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基于大方坯连铸生产中的大量实测数据,分析了结晶器冷却水温差与拉速、钢水过热度和结晶器水流量等工艺参数的变化关系,并利用多元统计方法进行线性回归分析得到定量规律;明确了冷却水温差在连铸监控中的功能,并用于指导连铸冷却工艺的制定与优化;使用均值滤波法对水温差的数据进行实时滤波,用以保证连铸坯在线动态热跟踪模块计算的准确性和稳定性,实践表明该方法的必要性与有效性。 相似文献
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针对冷轧宽带钢连续热镀锌生产线上的拉矫机,为了建立可针对不同钢种、规格、来料板形的拉矫机插入深度、延伸率和工艺张力等重要工艺参数的设定模型,结合对拉矫变形过程的力学分析和现场实测数据统计与分析的结果,从板形良好的钢卷中择取有代表性的生产数据作为训练样本,将良好的操作经验转化为数学模型,利用BP网络模型的自适应和自学习优势设定带钢拉矫过程中的工艺参数。此模型可以将新的样本随时添加到网络的矩阵中,对新品种具有较好的扩展能力。经现场试用表明,它能准确地预设定拉矫机工艺参数,基本满足工厂生产要求。 相似文献
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多年来,各种铸铁轧辊的主要浇铸工艺参数基本上凭经验选取,难免出现选用不当而产生铸造废品,降低了轧辊的使用寿命。本文以实践为依据,经过大量的数据统计分析后,提出了影响铸铁轧辊铸造合格率和轧辊实物质量的主要浇铸工艺参数的计算方法,并对这些主要浇铸工艺参数进行了一般性的评价。 相似文献
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建立了一种用于单体化合物嗅香相似性评价的方法,并借助该方法对苯乙醇相关化合物与笨乙醇嗅香的相似性进行了定性定量评价,所获得的评价结果与化合物结构的特征存在明显的相关性.该方法可作为香味物质定量构-香关系研究中香味物质定量评价的方法,用于化合物嗅香定量数据的获取. 相似文献
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Yu Yi Zehua Zhou Zehua Wang Shaoqun Jiang Weidong Huang 《Metallurgical and Materials Transactions B》2012,43(5):1173-1176
On the basis of early works, Si-steel strips with 3.0?wt pct Si content were prepared by twin-roll continuous casting (TRCC); posttreatment of double cold-rolling with different annealing temperature was completed, and accordingly, optimum parameters were ascertained. The microstructure and magnetic properties of the strips before and after posttreatment were investigated. The results indicated that Si steel strips could be successfully prepared by TRCC, and the best annealing conditions for posttreatment were 1223?K (950?°C)?×?3?minutes in the Ar. Si steel strips exhibited the best magnetic properties after optimum posttreatment: core loss of 4.31?W/Kg and magnetic induction intensity of 1.69T. Moreover, proper posttreatment resulted in ordering of Fe3Si of the Si steel strips, and this ordering was a key factor on improvement of magnetic properties. 相似文献
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攀钢1#连退线是由原1#镀锌线(改良的森吉米尔法)改建而成,主要是用于生产开发连退板以及无取向电工钢等新产品。电工钢是一种重要的金属功能性材料,铁损、磁感、叠片系数等是其重要的特性参数。针对低牌号的无取向电工钢,结合攀钢冷轧1#连退线设备的特殊性研究影响电工钢的磁性能指标的因素。 相似文献
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Grain-oriented electrical steel is mainly used as the core material in electrical transformers, and its magnetic properties are closely related to the sharpness of Goss texture formed by secondary recrystallisation during high-temperature annealing. However, the mechanisms of abnormal Goss grain growth are still disputed in the literature. In this paper, grain-oriented silicon steel strips with AlN as main inhibitor were produced by thin slab casting and rolling process, and the evolution of microstructure and texture during high-temperature annealing was investigated. Moreover, the mechanisms of secondary recrystallisation were further discussed. The results show that secondary recrystallisation is actually a multi-stage process, and different mechanisms are at work at different stages. Coincident site lattice grain boundaries play an important role at the early stage of secondary recrystallisation, however, the role of high-energy grain boundaries and solid-state wetting should be more important at the later stage of secondary recrystallisation. 相似文献
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《钢铁冶炼》2013,40(6):477-482
AbstractGrain oriented electrical steel coils are batch annealed at 1200°C to develop the magnetic properties of the strip. Temperature gradients are known to exist within the coils, which can affect the three important reactions occurring in the steel during annealing. These gradients result from the anisotropic conduction properties of the coil and the application of furnace heat. Heat is applied from the furnace to the coil in the radial direction. Studies of the conduction properties of an electrical steel coil have shown that the radial coefficient is ~20% of the axial coefficient. Computational fluid dynamics was employed to simulate a furnace redesign, comprising increased axial heating and a larger coil size. The results show that the annealing cycle time may be shortened and annealing conditions simultaneously improved. The difference between process requirements and process performance can be significantly narrowed by use of the redesigned furnace. 相似文献
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近年来,在节能减排背景之下,国内外众多研究者对无取向电工钢磁性能的提升做了大量研究。为了探索无取向电工钢磁性能提升的方法,对锡或锑对无取向电工钢磁性能的作用机制(晶粒尺寸和晶体织构的控制)进行分析。基于该作用机制,介绍锡或锑的添加对无取向电工钢磁性能的影响。经研究发现,适量的锡或锑在晶界偏聚,不会阻碍晶界的移动并且致使晶粒尺寸降低;与此同时,锡或锑在晶界偏聚不仅抑制{111}织构在原始晶界处形核及生长,还降低(100)晶粒表面能,促进(100)晶粒生长。因此,适量添加锡或锑,可使无取向电工钢铁损下降、磁感提升。最后结合生产工艺,建议无取向电工钢的研究方向应为稀土含量对高牌号无取向硅钢夹杂物尺寸和数量分布的影响,锡或锑的添加量和常化工艺参数(常化时间、常化温度)对常化晶粒尺寸的影响。 相似文献
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