Deep drawing simulation for highstrength steel box of controllable drawbead
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Abstract:
As blank drawing resistance in sheet metal forming process can be significantly influenced by the changes of drawbead height, and highstrength steel (HSS) is one of the materials difficult to be formed, so a controllable drawbead technology is proposed to improve the formability of HSS. A numerical simulation model and an experimental device of JAC590YHSS box deep drawing with fixed drawbead are established. Comparative analysis of simulation and experimental results show that the difference of fixed height drawbeads has a significant effect on the formability of HSS. A controllable drawbead moving path of ascenthaltdescent is designed based on the variations of deep drawing force in the sheet metal forming process. Then the path is applied to the formation of an automobile engine tunnelside panel which is similar to the box deep drawing. Twenty group test schemes of good formation are obtained, in which the part smallest thickness is significantly influenced by controllable drawbead. Moreover, in the twenty group test schemes, the optimized combination of moving path and main influence factor H2 are found by range analysis of part average smallest thickness. Finally, the correlation between part smallest thickness and factor H2 is predicted by using GABP neural network and regression analysis.
