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通过分析棒材生产粗中轧无孔型轧制中轧出口料型头部肥头产生的原因,优化滑动导卫耐磨板间隙、1#剪剪切、轧件张力判断与调整、加热钢坯出炉温度的控制和中轧10架孔型优化,解决了中轧出口料型头部肥头的问题,实现了粗中轧无孔型轧制生产稳定. 相似文献
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由于在2 050 mm热连轧机中只有粗轧机的立辊具有宽度压下的功能,粗轧出口宽度偏差在精轧及卷取机组基本无法进行弥补,因此粗轧宽度控制精度直接决定了精轧及卷取出口宽度精度,优化粗轧宽度控制模型以减少粗轧宽度偏差,是提高宽度控制水平的重要手段。粗轧R2出口新增测宽仪为模型的优化提供了基本条件,可以实测轧件在R2出口的宽度偏差,并基于实测数据进行模型的学习与后续轧机的设定修正,有利于宽度控制精度的提高。 相似文献
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分析了粗轧出口温度对低碳Nb-Ti微合金化600 MPa级汽车大梁钢性能的影响.研究表明:在相同成分体系下,粗轧出口温度对薄规格(3.8 mm)和厚规格(7.8 mm)的强度影响趋势一致.粗轧出口温度在1055~1075℃,随着粗轧出口温度升高强度降低;粗轧出口温度低于1055℃和高于1115℃时,粗轧温度越高强度越高... 相似文献
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针对HW150mm×150mm极限规格H型钢产品偏心问题,采用有限元方法对粗轧阶段孔型系统进行三维热力耦合数值模拟。基于模拟结果分析金属流动、塑性应变及温度变化,以此为基础,根据变形特点及各孔型轧件尺寸分析偏心产生的原因,优化孔型并进行验证,最后进行现场实践,排除缺陷。结果表明,有限元模拟有助于分析轧制过程中的金属成形,尤其对于型钢轧制过程中的变形规律及缺陷分析具有较高的参考价值和指导意义。 相似文献
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《Baosteel Technical Research》2010,4(4):54-58
Based on the characteristics of ferritic SUS430 heating and deformation,and combined with the features of the 1780 mm hot-rolling mill,a roughing model was introduced in two aspects:optimizing the rough rolling passes and improving the width control precision.Through reducing the rough rolling passes,the rough rolling time can be shortened,the precision rolling startup temperature can be raised and the yield of the hot-rolled products can be increased.Moreover,on the premise that the slab width fluctuation was great,the precision of the width control can be improved through optimizing the parameters of the hot-rolling width control model.The result shows that the optimization and perfection of the original rolling process of the stainless steel 430 series further improved its capacity and product quality. 相似文献
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带高压水除鳞换热的带钢粗轧过程温度场数值模拟 总被引:3,自引:1,他引:2
热带钢在轧制前通常需用高压水去除氧化铁皮。随着高压水对带钢表面冲击强度的增加,除鳞效果明显增强,带钢的温度也显著降低。影响带钢温度变化的因素复杂多变,其中尤以高压水的影响较显著,因此研究带钢在高压水除鳞过程中的温度场分布,对于了解带钢粗轧过程中的温度变化、合理制定后续精轧工艺非常必要。笔者将有限元数值解法与实验结果相结合,研究了高压水冲击强度与带钢换热系数之间的对应关系,得出了换热系数计算模型。将该模型应用于宝山钢铁集团公司2050mm热带钢粗轧机组进行模拟计算。结果表明模拟值与现场实测值吻合良好。 相似文献
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济钢二小型围绕成品轧机提速,采取改进轧机径向、轴向调整结构,改进关键部件材质,优化粗、中、精轧节奏匹配等措施,在主机列不做任何改变的情况下,将成品线速度由8.5m/s提高到10.5m/s,通过轧机扩径的途径,达到了提高横列式轧机产品产量和质量的目的。 相似文献
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1580热连轧机减少轧件温降措施的研究 总被引:1,自引:1,他引:0
宝钢1580热连轧机采取了保温罩、较厚的粗轧出口中间坯、先进的粗轧道次负荷分配方式等措施,以减少轧制过程温降。其温度计算数学模型计算精度较高。本文介绍了该轧机的温度数学模型,分析轧制过程中的轧件温降,较详细地介绍其减少轧件温降的措施。 相似文献
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《Baosteel Technical Research》2010,(Z1):101
Furnace area is regarded as looper between casting and hot rolling,which is very important for material flow balance and production organization as well as temperature regulation etc.In particular,when dealing with energy saving and emission reduction and heating quality improving,pre_heating furnace is paid more attention.The radical target for preheating furnace is to transfer heating energy at the least cost. As we know,the preheating furnace is a dissipation system to obey conservation of energy law,that is to say that input energy always equals to output energy,in the meantime,the whole energy consuming is not reversible.Therefore increasing the efficiency of using energy is uppermost.In this paper,heating transfer efficiency is analysed and mathematical expression is given based on conservation of energy law.Typical optimal methods to improve preheating furnace transfer efficiency coming from foreign factories are presented.According to these methods,every furnace zone temperatures as control variable,target discharging temperature and temperature difference in slab thickness and the temperature between neighbouring zones as well as zone temporary temperature as restrictions,minimal energy consuming as optimizing target.Baosteel preheating furnace model structure and the complicated mapping relation of control parameter set and state set and aim set are presented.Important basic models in the preheating furnace model system are analysed including temperature tracking model and temperature forecasting model and discharging pacing model and slab heating curve.First slab temperature model structure and its peripheric parameter are introduced;second two pacing models are given including timing pacing mode using fixed discharging interval and mill pacing control mode using mill rolling pacing while Baosteel pacing forecasting model using long term and short term forecasting mode) is given;third a heating curve mathematical model considering heating quality and rolling pace and energy consuming is presented;in the end summary is done and the future way is lighted.Baosteel heating model including slab and billet and steel ingot have been developed,the actual applications show a good effect.The future woks include working procedure saving energy and system saving energy considering " Oder and rule" to achieve system harmony and rhythmization.Baosteel Blooming furnaces scheduling system is very useful for smooth production and saving energy. 相似文献