Analysis of ultra-heavy plate rolling force based on thickness temperature gradient elements and experiment simulations

2016 ◽  
Vol 231 (4) ◽  
pp. 599-615 ◽  
Author(s):  
HY Wang ◽  
JG Ding ◽  
X Lu ◽  
DH Zhang ◽  
DW Zhao
Keyword(s):  
Temperature Gradient ◽  
Analytical Method ◽  
Rolling Force ◽  
Thickness Ratio ◽  
Slab Method ◽  
Heavy Plate ◽  
Plate Rolling ◽  
Different Temperatures

The thickness of the plate in temperature gradient rolling is first divided into 2  m elements, and m is an undetermined parameter which can be limited. Based on these thickness elements with different temperatures, the rolling force of this advanced process is first analyzed with slab method. Also the predictions of thickness ratio with different temperatures and reductions of each thickness elements are proposed in this paper. The results measured after rolling experiments are used to compare with these calculated by this model in order to verify its accuracy. In the experiment, a multi-metals riveting plate in the same temperature is designed to simulate a single metal one in gradient temperatures based on the thickness elements. Since the model is based on an analytical method which is strongly supported by the rolling theories, it can be applied in real gradient temperature rolling for ultra-heavy plate.

Development of a Mathematical Model of Plate Rolling on Hot Reversing Mills

2017 ◽  
Vol 746 ◽  
pp. 48-55
Author(s):  
Vasiliy V. Yashin ◽  
Evgenii V. Aryshenskii ◽  
Erkin D. Beglov ◽  
Maksim S. Tepterev ◽  
Anna F. Grechnikova
Keyword(s):  
Rolling Force ◽  
Work Roll ◽  
Calculation Model ◽  
Production Environment ◽  
Plate Rolling ◽  
Process Reliability ◽  
Calculation Results ◽  
Roll Gap ◽  
Relationship Of ◽  
Force Calculation

Objective of the work: develop a model for calculation of plate exit thickness. This model is supposed to improve process reliability in obtaining specified thickness with +/- 0.5 mm tolerance. The work identifies major influences on obtaining specified thickness and relationship of their effects. Based on derived relationships, the work develops rolling force calculation model with the following inputs: alloy grade, feedstock temperature, feedstock entry and exit gage, feedstock width, rotational speed of the rolls. Mill stand characteristics, like mill stiffness, backlash, work roll behavior, were studied in relation to force and temperature. The resulting model allows to predict the value of work roll gap increase during rolling. The model was validated in production environment and demonstrated high confidence level of calculation results.

Transport properties of an organic material under a temperature gradient

2019 ◽  
Vol 33 (19) ◽  
pp. 1950215 ◽  
Author(s):  
Lijuan Tang ◽  
Xinting Zhang ◽  
Baoying Yan ◽  
Lei Liu ◽  
Changhu Wang ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Master Equation ◽  
Transport Properties ◽  
Organic Material ◽  
Potential Application ◽  
Organic Materials ◽  
Clean Energy ◽  
Heat Energy ◽  
Energy Sources ◽  
Different Temperatures

Thermoelectric properties of organic materials have attracted much attention for the potential application in clean energy sources. In this work, we use the master equation method to calculate transport properties of the organic material when there is a temperature gradient in the material. The themoelectric property is analyzed with our model under different temperatures and different disorder strengths. It will be helpful to understand the thermoelectric property of organic materials and make good use of the heat energy.

scholarly journals Modal Analysis of a Simply Supported Steel Beam with Cracks under Temperature Load

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Yijiang Ma ◽  
Guoping Chen ◽  
Fan Yang
Keyword(s):  
Modal Analysis ◽  
Transfer Matrix ◽  
Analytical Method ◽  
Natural Frequencies ◽  
Steel Beam ◽  
Simply Supported ◽  
Local Flexibility ◽  
Temperature Load ◽  
Different Temperatures ◽  
Torsion Springs

Based on the transfer matrix method, an analytical method is proposed to conduct the modal analysis of the simply supported steel beam with multiple transverse open cracks under different temperatures. The open cracks are replaced with torsion springs without mass, and local flexibility caused by each crack can be derived; the temperature module is introduced by the mechanical properties variation of the structural material, and the temperature load is caused by the temperature variation, which can be transformed to the axial force on the cross-section. The transfer matrix of the whole beam with the temperature and geometric parameters of cracks can be obtained. According to boundary conditions of the simply supported beam, natural frequencies of the beam can be calculated, which are compared with the finite element results. Results indicate that the analytical method proposed has a high accuracy; the natural frequencies of the simply supported steel beam are mostly affected by the temperature load, which cannot be ignored.

Simulation of central crack closing behavior during ultra-heavy plate rolling

2009 ◽  
Vol 47 (2) ◽  
pp. 439-447 ◽  
Author(s):  
Wei Deng ◽  
De-wen Zhao ◽  
Xiao-mei Qin ◽  
Lin-xiu Du ◽  
Xiu-hua Gao ◽  
...  
Keyword(s):  
Central Crack ◽  
Heavy Plate ◽  
Plate Rolling

Finite Element Modal Analysis on 5500mm Heavy Plate Mill Rack

2013 ◽  
Vol 753-755 ◽  
pp. 1708-1711
Author(s):  
De Chen Zhang ◽  
Xing Lei Yao ◽  
Yan Ping Sun ◽  
Yuan Li
Keyword(s):  
Finite Element ◽  
Analytical Method ◽  
Computer Aided Design ◽  
Design Method ◽  
Vertical Vibration ◽  
Plate Mill ◽  
3D Design ◽  
Heavy Plate ◽  
Finite Element Software ◽  
Mill Stand

Aiming at the vibration problems in Anshan Iron 5500mm heavy plate mill production line, the mill frame vibration in the main parts is researched by using the computer aided design method and the analytical method. Using SolidWorks 3D design software for frame modeling, the model is imported into the ANSYS finite element software, then 5500mm heavy plate mill stand 12 order natural frequencies and natural vibration type is calculated; applying analytical method of the 12th band of vertical vibration the natural frequency is calculated, and the finite element results is analysed comparatively. This paper lays the foundation for the study of the vibration of the mill stand in the future, provides a theoretical basis for the dynamic design of the mill stand.

Methodology for draft schedule design of plate rolling process with peening effect considered

2009 ◽  
Vol 223 (9) ◽  
pp. 1159-1169 ◽  
Author(s):  
C H Moon ◽  
Y Lee
Keyword(s):  
Rolling Process ◽  
Correction Method ◽  
Thickness Ratio ◽  
Reduction Ratio ◽  
Roll Force ◽  
Plate Mill ◽  
Material Thickness ◽  
Roll Torque ◽  
Plate Rolling ◽  
Ratio Correction

We propose an approach for designing a draft schedule applicable to thick plate rolling. In the proposed approach, the peening effect, i.e. thick material is rolled with a small reduction ratio, is considered fully in computing roll force and torque. To determine an initial draft schedule, we calculate material thickness at each pass and total number of passes by taking the smallest of the critical reduction ratios (reduction ratio by maximum reduction increment, reduction ratio assigned in designing a plate mill, reduction ratios by allowable roll force and roll torque). To make a final draft schedule, we then propose two ways (thickness ratio correction (TRC) method and reduction ratio correction (RRC) method) that redistribute reduction ratios predetermined in the initial draft schedule. The proposed approach has been applied to POSCO No. 2 Plate Mill. Results reveal that the reduction ratios are determined by allowable roll torque if the material being rolled is relatively thick, but reduction ratios are decided by roll force as the material thickness being rolled decreases. It has been found that the thickness ratio correction method is useful when a heavy reduction ratio is necessary in the later part of the rough rolling sequence, and obtaining a uniform microstructure over material thickness during rolling is important. Meanwhile, the reduction ratio correction method is effective if surface defect generation on the material during rolling is a concern.

Load Spectrum Test and Numerical Simulation on the Rolling Rack for Dynamic Design and Control

2011 ◽  
Vol 346 ◽  
pp. 405-411
Author(s):  
Wu Zhao ◽  
Dan Huang
Keyword(s):  
Finite Element ◽  
Rolling Mill ◽  
Rolling Force ◽  
Sheet Thickness ◽  
Product Variety ◽  
Stable Operation ◽  
Field Calculation ◽  
Load Spectrum ◽  
Dynamic Design ◽  
Plate Rolling

The sustained rolling mill vibration on high-speed cold rolling mill or smooth mill could cause that periodicity sheet thickness difference or board light and dark stripes, or rolling processing interruption for the large vibration intensity. Dynamic load behavior of the rolling mill rack including the load magnitude and load property usually was the reason of the vibration, which caused the vibration modal with diversity and uncertainty. Three-dimensional solid modeling software and finite element analysis software had been used to realize computer simulation on deformation and stress field calculation of the rack rolling mill for completing rolling processing performance evaluation of the plate rolling mill. By strain gauges being layout to be half-bridge circuit in its suitable location to detect the one-direction strain on the rack, the loading capacity of rolling mill’s rack was studied for its dynamic characterization behavior. By extracting rolling force signal on actual measured and statistical analyzing calculations of experimental data on the plate rolling mill, rolling force load spectrum was obtained. Analysis model on rack was established in order to calculate and analyze mechanical and power parameters based on finite element method. It was used for improving dynamic design, also for analyzing mechanical and power parameters matching with increasing production and product variety under rolling schedule reinforcement. This study work provide theoretical foundation on ensuring stable operation of equipment, which was benefits on increasing production and product variety, even rolling processing potential scope.

A SOLVENT-EXTRACTION STUDY OF THE THERMODYNAMICS OF ANILINE AND ITS NITRATE

1966 ◽  
Vol 44 (4) ◽  
pp. 521-525 ◽  
Author(s):  
A. Aboul-Seoud ◽  
M. Doheim
Keyword(s):  
Solvent Extraction ◽  
Sodium Nitrate ◽  
Analytical Method ◽  
Distribution Coefficients ◽  
Distribution Method ◽  
Aqueous Sodium ◽  
Extraction Study ◽  
Different Temperatures ◽  
Extracting Solvent ◽  
Nitrate Solutions

The distribution coefficients of aniline between n-heptane and aqueous sodium nitrate solutions were measured at different temperatures. The activity coefficients of aniline in aqueous sodium nitrate solutions were determined. The effect of sodium nitrate on the dissociation of the anilinium ion was studied at different temperatures by a modified distribution method. Attention was directed to the choice of the extracting solvent and of the analytical method. The effect of the presence of undissociated anilinium ions on the distribution coefficients was taken into consideration.K0, Kb, ΔH, ΔF, and ΔS for the dissociation of the anilinium ion were evaluated.

scholarly journals Modeling of rolling force of ultra-heavy plate accounting for gradient temperature

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110476
Author(s):  
Shun Hu Zhang ◽  
Li Zhi Che
Keyword(s):  
Temperature Distribution ◽  
Velocity Field ◽  
Decomposition Method ◽  
Rolling Force ◽  
Metal Flow ◽  
Maximum Error ◽  
Root Vector ◽  
Force Model ◽  
Heavy Plate ◽  
Vector Decomposition

In this paper, the nonlinear specific plastic power of the Mises criterion is integrated analytically to establish the rolling force model of gradient temperature rolling for an ultra-heavy plate by a new method called the root vector decomposition method. Firstly, the sinusoidal velocity field is proposed in terms of the characteristics of metal flow during ultra-heavy plate rolling, which satisfies the kinematically admissible condition. Meanwhile, the characteristics of the temperature distribution along the thickness direction of the plate during the gradient temperature rolling is described mathematically. Based on the velocity field and the temperature distribution expression, the rolling energy functional is obtained by using the root vector decomposition method, and the analytical solution of rolling force is derived according to the variational principle. Through comparison and verification, the rolling force model solved by the root vector decomposition method in this paper is in good agreement with the measured one, and the maximum error of the rolling force is just 10.21%.

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