Temperature Distribution of Taper Rolls in Preheating Furnace of Cold Rolling Continuous Annealing Line

2010 ◽  
Vol 31 (10) ◽  
pp. 880-888 ◽  
Author(s):  
Chang-Hsien Ho ◽  
Tei-Chen Chen
Keyword(s):  
Temperature Distribution ◽  
Cold Rolling ◽  
Continuous Annealing

Steady-State Temperature Distribution in a Rotating Roll Subject to Surface Heat Fluxes and Convective Cooling

1981 ◽  
Vol 103 (1) ◽  
pp. 36-41 ◽  
Author(s):  
E. J. Patula
Keyword(s):  
Steady State ◽  
Temperature Distribution ◽  
Cold Rolling ◽  
Heat Input ◽  
Surface Heat ◽  
Heat Fluxes ◽  
Solution Technique ◽  
Convective Cooling ◽  
Roll Temperature ◽  
Steady State Temperature

With the higher rolling speeds used in modern cold-rolling mills, proper roll cooling has become a critical factor in avoiding problems of excessive roll spalling and poor thermal crowning. Poor thermal crowning of rolls can severely affect the shape and profile of sheet and strip products. To determine the influence of cooling practices on roll temperature, a mathematical model was developed that determines the two-dimensional (radial and circumferential) steady-state temperature distribution in a rotating roll subject to constant surface heat input over one portion of the circumference and convective cooling over another portion of the circumference. The model is analytical in nature, as opposed to a direct numerical simulation, which enables extensive parametric studies to be performed conveniently. The solution technique can be used to solve numerous problems involving any combination of surface boundary conditions that have, at most, a linear dependence with respect to the surface temperature. With the use of the principle of superposition, the present solution can be utilized to solve problems where various regions of the surface have constant heat fluxes. Results of the present analysis indicate that for normal cold-rolling situations during steady operation, the penetration of the effects of the surface heating and cooling that occur during every roll revolution is usually less than 4 percent of the radius. Furthermore, the bulk of the roll is at a uniform temperature that can be calculated quite accurately by neglecting all internal temperature gradients. The location of the cooling regions relative to the heat-input regions has little effect on the bulk roll temperature in this situation. This approximation would be useful for computing bulk roll temperature, which could be utilized in future models for determining thermal crowns, but would not be suited for determining accurate temperatures at the roll surface.

Mathematical Model for Temperature Distributions of Work Roll in Aluminum Strip Cold Rolling

2010 ◽  
Vol 150-151 ◽  
pp. 97-101
Author(s):  
De Dong Gao ◽  
Shan Wang
Keyword(s):  
Temperature Distribution ◽  
Cold Rolling ◽  
Contact Region ◽  
Work Roll ◽  
Rolling Process ◽  
Backup Roll ◽  
Friction Heat ◽  
Roll Pressure ◽  
Temperature Distributions ◽  
Aluminum Strip

The temperature distribution of the work roll affects the shape and size of final product in aluminum strip cold rolling process. The segmental model is presented to explore the boundaries of the roll. The surface of the work roll is divided into 5 different regions including the outlet roll-strip contact region, the inlet roll-strip contact (bite) region, the roll-spray region, the roll-air region and the roll-roll contact region. Based on the analysis of the roll pressure, the mathematical models of the plastic doformation work and friction heat are proposed to calculate the temperature variation in bite region. The boundaries, including heat convection with lubricant/air and heat conduction with the backup roll, are considered to model the work roll’s temperature distribution.

Data-Based Hybrid Tension Estimation and Fault Diagnosis of Cold Rolling Continuous Annealing Processes

2011 ◽  
Vol 22 (12) ◽  
pp. 2284-2295 ◽  
Author(s):  
Qiang Liu ◽  
Tianyou Chai ◽  
Hong Wang ◽  
Si-Zhao Joe Qin
Keyword(s):  
Fault Diagnosis ◽  
Cold Rolling ◽  
Continuous Annealing

Development and Application of Experimental Facilities for Steel Forming

2008 ◽  
Vol 575-578 ◽  
pp. 1428-1432
Author(s):  
Zong An Luo ◽  
Guo Dong Wang ◽  
Xiang Hua Liu ◽  
Jian Ping Li ◽  
Li Jun Wang ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Hot Rolling ◽  
Cooling System ◽  
Continuous Annealing ◽  
Controlled Cooling ◽  
Processing Technologies ◽  
Iron And Steel ◽  
Rolling Mills ◽  
Cold Rolling Mills ◽  
Experimental Facilities

In order to meet the demand of steelmakers, series of experimental facilities such as thermo-mechanical simulator, pilot hot rolling mills, controlled cooling system, pilot cold rolling mills, simulator for continuous annealing of strips, and hot-dip galvanizing simulator have been developed and applied by the RAL. These instruments can be used to simulate different processing technologies of steel forming which include continuous casting, hot rolling, controlled cooling, cold rolling, annealing and surface treatment(such as coating), etc. They provide unique research means for the R&D activities of China’s iron and steel industries. The characteristics, experimental functions, performance parameters and application of these facilities are introduced in the paper.

Effect of Ferritic Hot Rolling Process on Microstructure and Properties of IF Steel

2020 ◽  
Vol 993 ◽  
pp. 505-512
Author(s):  
Wen Gao Chang ◽  
Wei Yu ◽  
Huan Yang ◽  
Zeng Qiang Man ◽  
Yun Fei Cao
Keyword(s):  
Cold Rolling ◽  
Hot Rolling ◽  
Rolling Texture ◽  
Rolling Process ◽  
Continuous Annealing ◽  
If Steel ◽  
Coiling Temperature ◽  
Microstructure And Properties ◽  
Hot Rolling Process ◽  
Cold Rolling And Annealing

The effect of ferritic hot rolling process on microstructure and properties of Ti microalloyed IF steel was investigated. The hot rolling-coiling, cold rolling and continuous annealing processes of ferritic zone were physically simulated. The influence of thermal deformation (finishing rolling temperature, coiling temperature) on the structure, texture and forming properties of Ti-If steel was studied through tensile test, EBSD, XRD and other analytical methods. The results showed that the recrystallization occurred after hot rolling and coiling in the ferritic region. Weak α-fiber and weak γ-fiber were obtained in the central layer of hot rolling plates, and the strength of γ-fiber was higher when finished rolling at low temperature. α-fiber and weak γ-fiber were strengthened after cold rolling. After annealing, the α-fiber was weakened and the γ-fiber was strengthened, and the γ-fiber became the main texture. The larger and more uniform grain size and better mechanical properties were obtained by IF steel finished rolling and coiling at high temperature and after continuous annealing, reaching yield strength of 106 MPa, tensile strength of 297 MPa, elongation rate of 52%, n value of 0.26 and r value of 2.3. The hot rolling texture is hereditary. If the more γ-fiber is formed after hot rolling, the more γ-fiber recrystallization texture is formed after cold rolling and annealing.

Study of Texture in 6016 Aluminum Alloy during Processing

2016 ◽  
Vol 877 ◽  
pp. 356-362
Author(s):  
Zhang Wen ◽  
Ying Ying Liu ◽  
Zhi Hong Jia ◽  
Pi Zhi Zhao ◽  
Zhi Qing Zhang ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Shear Bands ◽  
Deformation Texture ◽  
Continuous Annealing ◽  
Intermediate Annealing ◽  
X Ray Diffraction ◽  
6016 Aluminum Alloy ◽  
Cold Rolled ◽  
Hot Rolled ◽  
Rolled Plates

The evolution of texture in AA6016 alloy during processing was systematically investigated. The hot-rolled 6016 plates were cold-rolled to 0.9mm through three different rolling processes. One was directly rolled to 0.9mm, the other two were rolled to 1.8mm and 2.3mm, respectively, followed by intermediate annealing at 360°C for 2h, and then rolled to 0.9mm. Finally, the three kinds of cold rolled plates were performed continuous annealing at 560oC. The textures and microstructures of each stage were characterized by the X-ray diffraction and electron back scattering diffraction (EBSD) techniques. The results show that the texture of hot-rolled sample is mainly composed of Brass, S and Copper; the relative amount and maximum density changed after 1st cold-rolling. After intermediate annealing, the Cube and Cube+ND20 texture replace the deformation texture and rise with the rolling reduction. Then the conducting of final cold rolling results in the decrease of Cube and Cube+ND20 component and increase of deformation texture. After the continuous annealing, R, Brass-R, Goss, Cube and Cube+ND20 components are observed. Particle stimulated nucleation (PSN) and nucleation at shear bands dominate the competition of recrystallization.

Study of Microstructure and Texture of Nb-IF High Strength Steel after Cold Rolling and Annealing

2012 ◽  
Vol 538-541 ◽  
pp. 1208-1212 ◽  
Author(s):  
Zi Yong Hou ◽  
Yun Bo Xu ◽  
Di Wu ◽  
Guo Dong Wang
Keyword(s):  
Cold Rolling ◽  
Optical Microscopy ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Continuous Annealing ◽  
Electron Backscattered Diffraction ◽  
Batch Annealing ◽  
Cold Rolling And Annealing ◽  
Cold Rolled

The effects of annealing routes (batch annealing and continuous annealing) on the development of microstructure and texture in a cold-rolled Nb-IF high strength steel sheet were studied by means of optical microscopy(OM), electron backscattered diffraction(EBSD) and ODF analysis. The results show that the finer and more homogenous recrystallization grain can be observed in the CA steel. The CA process leads to an increase in the intensity of the γ-fibers, and the very sharp and uniform γ-fibers are found in this case, which is beneficial to the deep-drawability.

Application of a Continuous Annealing Process to the Production of Superplastic High-Carbon Steels

1990 ◽  
Vol 196 ◽  
Author(s):  
K. Seto ◽  
T. Kato ◽  
H. Abe
Keyword(s):  
Cold Rolling ◽  
Large Strain ◽  
Rate Sensitivity ◽  
Ferrite Matrix ◽  
Production Method ◽  
Carbon Steels ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Sensitivity Index ◽  
High Carbon

ABSTRACTHigh-carbon steels with carbon content of more than 0.8wt% have been known to be superplastic by refining their microstructure. Many methods such as warm rolling have been proposed to refine the microstructure. But most of them are considered to be difficult to use as an actual production method. To make high-carbon steels superplastic and economical, application of a cold rolling and continuous annealing process has been examined.Changes in microstructure of high-carbon hot rolled steels during the cold rolling and continuous annealing was investigated. By cold rolling with a reduction of more than 50%, a lamellar pearlite structure is deformed and heavily sheared, and a large strain energy is stored. Rapid annealing at temperatures just below the A1 temperature(1000K) is shown to spheroidize the sheared pearlite and to recrystallize the ferrite grains. After processing, the final structure consists of very fine cementite particles with 0.05–0.2μm diameter in a very fine equiaxed ferrite matrix with 0.1–0.5μm diameter. The processed steel shows total elongations of more than 700% and a strain rate sensitivity index of about 0.5 when deformed at 973K.

Studying Temperature Variations that Occurred during Cold and Hot Rolling of AA5454-O Alloy

2017 ◽  
Vol 267 ◽  
pp. 45-51
Author(s):  
Sinan Sezek ◽  
Bunyamin Aksakal
Keyword(s):  
Plastic Deformation ◽  
Temperature Distribution ◽  
Cold Rolling ◽  
Temperature Variation ◽  
Hot Rolling ◽  
Rolling Process ◽  
Laboratory Equipment ◽  
Temperature Variations ◽  
Average Temperature ◽  
Hot And Cold Rolling

In this study, temperature distribution that occurred during cold and hot rolling of AA5454-O alloy has been investigated. Temperature variation taking place in the aluminium alloy that has undergone plastic deformation between the rollers during hot and cold rolling process is of major importance in terms of determining the positive and negative characteristics or features which such temperature variation adds to the formation of the internal structure of the material concerned. Temperature distribution has been measured by use of the installed laboratory equipment and respective data recorded has been presented in the form of graphic charts. Temperature distribution has varied depending on the application of hot or cold rolling process and it has been noted that variations in terms of temperature reduction took place depending on the number of roll passes. While average temperature variation has occurred as a 16°C increase in the case of cold rolling, it has been observed that such variation appeared as a 100°C decrease on the average in the case of hot rolling.

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