Cooling system of hot stamping of quenchable steel BR1500HS: optimization and manufacturing methods
Cooling system of hot stamping of quenchable steel BR1500HS: optimization and manufacturing methods
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DOI：
10.1007/s00170-013-4996-8
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
Hongsheng Liu;C. Lei;Z. Xing
中科院分区：
文献类型：
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作者：
Hongsheng Liu;C. Lei;Z. Xing
新型可淬钢热冲压机主要包括两个阶段：坯料的高温热成形和热冲压件在闭式水冷模具中的淬火。在热冲压过程中的关键阶段是在水冷模具中对热成形的零件进行淬火，以获得最终的高极限拉伸强度。在淬火阶段，热冲压件的冷却速度对热冲压件的最终力学性能有显著影响。因此，本文提出了一种新的方法来优化冷却系统，以提高淬火的有效性，从而最终的热冲压件的机械性能。该方法在模具中引入冷却通道，将热冲压试验与相应的有限元数值模拟相结合，对模具冷却系统进行优化。根据冷却系统的优化，分别采用钻孔法和预埋法制造了用于汽车方盒形件和B柱的两套不同的工装。通过热冲压实验和相应的仿真验证了优化后的冷却系统的有效性。
The innovative hot stamping press of quenchable steel mainly includes two stages: hot forming of blank at elevated temperature and quenching of hot stamped part in closed water-cooled tools. Crucial stage in hot stamping process is quenching of hot formed part in water-cooled tool to achieve final high ultimate tensile strength. In quenching stage, cooling rate of hot stamped part has a significant effect on final mechanical properties of hot stamped part. Hence, in this paper, a new method is proposed to optimize cooling system to improve effectiveness of quenching and thus final mechanical properties of hot stamped part. In this method, cooling channel is introduced in tools, and hot stamping experiments are combined with corresponding finite element numerical simulations to optimize cooling system. According to cooling system optimization, two different sets of tools used to manufacture square-box-shaped part and B pillar of automobile are manufactured using drilling method and pre-embedding method, respectively. Hot stamping experiments and corresponding simulations are performed to verify the effectiveness of optimized cooling system.