Finite Element Analysis on Chattering in Cold Rolling and Comparison With Experimental Results

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Reza Mehrabi ◽  
Mahmoud Salimi ◽  
Saeed Ziaei-Rad
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Rolling Process ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Mill Stand ◽  
Predicted Values ◽  
Lumped Masses ◽  
Roll Gap ◽  
Good Agreement

In this paper, the chattering phenomenon in cold rolling is investigated in reference to the finite element method (FEM). The structure of the mill stand is modeled as a system of linear springs and lumped masses while the rolling process is modeled utilizing an implicit FEM. Assembling the two models makes it possible to detect the chatter during the rolling process. The assembled model is capable of perceiving variations in forces generated during the process that deflects the structure of the mill leading to variations at the roll gap and the roll speed. The influences of some rolling parameters on chatter vibration are investigated. Predicted values of the model are in good agreement with that of the experiments as well as the values obtained by other researchers.

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

Finite Element Analysis of Thin Strip Profile in Asymmetric Cold Rolling Considering Work Roll Crossing and Shifting

2014 ◽  
Vol 1061-1062 ◽  
pp. 515-521 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Finite Element Model ◽  
Rolling Force ◽  
Element Model ◽  
Work Roll ◽  
Rolling Process ◽  
Thin Strip ◽  
Asymmetric Rolling ◽  
Element Analysis

Cold rolled thin strip has received a great deal of attention through technological and theoretical progress in the rolling process, as well as from researchers who have focused on some essential parameters of strip such as its shape and profile. This paper describes the development of a 3-D finite element model of the shape of thin strip during cold rolling to simulate the cold rolling of WCS (work roll crossing and shifting) in asymmetric rolling. This finite element model considers the asymmetrical rolling parameters such as variations in the diameters of the rolls and the crossing angle as the work roll shifts on the strip during cold rolling. The shape and profile of the strip are discussed in the asymmetrical and symmetrical rolling conditions, while the total rolling force and distribution of stress are discussed in the case where the roll cross angle and axial shifting roll changes. The results can then be used to control the shape and profile of thin strip during rolling.

A Finite Element Analysis of Electromagnetic Forming for Tube Expansion

1994 ◽  
Vol 116 (2) ◽  
pp. 250-254 ◽  
Author(s):  
Sung Ho Lee ◽  
Dong Nyung Lee
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Deformation ◽  
Electromagnetic Forming ◽  
Tube Axis ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Tube Expansion ◽  
Good Agreement

The electromagnetic field and dynamic deformation analyses for tube expansion by electromagnetic forming were performed by the finite element method. A realistic pressure distribution was calculated by taking into account both coil and workpiece. The calculated values of displacement along the tube axis and with time were in very good agreement with the measured ones.

Dynamic Finite Element Analysis of Cracked Bodies

1980 ◽  
Vol 102 (1) ◽  
pp. 2-7 ◽  
Author(s):  
J. L. Glazik
Keyword(s):  
Finite Element ◽  
Vibrational Modes ◽  
The Finite Element Method ◽  
Singular Element ◽  
Element Analysis ◽  
Element Mesh ◽  
Dynamic Finite Element Analysis ◽  
Mass Matrices ◽  
Maximum Amplification ◽  
Good Agreement

Application of the finite element method to problems involving finite cracked bodies subjected to impact loadings is discussed. Mass matrices for a particularly simple, well-established singular element have been developed and applied to the problem of a centrally cracked strip whose ends are loaded by a step tensile stress. The results agree extremely well with those obtained by using a higher order singular element. Results are also presented for this problem employing an equally coarse finite element mesh with no singular element at all, and again good agreement is demonstrated. The problems of an edge cracked strip suddenly pulled at its ends and of a cracked cylinder subjected to sudden internal pressure are also analyzed using these two approaches. The response of these examples, like the majority of cracked finite bodies, are dominated by their vibrational modes. Results indicate that for the purpose of determining the maximum amplification of the stress intensity factor due to dynamic loading, the use of a singular element is unnecessary.

Finite Element Simulation Analysis of Multi-Stands Three-Roller Cold Rolling Process for Double Metal Composite Seamless Steel Tube

2013 ◽  
Vol 470 ◽  
pp. 197-204 ◽  
Author(s):  
Xian Kang Wang ◽  
Jin Duo Ye ◽  
Xu Ma ◽  
Qian Qian Tian ◽  
Xue Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Cold Rolling ◽  
Rolling Process ◽  
Steel Tube ◽  
Metal Composite ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Seamless Steel Tube ◽  
Seamless Steel

The numerical simulation of the Y-type three-roller two stands cold rolling stainless steel/carbon steel double metal composite seamless steel tube process was conducted through the finite element analysis of the elastic-plastic by applying the MSC.MARC software. Based on the numerical simulation, the character of stress and strain distribution parameters during the Y-type three-roller two stands cold rolling were obtained by the finite element analysis, and acquired the section pass deformation figure. The distribution of the axial stress, circle stress and radial stress were drawn below the Y-type mill along the circle. The mechanism of the tube cold rolling process and the effect of the forming steel tube both the diameter and wall thickness accuracy were explained according to the stress distribution. The results of the research can be applied to the design of the technical parameters in the forming process.

Effect of Roll Configuration on the Leveling Effectiveness of Tail-Up Bent Plate Using Finite-Element Analysis

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Jae Hyung Seo ◽  
Chester J. Van Tyne ◽  
Young Hoon Moon
Keyword(s):  
Finite Element ◽  
Work Roll ◽  
Internal Stresses ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Plate Shape ◽  
Vertical Displacements ◽  
Roll Gap ◽  
Bent Plate ◽  
Bent Plates

The finite-element method (FEM) has been used to numerically investigate the effect of work roll configuration on the leveling effectiveness of tail-up bent plates. Leveling is a process used to minimize shape defects, including flatness imperfections and uniformity of internal stresses in shape-critical applications. Leveling plays an important role in delivering the desired plate shape and meeting the required product standards. To simulate the roller leveling effectiveness of tail-up bent plates, an initially flat plate was plastically bent prior to leveling and was passed through the leveling rolls. Leveling effectiveness was estimated by the vertical displacements of tail-up bent plates with two different roll configurations. One configuration adopts a gradually increasing roll gap, while the other configuration maintains the same roll gap in the first two sets of rolls and gradually increases the roll gap for the later rolls. For comparison purposes, the entry and exit roll gaps of the two roll configurations are set to the same roll gap. To verify the accuracy of the numerical simulations, actual leveling experiments were performed using tail-up bent plates. The results show that the roll configuration significantly influences the leveling effectiveness of the tail-up bent plates. Higher leveling effectiveness is obtained for a leveling configuration that imparts more severe deformation at the earlier leveling stages. Through the analysis, the work roll configuration is determined to be essential to increase leveling effectiveness of tail-up bent plates.

Finite Element Analysis of Four-Roll Pass Cold Rolling

1992 ◽  
Vol 206 (2) ◽  
pp. 133-141 ◽  
Author(s):  
S W Wen ◽  
P Hartley ◽  
I Pillinger ◽  
C E N Sturgess
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cold Rolling ◽  
Cross Sections ◽  
Rolling Process ◽  
Roll Pass ◽  
Element Analysis ◽  
Finite Element Program ◽  
Iron And Steel ◽  
Element Program

This paper presents a study of the mechanics of deformation of the four-roll pass cold rolling using an elastic-plastic finite element program. This process has been developed at the Anshan Institute of Iron and Steel Technology, People's Republic of China, where a new four-roll pass small section cold rolling mill has been built. The initial finite element analysis has been carried out for the rolling of 8 mm square section bar from 10 mm diameter round stock under dry friction conditions. The results show clearly how the areas of plastic deformation develop during the rolling process. The distributions of the generalized stress and the generalized plastic strain, both on the longitudinal symmetrical plane and on the transverse cross-sections of the workpiece, have been obtained, and the pressure distribution along the arc of contact has been determined. In addition, the roll separation force and the pass elongation of the workpiece predicted by the finite element program have been compared with the corresponding values measured in experiments when rolling 6.5 mm square section bar from 8 mm round material with machine oil lubrication. Good agreement has been obtained.

3D Thermal Mechanical Coupled Elasto-Plastic Finite Element Analysis in the Whole Rolling Process of H-Beam

2008 ◽  
Vol 575-578 ◽  
pp. 532-538 ◽  
Author(s):  
Guo Ming Zhu ◽  
Yong Lin Kang ◽  
Wei Chen ◽  
Guang Ting Ma
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Rolling Process ◽  
Temperature Data ◽  
Measured Temperature ◽  
Element Analysis ◽  
Whole Process ◽  
Microstructure Prediction ◽  
H Beam ◽  
Good Agreement

In the H-beam rolling process, the deformations and temperature field of workpiece significantly influence the mechanical properties due to the change of product microstructure. Prediction of them is important for the groove design and passes sequences. To get the deformation behavior and the temperature field of workpiece, commercial FEM program LS-DYNA has been used to analyze the whole process of H-beam rolling. The approach is based on 3D thermal mechanical coupled finite element method. The rolling process is divided into several units for calculation. The mesh of workpiece is rebuilt in the simulation for reducing the influence of element distortion. The result shows that, the temperature at the wed to flange position maintains the highest during the whole rolling process, while area of the web the lowest. After the rolling, temperature difference is above 150K between the web’s surface and flange’s inside surface, approximate 130K on the flange’s outside surface and 200K in the cross section. The simulation results show good agreement with the measured temperature data.

The Application of Finite Element Analysis Software MSC.Marc in Numerical Simulation of Fabric

2011 ◽  
Vol 332-334 ◽  
pp. 2116-2119
Author(s):  
Cui Yu Li ◽  
Rui Wang
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Woven Fabric ◽  
The Finite Element Method ◽  
Analysis Software ◽  
Element Analysis ◽  
Large Rotation ◽  
Shell Elements ◽  
Gravity Load ◽  
Good Agreement

The draping and buckling of woven fabric are simulated with the finite element method based on the micro-mechanical constitutive model and orthotropic constitutive model under gravity load. Compared with the traditional orthotropic mechanical model of the fabric, the micro-mechanical constitutive model characterizes the special properties of woven fabric due to its micro-weaving structures. The woven fabric sheet is discretized with 8-nodes shell elements which are designed for finite deformation and suffice to describe the large rotation of fabric sheet during draping, for the sake of simplicity, the nodes of the fabric sheet on the edges of the desk are assumed to be fixed. Compared with the experimental ones, the simulation results with the micro-mechanical constitutive model are in good agreement with the observations. The work paves the way for developing a virtual clothes trial system.

Thermomechanical behaviours of strip and work-rolls in cold rolling process

2011 ◽  
Vol 46 (8) ◽  
pp. 794-804 ◽  
Author(s):  
B Koohbor ◽  
S Serajzadeh
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
High Speed ◽  
Contact Region ◽  
Computational Cost ◽  
Work Roll ◽  
Rolling Process ◽  
Element Formulation ◽  
Element Analysis ◽  
Thermomechanical Behaviour

A finite element analysis was developed to determine thermomechanical behaviours of strip and work-roll during cold rolling process under practical rolling conditions. The velocity field was first obtained using a rigid-plastic finite element formulation and then it was used to assess the strain and stress distributions within the strip and at the same time, a thermal finite element model based on streamline upwind Petrov–Galerkin scheme was employed to predict temperature distribution within the metal being rolled. In the next stage, the predicted temperature and stress fields at the contact region of strip/work-roll were employed as the boundary conditions to evaluate the thermomechanical behaviour of the work-roll while the effect of back-up rolls was also considered in the mechanical part of the analysis. The model is shown to provide a proper insight for studying the deformation of strip and work-roll during high speed cold rolling process with a relatively low computational cost.

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