高强钢变强度热冲压成形模具及实验研究

Experimental Study on Tailored Properties Hot Stamping Die for High Strength Steel

随着超高强钢热冲压成形技术在汽车工程中的推广应用,除了提高汽车结构件强度外,人们从不同角度产生了对零件变强度成形中热成形技术应用的关注,即在一次热冲压过程中,使得同一零件在不同部位具有不同的力学性能。从变强度热成形的基本原理入手,选择通过改变模具温度的方式来实现不同冷却路径的方法作为研究对象,探究模具温度、保压力(接触压强)对冷却路径的影响。以平板件为实验对象,设计了符合实验要求的平模实验模具;针对模具温度、保压力设计了相应的实验方案。结果表明,初始模具温度、保压力对冷却速率具有显著的影响,随着初始模具温度的升高以及保压力的降低,板料冷却速率发生明显的下降。

With the ultra-high strength steel hot stamping technology in the automotive engineering in the promotion and application, in addition to improving the strength of automotive structural parts, people from different angles on the parts of the variable strength forming the application of hot forming technology concerns. So that the a parts in different zone have different mechanical properties. In this paper, from the basic principle of variable strength thermoforming, the method of realizing different cooling paths by changing the die temperature is chosen as the research object to explore the influence of die temperature and pressure on the cooling path. With the increase of the initial die temperature and the decrease of the holding pressure, the cooling rate of the slab is obviously decreased.