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中文摘要：
从理论分析、数值模拟、试验研究上对汽车车身超高强度硼钢热成形技术进行研究。以汽车门内防撞梁热成形为例,分析高温下热成形硼钢的成形性能影响因素及其规律,指出硼钢热成形的最佳温度区间为750～800℃,进而用数值模拟的方法进行门内防撞梁模具工艺设计、用优化仿真的方法确定模具冷却管道设计并通过试验的方法进行确认,最后用设计的模具进行硼钢的拉延成形并对产品进行硬度测试、拉伸试验及金相分析,测试的维氏硬度均大于430,材料的屈服强度为1100MPa,强度极限达到1430MPa,观察到的马氏体组织比较均匀,这些试验结果证明方法的可行性。从而为汽车热成形产品提供了可用于产业化生产、切实可行的一套理论分析、数值模拟及试验研究相结合的技术。
英文摘要：
Theoretical analysis,numerical simulation and experiments of hot forming for ultra high strength boron steel are studied.The hot forming influence of boron steel is analyzed and the best temperature range 750~800 ℃ for hot forming is obtained.Then the design of the reinforced beam＇s die,the cooling system and technique process are implemented by the methods of numerical simulation,optimization and experiments.The experimental results of boron steel components formed by the designed die show that the hardness value presents a homogenous distribution and the Vickers hardness is higher than 430,the yield limitation of the warm forming material is 11 000 MPa,the strength limitation is 1 430 MPa and that the martensite is homogenous.These results indicate the feasibility of the methods.Feasibility methods including theoretical analysis,numerical simulation and experiments are provided to the design of the die and manufacturing process of hot forming for vehicle components.
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