吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 500-504.doi: 10.13229/j.cnki.jdxbgxb201602025

• 论文 • 上一篇    下一篇

应力状态对模具分区冷却热成形S-rail硬度分布的影响

胡平1, 2, 张金女1, 申国哲1, 林发财1, 刘立忠1   

  1. 1.大连理工大学 汽车工程学院,辽宁 大连 116024;
    2.大连理工大学 工业装备结构分析国家重点实验室,辽宁 大连 116024
  • 收稿日期:2014-07-12 出版日期:2016-02-20 发布日期:2016-02-20
  • 通讯作者: 申国哲(1973-),男,副教授,硕士生导师.研究方向:高强度钢板热冲压工艺与数值模拟技术.E-mail:sgz@dlut.edu.cn E-mail:pinghu@dlut.edu.cn
  • 作者简介:胡平(1956-),男,教授,博士生导师.研究方向:车辆数字化设计制造.E-mail:pinghu@dlut.edu.cn
  • 基金资助:
    "973"国家重大基础研究发展计划项目(2010CB832700); 中央高校基本科研业务费专项项目(DUT11ZD202); 高等学校博士学科点专项科研基金项目(20100041120017)

Influence of stress state on the hardness distribution of S-rail in tailored die quenching process

HU Ping1, 2, ZHANG Jin-nyu1, SHEN Guo-zhe1, LIN Fa-cai1, LIU Li-zhong1   

  1. 1.School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China;
    2.State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
  • Received:2014-07-12 Online:2016-02-20 Published:2016-02-20

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摘要： 利用S-rail模具,以汽车用超高强度钢BR22MnB5为研究对象,结合模具分区冷却热成形工艺研究了模具温度及成形件应力状态对其最终硬度的影响.研究显示:随着模具温度升高,成形件的硬度减小;当模具热区和冷区的温度分别为400 ℃和室温(20 ℃)时,相应区域的硬度分别为300 HV和460 HV,热,冷区之间的硬度出现明显的梯度变化;板料在热成形过程中发生变形,其内圆角处受压应力,抑制马氏体生成,而外圆角处受拉应力,马氏体更易生成,所以外圆角硬度值大于其内圆角硬度值.

关键词: 材料合成与加工工艺, BR22MnB5, 模具分区冷却热成形, 应力状态, 硬度

Abstract: The influences of tool temperature and stress state of stamped part on its hardness distribution are investigated in tailed die quenching process of vehicle-use ultra high strength steel BR22MnB5. The results show that the hardness of the stamped part decreases with the increase in tool temperature. When the tool is heated up to 400 °C, a part with hardness of 300 HV in the hot region and 460 HV in the cold region is produced. Furthermore, during the stamping, the inner fillet of the stamped part is compressed while the outer fillet of the blank experiences tensile stress. So the hardness of the outer fillet is higher than that of the inner fillet in the stamped part.

Key words: materials synthesis and processing technology, BR22MnB5, tailored die quenching, stress sate, hardness

中图分类号: 

  • TG306
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