Thermal Behavior of Aluminum Rolling

1990 ◽  
Vol 112 (2) ◽  
pp. 301-308 ◽  
Author(s):  
A. A. Tseng ◽  
S. X. Tong ◽  
S. H. Maslen ◽  
J. J. Mills
Keyword(s):  
Heat Transfer ◽  
Aluminum Alloys ◽  
Hot Rolling ◽  
High Speed ◽  
Critical Factor ◽  
Work Roll ◽  
Operating Parameters ◽  
Temperature Profiles ◽  
Rolling Mills ◽  
Heat Transfer Theory

Proper roll cooling has been identified as a critical factor in the problems of excessive roll spalling and poor thermal crowning in modern, high-speed rolling mills. In this paper, an analytical model has been developed to determine the temperature profiles of the roll and the strip. This model uses basic heat transfer theory and provides the capability of studying the influence of operating parameters on both the work-roll and workpiece temperatures. Examples on cold and hot rolling of aluminum alloys are given to demonstrate the feasibility and capability of the model developed. Previous work on thermal modeling of rolling processes is also briefly reviewed.

scholarly journals Finite elements prediction of thermal stresses in work roll of hot rolling mills

2010 ◽  
Vol 2 (1) ◽  
pp. 707-716 ◽  
Author(s):  
D. Benasciutti ◽  
E. Brusa ◽  
G. Bazzaro
Keyword(s):  
Finite Elements ◽  
Hot Rolling ◽  
Thermal Stresses ◽  
Work Roll ◽  
Rolling Mills

scholarly journals Coupled Vibration Characteristics Analysis of Hot Rolling Mill with Structural Gap

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Guangxu Zhang ◽  
Jiahan Bao ◽  
Wenhao Li ◽  
Zhichong Wang ◽  
Xiangshuai Meng
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Process Model ◽  
Elastic Recovery ◽  
Rolling Force ◽  
Excitation Amplitude ◽  
Work Roll ◽  
Rolling Process ◽  
Structure Model ◽  
Rolling Mills

It is important to study the vibration of rolling mills to improve the stability of rolling production. A dynamic rolling process model is established by considering the elastic recovery of the exit strip and the influence of multiroll equilibrium, and the accuracy of the model is verified by experimental data. On this basis, based on the distribution of friction force in the deformation zone, the rolling force and rolling torque are nonlinearized. In addition, a rolling mill structure model is established by considering the structure gap and a piecewise nonlinear horizontal-vertical-torsional vibration model of the rolling mill is established by combining the structure model and dynamic rolling process model. Finally, the amplitude-frequency characteristics of the work roll under different external excitation amplitude and the dynamic bifurcation characteristics of the work roll under different gaps are analyzed. The study indicates that, by reducing excitation amplitude and structure gap, the system vibration can be reduced. The research results can provide a theoretical reference for further exploration of the coupling vibration of hot rolling mills.

Laminar Free Convection from a Rotating Radial Plate

1972 ◽  
Vol 94 (4) ◽  
pp. 419-424 ◽  
Author(s):  
G. S. H. Lock ◽  
R. S. Ko
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
High Speed ◽  
Numerical Solutions ◽  
Temperature Profiles ◽  
Governing Equations ◽  
High Speed Rotation ◽  
Convection Problem ◽  
Speed Rotation ◽  
Radial Plate

The paper presents a theoretical analysis of conduction through, and free convection from, a radial plate rotating in a synchronous environment of air. The plate resembles a tapered, radially protruding fin heated at the root. Ordering of the governing equations reveals three controlling parameters, under the condition of steady high-speed rotation. Numerical solutions to the combined conduction–convection problem reveal the effect of the parameters on the velocity and temperature profiles, the overall heat-transfer relation, and the fin effectiveness.

scholarly journals Effects of the Solder Phase Transformation on the Optimization of Reflow Soldering Parameters and Temperature Profiles

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Yongze Xu ◽  
Yu Liu ◽  
Lei Zhang
Keyword(s):  
Heat Transfer ◽  
Transfer Problem ◽  
Linear Equations ◽  
Transition Process ◽  
Coefficient Matrix ◽  
Temperature Profiles ◽  
Conduction Model ◽  
Reflow Soldering ◽  
Heat Transfer Theory ◽  
Convection Model

In this study, a heat convection model of the reflow oven and a heat conduction model of the soldering area are proposed based on heat transfer theory, and a dynamic Thomas algorithm is developed for solving linear equations with coefficient matrix evolving over time in the tridiagonal system, which is derived from a heat transfer problem with moving boundaries in the solder phase transition process. We have also carried out numerical simulations for investigating the accuracy of the mathematical model, in which the temperature profiles are calculated and compared for different cases with considering or ignoring phase transformations, respectively. Parameters of reflow soldering, such as the conveyor speed, the set temperature in each zone, and a part of the heating factor, are optimized by the use of the nondominated sorting genetic algorithm II. By comparing the temperature profile and optimal solutions in the two cases, numerical results show that phase transitions of the solder have great impacts on optimal parameters and the slope of temperature profiles. Moreover, the phenomenon that the heating factor varies with the maximum set temperature in a banded distribution is investigated and analyzed, which is an important part of this work.

scholarly journals Temperature distribution of a test specimen with high-speed heat air-flow passing through

2018 ◽  
Vol 22 (6 Part A) ◽  
pp. 2527-2538 ◽  
Author(s):  
Kai Xiong ◽  
Yunhua Li ◽  
Sujun Dong
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Test Specimen ◽  
High Speed ◽  
Air Flow ◽  
Prediction Method ◽  
Average Temperature ◽  
Hot Air ◽  
Heat Transfer Theory ◽  
Good Agreement

In this paper, a solution method for the temperature distribution of rectangular test specimen with a high-speed heat air-flow passing through is proposed based on the heat transfer theory and numerical calculation, and the feasibility of temperature prediction method is validated. Firstly, the partial differential equations to describe the average temperature in the section of the hot air-flow and the specimen are established and the solving method using MATLAB solver is proposed. Then, based on heat transfer conduction equation and the average temperature, the temperature distribution at different point in each section is calculated. The comparison between numerical computation and experiment shows that two results are in good agreement, which verifies the correctness of the presented prediction method of the temperature distribution of the specimen.

A New One-Sided Joining Process for Aluminum Alloys: Friction Stir Blind Riveting

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Dalong Gao ◽  
Ugur Ersoy ◽  
Robin Stevenson ◽  
Pei-Chung Wang
Keyword(s):  
Aluminum Alloys ◽  
High Speed ◽  
Tensile Load ◽  
Operating Conditions ◽  
Frictional Heat ◽  
Operating Parameters ◽  
Friction Stir ◽  
Wide Range ◽  
Riveting Process ◽  
Joining Process

Friction stir blind riveting is a new joining process for one-sided joining (compared with the two-sided access required for, for example, self-piercing riveting) of aluminum alloys, which eliminates the need to predrill a hole for rivet insertion. A blind rivet rotating at high speed is brought into contact with the workpieces, thereby generating frictional heat between the rivet and the workpiece, which softens the workpiece material and enables the rivet to be driven into the workpieces under reduced force. Once fully inserted, the blind rivet is upset using the internal mandrel (as in a conventional blind riveting process) to fasten the workpieces together. Our study showed that friction stir blind riveting process can be carried out over a wide range of operating parameters. The resulting joints show consistent strength under tensile load with minimal influence of changes in operating parameters. The robustness of the process against variations in operating conditions shows that the process can be carried out without high-end equipment and without requiring precise initial setup. It also suggests that the process is feasible for rapid joint fabrication in volume production. Further study revealed superior static and fatigue strength from the friction stir blind riveting process, when compared with conventional spot welding, which suggests potential for reduction in the number of joints required in a structure.

A Study of Abrasive Wear on High Speed Steel Surface in Hot Rolling

2016 ◽  
Vol 846 ◽  
pp. 589-594 ◽  
Author(s):  
T. Hoang Phan ◽  
Ahn Kiet Tieu ◽  
Hong Tao Zhu ◽  
Bu Yung Kosasih ◽  
Qiong Wu ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Hot Rolling ◽  
High Speed ◽  
High Speed Steel ◽  
Work Roll ◽  
Contact Friction ◽  
Strip Surface ◽  
Debris Slide ◽  
Physically Based ◽  
Work Rolls

In hot rolling, the thermal cyclic of work rolls causes a superficial oxide scale, which plays an important role on the contact friction and wear. The asperities of oxidised strip surface and wear debris slide over the High Speed Steel (HSS) work roll surface which comprises of hard carbides within an iron matrix under high pressure and velocity. Abrasive wear occurs and the particles will be removed from HSS surface. The current study introduces the Discrete Element Method (DEM) to investigate this abrasive wear phenomenon. The model successfully provides a physically based abrasive roll wear predication of HSS work roll with the consideration of carbides and oxide layers. It has been found that the carbide shape in the HSS roll affects the wear significantly, which has not been reported by previous numerical simulations and is the main focus of this research.

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