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为深入研究超高强度钢板热冲压成形工艺,采用热-力-相变耦合分析方法,建立B柱热冲压模型,进行成形工艺全过程仿真。分析加热、送料、冲压成形、淬火冷却等工艺环节中板坯的热力学及相变行为,给出了板料温度、厚度、组织等变化的分布规律,为热冲压模具设计及工艺参数优化提供理论依据。提出通过合理控制冷却速率,获得多相组织混合产物,满足强度和塑性相结合的需求,改善热成形零件的综合力学性能。模拟结果与实验较吻合,表明所建立的热-力-相变耦合模型是可靠的。
In order to further study the hot stamping forming process of ultra-high strength steel plate, a hot stamping model of B-pillar was established and the whole process simulation of the forming process was carried out by the coupled method of thermo-force-phase transition analysis. The thermodynamics and phase transition behavior of slab during heating, feeding, stamping, quenching and cooling were analyzed. The distribution of temperature, thickness and microstructure of the slab was given. The theory and method of hot stamping die design and process parameter optimization in accordance with. It is proposed that the comprehensive mechanical properties of thermoformed parts should be improved by reasonably controlling the cooling rate and obtaining the mixed product of multiphase microstructure to meet the demand of the combination of strength and plasticity. The simulation results are in good agreement with the experiments, which shows that the established thermo-mechanical-phase transition coupling model is reliable.