共查询到20条相似文献,搜索用时 15 毫秒
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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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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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Compensation Model For Shape Measuring of Cold Strip Rolling 总被引:4,自引:0,他引:4
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
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JIA Chun-yu LIU Hong-min 《钢铁研究学报(英文版)》2006,13(1):31-35
Shape control systemis a complicated systemwith the characteristics of typical multi-variant ,ti me delay ,strong coupling and nonlinearity .Due tothe difficulty to establish precise analytic model andthe inaccuracies of classical and modern controlmethods based on empirical models ,it is more suit-able to adopt intelligent control strategy in shapecontrol system[1 -7]. Therefore , a parameter self-ad-justingfuzzycontroller was designed based onthe El mandynamic recursion network predication m… 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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建立了薄带冷轧机的板形自动控制目标设定模型,它以轧后带钢的在线屈曲和后屈曲理论为板形生成的力学判据,以实测带钢温度横向分布为补偿,分别在203OCVC冷连轧机和1250HC冷轧机上运行成功。生产实绩证明其控制效果优于原用的引进模型,板形质量显著提高。 相似文献
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Shapemathematicalmodelformeasuringandcontrolling ,analyticaltheoryforshapestiffnessandthelawofcoordinationcontrolforshapeandgaugearecalledShapeMeterMethod (SMM ) .Thestudyofshapetheoryandtechnologyhasbecomethekeyissueinrollingtechnologyinrecent 4 0 years .T… 相似文献
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为了准确预测小样本、非线性特点的排土场边坡位移,提出了一种基于经验模态分解法、三次指数平滑法和粒子群优化极限学习机的EEMD-HW-PSO-ELM边坡位移组合预测模型。以伊敏露天矿排土场GPS位移监测数据为例,验证该模型的有效性。研究结果表明:EEMD模型分解后的边坡位移时间序列包括4个IMF分量和1个余量,将分解后的数据重构为趋势项和波动项,物理意义明确。分别选择三次指数平滑法和粒子群优化极限学习机预测趋势项和波动项位移,将分项预测结果的等权叠加值作为最终预测结果,预测值的平均相对误差为0.38%,均方根误差为1.15。选择了BP模型和Elman模型进行对比预测,结果表明组合预测模型的预测效果较好,能够为边坡安全管理提供理论依据。 相似文献
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In specific condition, when wrapping angle of cold rolling strip covering surface of shape detecting roll dynamically changes, online radial compression of the shape detecting roll is changed too, and it seriously affects online shape detecting precision of cold strip. Based on the latest intelligent shape meter developed by Yanshan University, using PSO-BP neural network and actual working condition datum, the cold strip online dynamic wrapping angle compensation model is established, and successfully applied in 1250 mm 6-high cold mill, remarkable results are achieved. The error between calculated values and measured values of total tensions is within 3%. 相似文献
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Shape setup (SSU) system is the core technology for hot strip mill (HSM). A precise SSU system was used to improve the strip quality for HSM. The function of SSU, setup, and feedback was introduced. The main mathematical models of roll gap profile and longitudinal strain difference are set up. Strip profile allocation strategy was researched according to the SSU system of a domestic 1 700 mm HSM. The SSU system was put into practical use and the measurement results showed that strip flatness variation and strip profile variation could be controlled in target scope. 相似文献
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以前馈式BP神经网络为基础,收集挑选轧机生产过程中对板形有影响的轧制因素作为模型输入参数,板凸度作为输出参数,利用SQL、Matlab及数据提取软件进行数据收集存储、管理、运算,建立神经网络热轧板凸度预报模型。通过大量样本训练,该系统已初步具备了预测板形质量的能力,且误差较小。系统应用后,提高了板形质量,降低了生产成本。 相似文献