tests,and the appropriate material models and parameters were screened out through Ls-opt iteration solving.The re-sults show that the predicted values using MAT125 material model are closer to the bending-twist composite springback test data.Finally,the movement formula of the bottom support distance was deduced by the reverse section compensation method,and the die surface was obtained by the reverse displacement compensation method and offset surface to compensate the bending-twist composite springback re-sults.It is found that the induced bending-twist composite springback can be effectively compensated and controlled as the deflection angle of the upper press bar increases by using the reverse displacement compensation method and offset surface.
万方数据
维普
