锻压技术

热冲压成形工艺参数对硼钢板帽形件回弹影响分析

英文标题：Effect of hot stamping process parameters on springback of hat-shaped boron steel parts

单位：同济大学吉利汽车研究院

关键词：热冲压回弹马氏体相变帽形件

分类号：TG386

出版年,卷(期):页码：2014,39(3):34-37

摘要：

热冲压技术是指板料在高温成形后进行保压淬火，此过程伴随着温度快速降低，材料屈服强度升高，弹性模量变大，并约在300~400 ℃时，组织开始由奥氏体向马氏体转变，零件应力应变场逐步改变。最终开模时，零件会产生一定回弹。针对这种复杂的过程，探讨了保压时间、板料厚度等热冲压工艺对于帽形件回弹的影响。通过试验测量了不同热冲压工艺下硼钢板帽形件的回弹量。研究表明，保压时间越长，回弹越小，并最终稳定在一定范围，且板料越薄，回弹减小。

Hot stamping is a process that blanks are formed at high temperature with subsequent quenching under pressure. It is accompanied by rapid temperature reduction，significant material yield strength enhancement as well as elastic modulus increase. At 300-400 ℃, the austenite transforms to martensite,meanwhile the stress and strain field change gradually. When the die opens at the end of hot stamping,the workpiece will have some amount of springback. For this complicated process,the influences of holding time and sheet thickness on hat-shaped piece springback were investigated, and the springback of hat-shaped part under different hot stamping processes was measured.The results show that the springback decreases with the increasing of press holding time, and eventually stabilizes in a relative range. The thickness of blank becomes thinner, the amount of springback becomes less.

基金项目：

国家自然科学基金项目(51075307);国家科技支撑计划资助项目(2011BAG03B02)

参考文献：

［1］林建平，孙国华，朱巧红，等.超高强度钢板热成形板料温度的解析模型研究[J]. 锻压技术,2009,34(1):20-23.Lin Jianping,Sun Guohua,Zhu Qiaohong,et al. Research on analytical model of blank temperature prediction for hot stamping of ultra high strength steels[J]. Forging & Stamping Technology, 2009,34(1):20-23.
［2］刘红生，包军，邢忠文，等.22MnB5超高强钢板热成形中的回弹机理分析[J]. 航空学报，2010, 31(4):865-870.Liu Hongsheng,Bao Jun,Xing Zhongwen,et al. Analysis of mechanism of springback in 22MnB5 super-high strength steel forming[J]. Acta Aeronautica Et Astronautica Sinica, 2010, 31(4):865-870.
［3］Liu H S,Xing Z W,BaoJ,et al. Investigation of the hot-stamping process for advanced high-strength steel sheet by numerical simulation[J]. Journal of Materials Engineering and Performance,2010,19(3): 325-334.
［4］郭幼丹，吴春笃，程晓农.基于相变与回弹的热冲压成形冷却过程控制[J]. 塑性工程学报，2011，18(5): 70-73.GuoYoudan,Wu Chundu,Chen Xiaonong. The cooling process control based on phase changing process and springback during hot stamping forming[J]. Journal of Plasticity Engineering, 2011,18(5): 70-73.
［5］姜超，单忠德，庄百亮，等. 初始成形温度对超高强钢热冲压件力学性能的影响[J]. 金属热处理， 2011，36(12): 66-69.Jiang Chao,Shan Zhongde,Zhuang Bailiang,et al. Effect of initial deformation temperature on mechanical properties of ultra-high strength steel hot stamping parts [J].Heat Treatment of Metals, 2011,36(12): 66-69.
［6］Mori K,MakiS,Tanaka Y. Warm and hot stamping of ultra high tensile strength steel sheets using resistance heating[J]. CIRP Annals-Manufacturing Technology，2005，54(1): 209-212.
［7］朱巧红. 热成形模具热平衡分析及冷却系统设计优化[D].上海:同济大学，2007.Zhu Qiaohong,Heat Balance Analysis of Hot Stamping and Optimizing Design of Cooling System[D].ShangHai:Tongji University,2007.
［8］Naderi M, Durrenberger L, Molinari A, et al. Constitutive relationships for 22MnB5 boron steel deformed isothermally at high temperatures[J]. Materials Science and Engineering: A, 2008, 478(1): 130-139.
［9］Somani M C, Karjalainen L P, Eriksson M, et al. Dimensional changes and microstructural evolution in a B-bearing steel in the simulated forming and quenching process[J]. ISIJ International, 2001, 41(4): 361-367.
［10］Merklein M,Lechler J. Investigation of the thermo-mechanical properties of hot stamping steels[J].Materials Processing Technology,2006,177(1-3):452-455.
［11］Taleb L, Petit S. New investigations on transformation induced plasticity and it`s interaction with classical plasticity[J]. International Journal of Plasticity,2006,22(1):110-130.
［12］Bardelcik A, Salisbury C P, Winkler S, et al. Effect of cooling rate on the high strain rate properties of boron steel[J]. International Journal of Impact Engineering, 2010, 37(6): 694-700.

服务与反馈：

【文章下载】【加入收藏】