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为了提高TRIP高强钢板的冲压成形性能,在板料成形基本理论的基础上,通过单向拉伸试验和基于成形极限曲线的Naddrg模型,获得了TRIP600高强钢板的基本力学参数。在分析板料成形失效判据的基础上,提出变压边力成形窗口的建立方法,以圆筒件为例建立了TRIP600高强钢板的成形窗口,通过数值模拟和试验验证了该方法的准确性。结果表明:TRIP600高强钢板同时兼有高强度和高延伸性,但其弹性模量较低;1.2mm厚TRIP600高强钢板的平面应变点FLD0为0.397;成形窗口中的临界起皱变压边力曲线可通过实时调节压边力大小使零件始终处于临界起皱状态而获得;临界破裂变压边力曲线可通过两种极端加载模式获得;该成形窗口的建立能够有效指导TRIP高强钢板的实际冲压生产。
In order to improve the stamping performance of TRIP high strength steel, the basic mechanical parameters of TRIP600 high strength steel were obtained based on the basic theory of sheet metal forming through uniaxial tensile test and Naddrg model based on the forming limit curve. Based on the analysis of the failure criterion of sheet metal forming, a method to set up the forming window of the variable blank holder force was put forward. The forming window of TRIP600 high strength steel sheet was established by taking the cylindrical piece as an example. The accuracy of the method was verified by numerical simulation and experiments . The results show that TRIP600 high strength steel has both high strength and high extensibility, but its modulus of elasticity is low. The plane strain point FLD0 of 1.2mm thick TRIP600 high strength steel is 0.397. The critical wrinkling and deformation BHF of forming window It can be obtained by real-time adjusting the blank holder force so that the part is always in the critical wrinkling condition. The critical breaking blank holder force curve can be obtained by two extreme loading modes. The forming window can effectively guide the actual stamping production of TRIP high- .