共查询到19条相似文献,搜索用时 125 毫秒
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冷连轧的主要工艺参数为轧制力和前滑,而轧制力和前滑设定计算的精度取决于轧件的变形抗力和摩擦因数的精度,变形程度是影响变形抗力的一个重要因素,将所选变形抗力回归模型经过取对数等变换成线性函数,以鞍钢生产的St14钢为例,利用现场实际数据通过最小二乘来逐次拟合变形抗力回归模型中的系数。在同一轧制条件下,摩擦因数用3种不同的获得方法,其中前2种是由实测前滑值反算得到的,以使所得模型能够很好地与实际生产的数据相吻合。用回归出的3种不同变形抗力模型,分别带入轧制力迭代公式进行计算,所得轧制力基本与实测轧制力相符,其中由斯通公式拟合出的变形抗力回归模型计算出的轧制力平均误差很小,由此可以选出最优的变形抗力模型来应用于实际生产中轧制力和前滑的预设定。 相似文献
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在冷轧过程中,摩擦力对轧制过程的稳定有至关重要的作用。介绍的摩擦因数计算方法是根据实际经验总结得到的,它可以综合轧制过程影响摩擦因数的众多因素,通过模型计算的方法将经验转化为控制技术,并且提供了简单有效的调整手段,便于技术人员在实际的过程中进行快速调整,保证生产状态的稳定。 相似文献
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摩擦因数模型是冷轧的核心工艺模型之一,目前对其进行的大量研究多是在试验环境下进行的。基于经典摩擦因数模型的工艺原理,综合考虑了轧辊粗糙度、轧制速度等关键因素的影响,结合生产控制的实际情况及控制模型的整体设计,提出了适用的摩擦因数计算模型,进而简要介绍了摩擦因数模型关键参数的调试方式,并提出了一套间接评价模型精度的方法。通过现场测试和长期实际应用证明了模型的控制效果优异。 相似文献
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采用混合摩擦模型预报冷轧薄板轧制力 总被引:16,自引:2,他引:14
作采用包括粘着摩擦和滑动摩擦在内的混合摩擦模型,研究了冷轧薄板轧制力预报问题,建立了轧制力预报新模型。用新模型对实际生产数据进行了计算,并将理论预报值与实测值和MDStone公式计算结果进行对比,验证了新模型的正确性。 相似文献
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为研究异步轧制搓轧区的几何参数,根据力平衡方程和秒流量相等的原则,建立了无张力条件下不同变形区组态的中性角和搓轧区比例计算模型,并按中性角取值对不同变形区组态进行划分。在三区组态的条件下,分析讨论了异速比、摩擦因数、轧件厚度和压下率对搓轧区比例的影响。搓轧区比例是决定异步轧制在降低轧制力、最小可轧厚度和得到细化组织工艺条件的重要参数,搓轧区比例计算模型的建立,为异步轧制工艺参数的设定提供了理论依据。中性角和搓轧区比例计算式经过试验验证,与实际值吻合。 相似文献
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轧制压力数学模型及有关公式分析对比 总被引:1,自引:0,他引:1
本文分析了冷轧压力公式的共同性问题。陈家民轧制力公式的推导过程中,省略了塑性方程中由摩擦引起的剪力,因而轧制力计算值接近实际。本文以此式为基础建立轧制力数学模型。对八个轧制力公式用μl/(?)及ε统一了参数。因而它们有着相似的函数式n=φ(μl/(?),ε)。并得到以下效果: 1)减少了轧制力公式中参数的数量,缩短了计算和在线控制的程序。 2)实现了公式之间的定量对比。同时可以方便地进行有关公式间的选择与评定。 3)有四个公式变换成线性方程,而另外四个公式仍是非线性方程。在非线性公式之间,复杂公式可用简单公式来代替。 相似文献
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In the process of steel tube production, continuous tube rolling is the foremost forming procedure and the critical step that decides the dimension precision and the surface quality. In the actual production of the 140 mm full floating mandrel mill in Steel Tube Branch in Baosteel, steel T91 was chosen to be the typical sample, self made rolling force transducer and mandrel velocity testing equipment were used, and a series of comprehensive tests on rolling parameters including the rolling force and mandrel velocity were carried out. After the experiment, the friction state between rolling tube and mandrel was analyzed. The friction coefficient was calculated and the values of 0033-0074 in each mill were obtained. The friction coefficient increases obviously along the rolling direction. 相似文献
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Jian-zhao CAO De-wen ZHAO Shun-hu ZHANG Wen PENG Shu-zongCHEN Dian-hua ZHANG- 《钢铁研究学报(英文版)》2014,21(3):295-299
In order to analyze the hot tandem roiling force, a new logarithmic velocity field is proposed. Using the field and linear EA (equal area) yield criterion, the plastic deformation power for plate rolling is analyzed, and the friction power is obtained based on the co-line vector inner product method. Then analytical solution of plate rolling power functional is obtained. Finally, by minimizing the power functional, the rolling torce and torque are received. Compared with those measured ones in hot tandem rolling on-line, the calculated rolling forces are in good agreement with the actual measured ones since the maximum error is less than 12~. Moreover, the effects of various rolling conditions such as thickness reduction, friction factor and shape factor, upon separating force, location of neutral an- gle, and stress state coefficient are discussed systematically. 相似文献
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In cold strip rolling control system, rolling force and forward slip are the prerequisites for the model setting calculation, and the deformation resistance and friction coefficient are the main parameters that affect their predictions. A new method based on objective function is first proposed in this paper to improve the calculation accuracy of rolling force and forward slip, and the deformation resistance and friction coefficient are taken as optimisation variables. Using the multi-population co-evolutionary algorithm to solve the objective function, the required rolling force and forward slip are obtained. The pre-set values of rolling force and roller line speed are compared with the actual measured ones in a 1450?mm five-stand tandem cold mill and other researcher’s method. Results show that the calculated values are in fair agreements with the on-line measured ones, and the thickness and flatness accuracy of the final product are improved. 相似文献
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冷连轧高速轧制过程中摩擦因数机理模型的研究 总被引:2,自引:0,他引:2
在现场试验与理论分析的基础上,针对现有摩擦模型对冷连轧高速轧制过程中摩擦因数的预报精度不高、通用性不强等问题,首先对润滑油膜厚度计算模型与摩擦因数返算方法进行了推导,然后定量研究了辊缝中润滑油膜厚度与摩擦因数之间的关系,最终建立起一套适合冷连轧高速轧制的摩擦因数机理模型,并将其应用于宝钢冷轧薄板厂1220五机架冷连轧机与宝钢冷轧厂2030五机架冷连轧机的生产实践.应用结果表明:提高了轧制的稳定性与带材的控制精度,减小了相关模型的自学习与自适应系数波动,取得了良好的使用效果. 相似文献
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《钢铁研究学报(英文版)》2016,(12):1268-1276
A mathematical model of friction coefficient was proposed for the roll force calculation of hot-rolled strips. The online numerical solving method of the roll force calculation formula based on the proposed friction model was developed and illustrated by the practical calculation case.Then,the friction coefficient during hot strip rolling was estimated from the measured roll force by force model inversion.And then,the expression of friction model was pro-posed by analyzing the calculation process of stress state coefficient,and the model parameters were determined by the shared parameter multi-model nonlinear optimization method.Finally,the industrial experiments demonstrated the feasibility and effectiveness of the related models.The accuracy of the new roll force model based on the built friction model was much higher than that of the traditional Sims model,and it could be applied in the online hot roll-ing process control. 相似文献