张云,黎军顽,李爽,冯全忠,周路海,吴晓春

• 1:上海大学材料科学与工程学院

摘要(Abstract)：

为了评价模具材料的导热性能对热冲压成形工艺的影响,选择优质H13钢和自主开发的HDLM热冲压专用模具材料进行对比分析,采用LF457型激光导热仪对模具材料的导热性能进行评价,使用光学显微镜、扫描电镜和透射电镜对其组织进行观察。同时,建立了盒形件热冲压成形及模内淬火过程的数值仿真模型,研究了模具热导率对成形件冷却行为、组织演变以及模具温度的影响规律。研究表明,在热冲压模具服役温度200~400℃内,HDLM模具钢的热导率高于40 W/(m·℃),约为H13钢的1.5倍;在热冲压保压淬火过程中,模具材料的热导率对热冲压成形件的冷却行为起重要作用;当模具材料为HDLM钢时,仅需约10 s就能使盒形件关键部位的组织完全转变为马氏体,相比于H13钢,其保压冷却时间缩短了近41%,保压冷却效率提升了约80%,有效地加快了热冲压生产节拍和提高了生产效率,并且模具温度的均匀性也有较大改善,最高温度不超过330℃,有利于延长模具的使用寿命。

关键词(KeyWords)： 热冲压;热冲压模具材料;热导率;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家青年科学基金(51401117);; 教育部“卓越工程师教育培养计划”(上海大学金属材料工程专业)资助

作者(Author): 张云,黎军顽,李爽,冯全忠,周路海,吴晓春

DOI: 10.13289/j.issn.1009-6264.2015.s2.043

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