共查询到19条相似文献,搜索用时 718 毫秒
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超快速冷却工艺作为热轧钢板生产的核心技术,对改善板材产品组织形态、提升产品性能具有重要意义。在中厚钢板的超快速冷却过程中,心部与表面之间的冷却速度差异使得钢板在厚度方向上形成内外温度差,而超快速冷却中钢板表面的换热机制较为复杂,两者综合提升了中厚板冷却机制的界定难度。为提升中厚板超快冷模型计算精度,完善其换热体系,建立了中厚钢板轧后超快速冷却过程中等效换热系数反求法的数学模型。该模型依托离散解析法,基于导热微分方程及物体正规阶段的状态特点,将求得的超越方程根转化为等效换热系数,并将此作为超快冷温度场模型的边界条件。在此基础上,构建了超快速冷却温度场仿真模型,验证了20 mm钢板超快速冷却机制下的温度场。结果表明,等效换热系数反求法的数学模型能够适用于中厚钢板的超快冷工艺。 相似文献
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Xiao-lin CHEN Guo-dong WANG Yong TIAN Bing-xing WANG GuoYUAN Zhao-dong WANG 《钢铁研究学报(英文版)》2014,21(5):481-487
Taking the element specific-heat interpolation function into account,a one-dimensional(1-D)finite element temperature field model for the on-line control of the ultra fast cooling process was developed based on the heat transfer theory.This 1-D model was successfully implemented in one 4 300mm plate production line.To improve the calculation accuracy of this model,the temperature-dependent material properties inside an element were considered during the modeling process.Furthermore,in order to satisfy the real-time requirements of the on-line model,the variable bandwidth storage method and the Cholesky decomposition method were used in the programming to storage the data and carry out the numerical solution.The on-line application of the proposed model indicated that the deviation between the calculated cooling stop temperature and the measured one was less than±15℃. 相似文献
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结合国内某2250 mm热连轧精轧机组, 实现速度调节、机架间水调节、速度和机架间水耦合调节三种控制模式, 能够根据热连轧过程中的不同钢种和不同工况采用相适应的控制模式, 以获取最佳的控制效果. 同时, 利用二次规划优化法在线优化不同控制模式的调节量, 以满足带钢全长终轧温度的控制要求. 将多模式控制模型在线应用后, 带钢终轧温度控制偏差在±20℃以内, 连续三个月命中率为99%以上. 结果表明, 该控制模型响应速度快, 计算精度高, 能够满足不同钢种和不同工况下的终轧温度控制要求, 从而提高带钢轧制稳定性和终轧温度控制精度, 提升产品竞争力. 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):576-580
Ultra Fast Cooling is a new technology which used to control the hot-rolling strip cooling in recent years on the international developed.It can achieve fast and accurate temperature control in the hot-rolled strip production process to obtain corresponding transformation microstructure and ideal mechanical properties.This article describes the technical principle and layout of ultra fast cooling in hot-rolled as well as cooling features.Analysis the effect of front ultra fast cooling technology in C-Mn steel and obtained consequent on the industrial produced low-cost Q345 hot rolled steel in Panzhihua Iron and Steel. 相似文献
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介绍了620 mm生产工艺流程及超快冷工艺设备.使用超快冷后,通过控制冷却,Q235板坯轧制可以达到Q345B性能,带钢冷却能力可达到230℃,通条温度偏差控制在±15℃以内,可以满足部分钢种使用要求,同时使用超快冷后,带钢表面质量较好. 相似文献
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By measuring the expansion curves of a C-Mn steel at different cooling rates by using an MMS-300 thermo- mechanical simulator, continuous cooling transformation curves were obtained. The new process "ultra fast cooling+ laminar cooling" was simulated and the effects of ultra fast cooling ending temperature on microstructure had also been investigated. The hot rolling experiment was done by adopting "high temperature rolling-[-forepart ultra fast cooling" technologies at laboratory scale. The results revealed that ultra fast cooling can delay the decrease of disloca- tion density and refine ferrite grains. Diversity control of the microstructure and phase transformation strengthening can be realized by changing the ultra fast cooling ending temperature. With the decrease of ultra fast cooling ending temperature, the strength and toughness increase, but plasticity does not decrease obviously. The new technique can improve the yield strength by over 50 MPa. Therefore, the upgrade of mechanical properties of C-Mn steel can be realized by using "high temperature rolling+ ultra fast cooling+laminar cooling" technique. Compared with "low temperature rolling with large deformation degree" technique, this new technology can decrease the roiling force and in- crease the production efficiency. 相似文献
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对某厂的MULPIC超快冷却装置的设备配置、工艺特点及可靠性分析,并就宽厚板实际生产冷却过程中冷后板形不良问题进行了分析,提出了相应的解决措施,旨在提高超快冷却装置对板带冷却的主动适应能力,提高板带冷却的均匀性,达到准确的冷却控制能力。 相似文献
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