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分析了解析法与简化方法的缺点,采用有限元法建立轧辊热变形计算模型.针对轧制过程中轧辊热变形计算数据特点,将计算任务分为负责静态数据准备的预计算和负责动态数据准备与热变形求解的更新计算,换辊时进行预计算,计算任意时刻的热变形时只需进行更新计算,计算量远小于标准有限元程序.根据特殊处理的计算流程,编写了基于轴对称有限元法的轧辊热变形程序,其计算结果与ANSYS结果一致,精度均高于简化方法约30%.自编轧辊热膨胀有限元程序计算精度高,耗时少,满足在线热膨胀预报要求. 相似文献
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While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction model have been published. The aim of this work is to evaluate and compare two prediction models with measured roll wear. The first prediction model, model 1, developed for a plate mill, was modified to use in strip rolling process. The second prediction model, model 2, is a simplified on‐line model. Data of two hot strip mills were used to investigate the influence of different rolling schedules. The rolls and strip properties were described and the rolling conditions were detailed. The influence of hot rolling factors, such as strip strength, roll grades, rolling temperature, rolling force, reduction and contact length, were also studied. When rolling with different work roll materials and strip grades, the modified prediction model has better prediction accuracy than the simplified model. The accuracy of both models becomes better at higher roll wear > 150 μm. HSS work rolls were confirmed to exhibit improvement of roll wear in comparison with HiCr rolls, the wear resistance was 3 to 4 times better. The influence of strip grade on roll wear was shown to be significant, with higher accuracy of the regression statistics for rolling with similar strip grades and lower regressed accuracy for rolling with mixed strip grades. The roll wear was evaluated at the centre of the barrel. 相似文献
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It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the rolling force. To control the strip shape effectively, it is important to understand the relationship between the behavior of the shape actuator and the variation of the strip shape. A numerical model based on the contact element method was proposed for the prediction of strip shape. In this numerical model, the relationships between the actuating forces, the roll deflections, the thickness profiles of the entry and exit sides, and the strip shape were considered. The proposed numerical model for strip shape prediction was evaluated by computer simulation and experiment with respect to various AS-U roll and first intermediate roll positions. 相似文献
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In the direct fired furnace of a continuous annealing line,seal rolls are susceptible to deformation that leads to surface defects of steel strips. According to failure analysis,the reasons include improper structural design and heat imbalance. An improved design has been proposed to reduce stress concentration and thermal radiation. A heat transfer model has been employed to determine the proper water flow rate for roll cooling. Industrial application proves that seal rolls with the new design has less deformation and longer service life. 相似文献
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介绍新钢热轧1 580 mm生产线在板形质量上存在的问题。通过优化轧辊辊形、轧辊磨损及模型参数优化,使产品板形质量得到较大改善。 相似文献
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The strip flatness and crown control model is the foundation of automatic strip shape control. In this paper, considering the metal transverse flows and the inter stand second deformation, the trip flatness and crown control model has been developed , which can be applied to CVC mills and PC mills as well as normal four-high mills. The strip flatness and crown control model has a high precision, and has been successfully applied to the automatic strip shape control system reconstruction of Tangshan Ganglu 1250mm hot strip plant. 相似文献
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Quantitative level evaluation of cold-rolled strip was significant for the shape control and the product structure optimization. Based on the probability statistics method and the shape pattern recognition method, the shape evaluation model of cold-rolled strip was established to evaluate real-time shape of the online strip. The model was embedded in the shape control system, and the online strip shape state was real-time observed whether to meet the technical indicators, so the shape level could be identified and evaluated. Based on the shape evaluation indicators, the shape component could be well controlled to improve the shape hit rate and the control stability, so that the rolled strip shape could meet the technical requirements. At a 1050 cold strip mill, the shape data of the scene typical specifications strip were online collected and real-time evaluated, and the hit of macro shape in less than 8 I was 68.44%, indicating that the mill shape control had considerable room for improvement, as well as the evaluation method was feasible and practical for quantitative evaluation of the strip shape. So the new evaluation model has important guiding significance to increase value-added and reduce product quality objection. 相似文献
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由于PC热连轧机轧辊成对交叉,因而在变形区接触表面产生随交叉角变化的轴向力。作者分析了这一轴向力的产生机理,根据具体条件确定了8种不同轴向分力矢量图,并采用差分单元叠加方法进行计算,得出了精轧机组6个机架的轴向力及其变化规律。计算结果与实验值吻合较好,从而对PC热连轧机承受轴向力载荷的轴承设计及维护提供了依据。 相似文献
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The shape meter is interfered by some unavoidable factors in the process of cold strip shape measuring, so the measuring results can not reflect the ture shape and the measuring precision is low. In this paper, The influence of the measuring results is detailed analysed, which is influenced by the measuring error of strip edges、the transverse temperature difference of strip、the shape detection roller deflection and the shape of strip coil, The corresponding compensation models are established. And a cold strip mill is calculated as an example, gaines some disciplinarian cognitions. 相似文献
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根据轧制理论中的体积不变原理和平直度的基本定义,考虑来料板形的遗传影响,推导出了以入口和出口带钢相对凸度差表示的带钢平直度模型.该模型在连轧机参数优化设计和辊型配置优化设计系统中均得到应用,效果良好. 相似文献