摘要
设计了一套带冷却系统的热冲压模具,采用设计的模具对硼合金钢板热冲压成形过程进行实验研究,分析了成形过程中板料与模具接触状态对超高强度钢力学性能的影响。结果表明,与传统冷冲压相比,热冲压后的零件回弹角大大降低,可有效地提高成形后零件尺寸精度;硼合金钢板的抗拉强度和屈服强度都得到明显提高,抗拉强度和屈服强度分别达到1400和1000 MPa左右;另外,由于板料/模具界面的冷却条件的影响,热冲压件的抗拉强度和伸长率等力学性能及马氏体组织分布呈现出不均匀的现象,与其他位置相比,零件的侧壁具有更高的拉伸强度和更低的伸长率。
The hot stamping die with a cooling system was designed to investigate the hot stamping process of the boron alloy steel sheet by experiment,and the influences of contact state between the blank and die on the mechanical properties of ultra-high strength steel were analyzed. The results show that comparing with stamping at room temperature,the springback angles are greatly reduced after hot stamping to effectively improve the dimensional precision of parts,and the tensile strength and yield strength of the boron alloy steel sheet are obviously improved after hot stamping to reach around 1400 MPa and 1000 MPa respectively. In addition,it is found that the mechanical properties of tensile strength and yield strength and the martensitic microstructures of the hot stamped part show inhomogeneous phenomenon due to the influence of the cooling condition at the blank/mold interface. Thus,the sidewall of the part is of higher tensile strength and lower elongation compared with other locations.
作者
邹伟
张立强
谭知理
刘灿军
Zou Wei;Zhang Liqiang;Tan Zhili;Liu Canjun(Automobile Engineering Department,Hunan Financial ＆ Industrial Vocational-Technical College,Hengyang 421002,China;College of Mechanical and Electrical Engineering,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2018年第9期174-177,183,共5页
Forging & Stamping Technology
基金
湖南省自然科学基金资助项目(2018JJ2681)
关键词
热冲压
硼钢
回弹
力学性能
马氏体组织
hot stamping
boron alloy steel
spring-back
mechanical property
martensitic microstructure
