钢轨万能精轧过程的三维弹塑性有限元模拟

借助有限元分析软件MSC.Marc,采用三维热-机耦合弹塑性有限元模型,对钢轨万能精轧过程进行模拟分析。以UR-EF-UF三机架连轧过程为研究对象,建立变形过程优化模型。将轧件尺寸模拟结果与实验结果进行比较,两者吻合较好,验证了模型的准确性。对轧件变形过程、轧制接触状态、应力应变分布以及速度变化等模拟结果进行了讨论分析,揭示了万能轧机各道次的加工特点和轧件在连轧变形过程的变形规律。     

60 kg/m钢轨万能轧制过程有限元模拟研究

以鞍钢大型厂60 kg/m钢轨轧制过程为研究对象,通过MSC.Marc软件,建立三维弹塑性热-机耦合有限元模型,模拟分析了万能轧机轧制生产过程中轧件的变形和受力情况。模拟结果与实际结果吻合较好,应用所建立的有限元模型对万能轧制机组轧制过程进行模拟,获得了轧制过程轧件变形、受力以及速度等参数的分布情况。     

Analysis of Metal Forming in Two-Roll Cross Wedge Rolling Process Using Finite Element Method

A simulation model for two-roll cross wedge rolling (CWR) was presented by using three-dimensional rigid-plastic finite element method (FEM).The whole forming process of CWR,including knifing zone,guiding zone,stretching zone,and sizing zone,was simulated using the model in which dynamic adaptive remeshing technology for tetrahedral solid elements was used to fix element distortion.Based on the simulation results,the distributions of metal flow field,strain field,and damage field,and the geometry of the workpiece's end were analyzed.These results could provide theoretical guidance for realizing net shaping and reasonable design of tools.     

车轮轧制成形过程有限元分析

使用MSC.SuperForm对840火车轮轧制成形过程建立三维热力耦合有限元分析模型,研究分析了车轮立式轧制成形过程的金属变形规律.得出车轮轧制成形过程最大变形分布在辐板与轮辋连接处及轮辋外端靠近踏面处,轮辋外端变形明显大于轮辋内端变形,轮辋中心变形较难深透;车轮轧制中,辐板靠近轮辋端的金属周向流动明显,周向流动主要发生在轧制中后期;研究还得出车轮轧制过程各轧辊的受力及其变化情况,为制定车轮轧制工艺提供了参考.     

基于ANSYS的2150mm万能轧机机架模态分析

利用有限元软件ANSYS建立2150 mm万能轧机机架有限元模型,并对其进行模态分析,分别得出万能轧机主机架和立辊机架前15阶固有频率及振型图;通过振型图可直观分析出主机架与立辊机架的动态特性以及对实际生产影响最大的固有频率,为万能轧机的结构设计提供直接的理论依据。     

双机架紧凑式可逆炉卷轧机板材热连轧的温度场有限元研究

本文实现了对国内唯一一架双机架紧凑式可逆炉卷轧机板材热连轧的温度场有限元研究。采用弹塑性大变形热力耦合有限元法研究板材热连轧过程。利用有限元理论建立了板材热连轧模型,应用MSC／MARC软件进行计算,重点分析了轧制过程和变形区中轧件的温度场分布和变化。计算结果与实际生产情况相吻合,同时表明有限元理论可以实现对板材热连轧过程的数值模拟。     

带材异步冷轧时大变形弹塑性有限元模拟和实验

采用纠正的拉格朗日列式和基于弹塑性乘法分解的超弹性－塑性本构关系建立了大变形弹塑性有限元程序，并对铝带在不同条件下的异步冷轧过程进行数值模拟，同时对计算结果进行实验验证。结果表明，在异步轧制时，轧制压力对工作辊辊径的变化表现出非敏感性，而且变形区内静水压力绝对值比同步轧制时要小得多。     

轧机主传动系统动态特性有限元分析

针对轧机传动系统因负荷突变而引起的扭振现象,建立了轧机有限元模型,进行有限元模态分析和谐响应分析,找出了相应措施来减少轧机的振动,从而降低破坏概率,延长了设备寿命。     

A Newly Developed Upper‐Bound Approach for Calculating the Width Flow in Hot Rolling

This paper presents an investigation of the 3D metal‐forming process during hot flat rolling by an upper‐bound approach. The general aspects of this limit analysis refer to the volume deformation taking into account a polynomial propagation of the free side surfaces. In this approach the deformation region is limited by the roll‐gap entrance and exit with parallel planes. It is characterized by a non‐linear velocity field. A mathematical model of an upper‐bound calculation for the symmetrical flat rolling is developed in order to examine the influence of the most relevant functions, namely the velocity field together with the boundary conditions. A comparison of reasonable onsets is proposed. Therefore, the study can offer useful knowledge for better prediction of lateral flow.     

可逆式轧机十字轴式万向联轴器辊端叉头的有限元分析

运用ANSYS程序对辊端叉头进行三维有限元分析 ,找出其危险部位 ,确定其能长期承受的扭矩和短时能承受的最大扭矩。并对辊端叉头的结构和维护提出改进意见。     

宝钢某轧机4#机架主传动万向轴失效分析及改进

宝钢某轧机在投产较短时间之后,其象.根据既有的资料对传动系统各主要部件进行了比较和计算,对传动零件的失效情况进行了系统分析,指出了各部件的最薄弱点.并根据计算和分析结果,判断出十字销破断失效的原因,对十字销在材料、结构等方面进行了改进并投入实际应用.应用结果表明,改进后的十字销可以满足系统传动要求,有效地避免了类似失效事故的再次发生.     

Horizontal Velocity of Variable Gauge Rolling: Theory and Finite Elements Simulation

Within the production chain of longitudinal profiled (LP) plates and tailor rolled blanks (TRB), variable gauge rolling (VGR) represents the vital important forming stage, in which shape and properties are tailored to satisfy customers' requirements. It is of vital importance to reveal the relationship between work-piece horizontal velocity and roll vertical velocity during VGR, which is not only a key point to understand the deformation law, but also an important content for setting VGR process parameters. It is proved that the simplified assumption of equal discharge per second condition (EDSC) breaks down during VGR. Due to this reason the differential equation of the work-piece horizontal velocity (VGR-V) is performed by keeping the material volume constant. To attain a comprehensive understanding of this underlying process in detail, numerical approaches based on finite elements method have been performed by utilizing the Abaqus Explicit. Rolling experiment is carried out which indicates that the numerical result coincides with the experimental result well. A fine spatial discretization of work-piece is essential for special emphasis has to be put on detecting different horizontal velocity of work-piece cross section, often leading to a hundred thousand degrees of freedom even for plane strain calculations. The data obtained by using Abaqus Explicit coincide with the results determined by theory. A theoretical basis on deformation parameters and mechanical parameters during VGR process is provided.     

切分孔形状对轧件变形影响的有限元分析

采用三维大变形热力耦合有限元法分析了不同形状的切分孔对轧件变形的影响,探讨了轧制过程中轧件上的变形分布,研究了金属的流动规律以及对轧制力能参数的影响。模拟结果和实际轧制情况一致。通过模拟金属变形过程可为不同条件下正确设计切分孔提供依据。     

Finite Element Analysis for Effect of Roll Radius on Metal Deformation of Hot Rolling Plate

Theeffectofrollradiusonrollingforcehasbeenstudiedlargely ,buttheeffectofrollradiusondeforma tionofrollingpieceandontexturewasmentionedlit tle[1] .Therollradiusmayhaveaspecialinfluenceonthedeformationofrollingpiecebyaffectingtheformofdeformationzoneandaddi…     

开采引起地表沉陷规律的有限元分析

地表移动规律是采矿领域的重要研究内容。开采必将对覆岩、地表以及地表附属物造成影响,地表移动规律是反映影响程度的尺度。本文通过有限元分析计算得出哈拉钩矿开采后地表下状况,为研究该矿区地表移动规律提供定量的依据。     

1880热轧带钢工程加热炉区深基坑围护及土体位移有限元分析

软土地基深基坑开挖过程中,由于降水质量、基坑围护不同,或者土方开挖工况选择不当,常会引起土体位移,对管桩产生较大的土压力,出现基坑滑坡、桩身偏斜等质量事故,特别是大面积群桩整体位移,对工程本身将造成较大的经济损失和工期延误.采用桩土共同建模,桩土单元之间位移协调的有限元方法,将桩土单元集成总体刚度矩阵整体分析,对宝钢1880热轧带钢工程加热炉深基坑开挖过程进行研究,对比计算了基坑开挖对土体侧移和土体应力分布的影响,对施工工况的设计具有参考作用.     

三层复合铝箔的有限元分析

用MSC SuperForm软件对三层复合铝箔的轧制过程进行了有限元模型,得到了轧件的包覆板横向厚度分布特征。研究了压下量对横向厚度分布的影响,结果表明,通过改变压下量的大小,可以有效改善轧件的包覆板横向厚度分布不均的现象。     

整体式货架三维有限元分析

根据整体式货架的结构和承载特点,利用有限元分析软件ANSYS建立了其三维实体模型,在考虑了各种载荷的基础上,对其在各种载荷工况下的应力和位移进行了计算,为类似货架的设计计算提供了参考。     

板带粗轧不均匀变形行为的数值解析

针对攀钢热轧机组采用立辊调宽的特点,利用MSC.Marc有限元分析软件对板坯在立辊及水平辊轧制过程中的不均匀变形行为进行了离线模拟解析,分析了轧制工艺条件对轧后中间坯头尾形状尺寸及宽度的影响规律.模拟结果与实测值能较好地吻合.这对热轧寻求降低切损、提高成材率的措施具有一定的指导意义.     

钢包车焊接车架结构有限元分析与研究

利用三维机械设计软件SolidWorks,结合实际对钢包车进行设计,建立了有限元分析模型。根据钢包车工作状态模拟施加载荷和约束,采用有限元分析软件COSMOS／Works对焊接车架进行静态分析,最终得出钢包车的应力和应变云图,确定了危险点和危险截面。