一种高精度板带轧机的设想

轧辊和轧机的弹性变形是影响板带轧制时工作辊缝和平直度及厚度精度的关键因素;轧辊两端设置压下螺丝是产生思辊弹性弯曲的根源,本文在理论分析的基础上提出了将压下螺丝从轧辊两端移至辊身中部的高刚度,高精度板带轧机的设想,并对其主要特点进行了探讨,。     

六辊轧机辊系弹性变形研究

在板带轧制中,轧机辊系弹性变形是影响板形质量的重要因素.以弹性基础梁理论为基础,将辊间接触及工作辊与轧件间的接触采用弹簧模拟其力学模型,从而获得六辊冷轧机辊系弹性变形的解析数学模型;提出了一种将轧件断面形状分布与轧制压力分布耦合的迭代计算轧机辊系弹性变形和轧件最终断面形状的方法,利用MSC. MENTAT/MARC软件建立了六辊轧机辊系弹性变形的非线性接触有限元模型.计算结果表明:采用解析法、有限元法计算出的轧件断面形状与现场实测出的轧件断面形状及板带凸度数值相近,这说明研究方法和模型的有效性.     

四辊板带轧机的轴向动力学特征模拟

研究了四辊板带轧机轧辊交叉情况下的轴向动力学特征，建立了辊系轴向振动的合理的动力学模型，基于摩擦学的预位移理论，给出了工作辊与支承辊之间，以及工作辊与轧件之间的轴向刚度的定义。同时，分析了辊系的轴向阻尼特性，确定了轴向阻尼系数的量级。动载荷放大系数的研究为讨论轴向力对轧辊轴承的影响同时提供了合理的依据。     

快速高精度电动辊缝控制技术的研究与应用

采用DGMI系列直线式压下螺丝位移测量仪可以直接测量轧机的电动辊缝,为高精度的电动辊缝控制（EGC）提供了依据.通过对位置控制特征曲线的研究,分别给出了提高定位精度和定位速度的参数调整方法.该技术在河北敬业集团中厚板轧机上取得了良好的应用效果.     

辩证认识热裂纹 降低轧辊损耗（一）

热裂纹是一种最常见的轧辊缺陷，不论是板带轧机还是其它形式的轧机轧辊，均不可能避免出现热裂纹．对于产生的热裂纹如不及时处理，可能会引起一些更严重的缺陷或事故，如剥落、断辊等，造成轧辊被迫提前下机甚至报废．如果及时发现并加以处理，不但可以避免一些事故的发生，而且还能发挥其积极的作用，因为在粗轧机架上适当数量、大小的裂纹可以改善咬人条件、避免打滑。     

大型板带轧机多列轴承均载特性研究

利用三维接触问题的边界元法对大型板带轧机多列轴承载荷分布进行了全面研究，发现导致该轴承破坏的主要原因是多列轴承严重偏载。通过重载机构学理论分析，发现原轧机的轧辊辊系约束机构构不合理。针对宝钢2050热轧精轧机的具体结构，研制出轴承自适应均载装置。该装置大大缓解了多列轴承的偏载，可以显提高轧机轴承寿命。理论分析和现场试验结果充分验证了自适应均载装置的正确性。     

CVC四辊轧机板形控制解析解耦模型

ＣＶＣ四辊轧机工作辊辊抽动与工作辊弯经作用关系的解耦。对实现理想的板带平地度控制是十分重要的,通过对辊缝形状的解析分析,建立了一个明确表示工作辊一动力 弯辊作用的解析解耦模型,可用于ＣＶＣ四辊轧机板形成线控制。     

1150初轧机压下螺丝回松的研究

阐述了１１５０初轧机压下螺丝回松对其使用寿命的影响，给出了回松实测的基本原理及方案，并根据实测结果分析研究了回松的原因及规律。     

快速超薄铸轧机铸轧辊变形热力耦合模型

快速超薄铸轧机铸轧辊的辊芯与辊套为2种不同材质配合而成的复合体，存在不连续的结合面，辊芯内有几何结构复杂的内冷水槽而非单一实心体，周向温差较大，其温度场为非对称三维温度场，工作在多种物理场（热、力）下，作者运用热弹性力学理论，建立热弹耦合方程并求解，并结合接触压力（轧制力分布）模型，确定了铸轧辊温度场边界条件，得到了超薄铸轧机铸轧辊变形的计算模型。     

影响板带材轧制头部翘曲因素的正交实验研究

用正交实验方法,对影响板带材轧制头部翘曲的因素进行了研究.因素有上下轧辊直径比、压下率、导入角和轧辊转速.正交实验是L25(45),研究表明:辊径比对头部翘曲影响最大,且影响趋势变化复杂;当板较厚时,辊转速的影响也较大,导入角的影响最小;当板较薄时,导入角的影响较显著,辊转速的影响最小;来料板厚不同,各种因素的影响趋势变化呈现了不同的规律,来料板厚也是影响头部翘曲的一个主要因素.优化了实验轧机控制头部翘曲的工艺参数.     

Preset model of bending force for 6-high reversing cold rolling mill based on genetic algorithm

The hydraulic roll-bending device was studied, which was widely used in modern cold rolling mills to regulate the strip flatness. The loaded roll gap crown mathematic model and the strip crown mathematic model of the reversing cold rolling process were established, and the deformation model of roll stack system of the 6-high 1 250 mm high crown (HC) reversing cold rolling mill was built by slit beam method. The simulation results show that, the quadratic component of strip crown decreases nearly linearly with the increase of the work roll bending force, when the shifting value of intermediate roll is determined by the rolling process. From the first pass to the fifth pass of reversing rolling process, the crown controllability of bending force is gradually weakened. Base on analyzing the relationship among the main factors associated with roll-bending force in reversing multi-pass rolling, such as strip width and rolling force, a preset mathematic model of bending force is developed by genetic algorithm. The simulation data demonstrate that the relative deviation of flatness criterions in each rolling pass is improved significantly and the mean relative deviation of all five passes is decreased from 25.1% to 1.7%. The model can keep good shape in multi-pass reversing cold rolling process with the high prediction accuracy and can be used to guide the production process.     

Improved model to solve influence coefficients of work roll deflection

According to the concept of virtual bending force, a rational explanation for SHOHET’s model was presented. Considering the deformation characters of the work rolls in four-high mill, the deformation model of the work roll was regarded as a cantilever beam and new influence coefficients were deduced. The effect of the bending force was taken into account independently. Therefore, the contribution to work roll deflection caused by rolling load, rolling pressure between rolls and bending force can be got from the new formulas. To validate the accuracy of the formulas, the results obtained from the new formulas were compared with those from SHOHET’s formulas. It is found that they highly coincide, which illustrates that the formulas are reliable.     

Improvement on strip flatness of cold temper mills by modifying roll contour shape

A study on roll gap profile (strip profile) control was accomplished in a 1700 mm single-stand temper mill. Some critical problems such as the deviation of work roll contour caused by grinding and wear, the effectiveness of work roll bending were discussed. Using a finite element model, the effects of roll contours (ground and wear) on strip profile were investigated. The roll bending effect on strip thickness was also analyzed. It is pointed out that there are some special features of flatness control in the temper mill: during temper rolling, roll deformation is slight due to small rolling load, and the loaded roll gap profile mainly depends on work roll contour, while the backup roll has a little effect on gap crown; the effect of bending force on gauge can not be ignored due to the coupling between flatness control and gauge control. A new roll contour arrangement adaptable to the mill was presented and has been put into practical production. The application of the new set of rolls showed some good results: larger crown control range of work roll bender, higher rolling stability, better strip profile and flatness quality.     

BEM Simulation on Elastic Deformation of Oil Film Bearing in Low Speed and Heavy Load Rolling Mill

1 Introduction Oil-filmbearing of rolling mill belongs to thick fil mlubrication. The current regularity of partial load e-nough certificates that partial load behaviors is the major causes that result in short-life and abnormal failure .Therefore ,howto decrease and eli minate partial load behaviors has become ani mportant wayto prolong bearinglife ,the exact elastic deformation of low-speed and heavy-load bearing under partial load helps tofurther analyzeits lubrication mechanism.Thelubricat…     

14辊轧机辊系变形的有限元分析

针对现场应用的14辊轧机,利用三维有限元软件MSC.MARC建立三维辊系弹性变形有限元模型,求解三维辊系复杂变形,分析第一中间辊抽动和中间辊凸度对承载辊缝的影响。研究得出第一中间辊抽动量在0-50mm时,带材边部厚度的调节范围;中间辊凸度与轧后板凸度呈线性关系,即中间辊凸度越大,辊系的横向刚度也越大。     

全浮芯棒二辊孔型中轧管金属变形行为研究

为分析连轧荒管管壁收缩的原因,借助有限元模拟软件MSC.Super Form,对宝钢Φ140 mm全浮芯棒连轧管机组Φ119 mm主孔型系钢管的单机架轧制过程进行数值模拟仿真,研究轧制过程中不同工艺参数对金属变形行为的影响,分析产生壁厚收缩缺陷的倾向性。结果表明：孔型顶部的壁厚压下量一定时,孔型开口处壁厚随空减坯径壁比的增大由＂增壁＂变为＂减壁＂,并且存在一临界径壁比;径壁比一定时,孔型开口处壁厚变化随压下量的增大由＂增壁＂变为＂减壁＂,并存在临界压下量;径壁比、压下量均一定时,单机架轧制高钢级时孔型开口处壁厚值相对较大。     

六辊CVC轧机轧辊弯曲和压扁变形的有限元分析

采用非线性弹塑性有限元法,利用大型非线性有限元软件MSC.Marc建立了六辊CVC轧机轧制过程三维有限元仿真模型。模型将辊系弹性变形与轧件弹塑性变形耦合在一起,进行统一建模与分析。运用该模型分别改变工作辊弯辊力、中间辊弯辊力、中间辊横移量进行有限元模拟,得到了工作辊弯辊、中间辊弯辊、中间辊横移对六辊CVC轧机轧辊弯曲和压扁变形的影响规律。所建模型与分析结果可为六辊CVC轧机的板形控制研究提供理论数据与参考依据。     

Gauge-meter model building based on the effect of elastic deformation of rolls in a plate mill

The calculation error of the gauge-meter model will affect the gap setting precision and the self-learn precision of rolling force. The precision of the gauge-meter model is strongly influenced by plate width, working roll radius, backup roll radius, working roll crown, backup roll crown, and rolling force. The influence rules are hard to get by measuring. Taking a conventional 4-h plate mill as the research subject, these influences were transferred into the calculation of roll deflection and flattening deformation. To calculate these deformations, the theory of the influence function method was adopted. By modifying the traditional gauge-meter model, a novel model of the effect of roll elastic deformation on the gap setting was built by data fitting. By this model, it was convenient to analyze the variation caused by the rolling condition. Combining the elastic deformation model of rolls with the kiss-rolls method, a gauge-meter model was put forward for plate thickness prediction. The prediction precision of thickness was greatly improved by the new gauge-meter model.     

UC轧机中间辊非对称弯辊改善辊间压力分布

为了改善UC轧机辊间压力不均匀分布问题,采用中间辊非对称弯辊系统替代原有对称弯辊系统.应用影响函数法计算辊系变形,同时考虑辊缝中金属横向流动对带钢出口张力横向分布的影响,通过迭代方法计算出中间辊两端施加不同弯辊力后的辊间压力分布、出口厚度横向分布与出口张力横向分布.理论分析和实际应用结果表明,中间辊非对称弯辊可以改善辊间压力分布不均,降低轧辊磨损和减少轧辊辊面剥落,且不会影响成品带钢的厚度和板形.     

冷轧厂磨辊间的设备布置及其半自动化实现

本文介绍了冷轧厂磨辊间的功能、对轧辊的处理过程。根据冷轧厂的实际情况,提出将磨辊冷区间划分为自动化区和半自动化区,结合冷轧磨辊间设备的特点,介绍了设备在各区间的布置情况。同时,介绍了磨辊间的管理系统的功能和数据传输过程,从而突出磨辊间半自动化的特点及优势。