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zoe122208木虫 (正式写手)
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| 高强钢板热冲压技术是实现汽车的轻量化，达到节能、减排的有效途径。热冲压件的成形性通常采用成形极限进行判定，然而常规热冲压成形极限均由多条等温成形极限线组成，难以描述变温过程钢板的成形性，且目前存在的成形极限图没有考虑相变行为对热冲压件成形极限的影响。项目以B1500HS先进高强钢为研究对象，通过Gleeble-3500热模拟试验机，揭示高强钢板热变形材料流动规律、推导热成形指数，建立材料考虑温度和应变速率的本构方程。采用DIC技术获取高强钢板相变温度以上的极限应变值，采用四点特征法建立材料相变温度以下的成形极限线，进而研究相变行为对热成形极限的影响。基于所获得的热成形极限数据，采用BP神经网络和插值算法构建三维成形极限图。设计盒型件热冲压模具，通过工艺试验对三维成形极限图进行定性、定量评估。本项目的实施旨在探索高强钢相变行为对热成形极限的影响规律，建立适用于高强钢板热冲压件的成形极限图，为国产高强钢在现代汽车领域的应用奠定基础。 |
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铁杆木虫 (正式写手)
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zoe122208: 金币+100, 翻译EPI+1, ★★★★★最佳答案 2014-02-28 10:55:08
zoe122208: 金币+100, 翻译EPI+1, ★★★★★最佳答案 2014-02-28 10:55:08
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Hot pressing technology of high strength steel plate is an effective approach to realising vehicle weight minimisation for energy conservation and waste reduction. The formability of hot pressed pieces is generally assessed by means of forming limits. However, since common hot pressing forming limits are made up of multiple isothermal forming limit lines, it is difficult to describe the formability of steel plate with varying temperatures. Moreover the exiting forming limit graphs today do not take into consideration of the impacts of phase change phenomena on the forming limits of hot pressed pieces. This project studies the advanced high strength steel B1500HS by means of Gleeble-3500 thermal simulation test facility to explore the material movement during thermal deformation for high strength steel, derive hot forming index and establish the constitutive equation considering temperature and strain rate. DIC technology is used to obtain the limit strain values for high strength steel plates above the phase transition temperature and 4-point characteristic method is used for setting up the forming limit lines of the material below phase transition temperature so that the impacts of phase transition on hot forming limits. Based on the obtained hot forming limit data, use of BP neural network and interpolation algorithm is made to construct three dimensional forming limit graphs. Hot press molds for box type pieces are designed and through process tests the three dimensional forming limit graphs are evaluated both qualitatively and quantitatively. The objectives of the project is at exploring how phase transition of high strength steel impacts the hot forming limits and establish the forming limit graphs appropriate for hot presses pieces from high strength steel plates, in order to lay the foundation for applications of home-made high strength steel to modern vehicles. 供参考，不妥见谅 |
2楼2014-02-28 10:03:13