Research on rolling force model in hot-rolling process of aluminum alloys

A 3-D thermal-mechanical model was built to simulate the hot rolling process of medium plate, with the aid of nonlinear commercial FE code MSC.SuperForm on a company's actual process parameters. The hot rolling process of single-pass which slab thickness is 180mm was simulated, and the influence of pass reduction on metal flow, stress-strain field, contact stress and rolling force were researched. The study revealed that pass reduction should be at least 20% by increase depress in pass in addition to rolling efficiency. As that, rolling efficiency be increased, roll contact stress be brought down, and its service life be prolonged. And metal plastic strain enhanced, metal flow increased, but its strain field non-uniformly distributed, metal flow and plastic deformation would be strengthen by increase pass reduction, and the lateral broadening in the head is bigger than that in the tail.

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Simulation of Multipass Hot Rolling for 7050 Aluminum Alloys

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.846.145 ◽

2016 ◽

Vol 846 ◽

pp. 145-150

Author(s):

Yang An ◽

Peter Hodgson ◽

Chun Hui Yang

Keyword(s):

Aluminum Alloys ◽

Microstructure Evolution ◽

Hot Rolling ◽

Subgrain Size ◽

Local Strain ◽

Rolling Process ◽

Hot Rolling Process ◽

Mechanical Evolution ◽

Mechanical Behaviours ◽

Parametric Studies

To determine the relations between rolling passes, mechanical behaviours and microstructure evolution of AA7050 aluminum alloys, finite element modeling of a multipass hot rolling process is developed and employed to investigate thermo-mechanical evolution during this processing. Through parametric studies, the distribution of local strain and temperature across thickness during the hot rolling process are numerically determined. These results are used to determine the subgrain size and thus the microstructure evolution during the hot rolling process are estimated.

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An Investigation of the Effect of Speeds of Work Rolls on Rolling Strip

Journal of Engineering Materials and Technology ◽

10.1115/1.2804549 ◽

1995 ◽

Vol 117 (3) ◽

pp. 341-346 ◽

Cited By ~ 4

Author(s):

Zone-Ching Lin ◽

Y. C. Cheng

Keyword(s):

Hot Rolling ◽

Rolling Force ◽

Large Strain ◽

Work Roll ◽

Rolling Process ◽

Analysis Model ◽

Hot Rolling Process ◽

Rolling Strip ◽

Work Rolls ◽

Thermoelastic Plastic

The paper is an investigation of strip curvature caused by the different speeds between the upper work roll and the lower work roll in the rolling process for an aluminum strip. At the same time, we analyzed the variations in the temperature field and strain field, and used a method of speeds variation of the upper and lower work rolls to calibrate the deformation curvature caused by the coolant condition in the hot rolling process. Based on the large deformation-large strain theory, and by means of the Updated Lagrangean Formulation (ULF) and increment theory, a coupled thermoelastic-plastic analysis model for hot rolling process is thus constructed. At the same time the finite difference method was also used to solve the transient heat transfer equation. Finally, the numerical analysis method developed in this study was employed to analyze the changes in the aluminum strip’s temperature and other changes during rolling. In addition, the average rolling force obtained from the simulation was compared with that from the experiments. It verified that the model in this study is reasonable.

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Load Distribution of Evolutionary Algorithm for Complex-Process Optimization Based on Differential Evolutionary Strategy in Hot Rolling Process

Mathematical Problems in Engineering ◽

10.1155/2013/675381 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Xu Yang ◽

Chang-bin Hu ◽

Kai-xiang Peng ◽

Chao-nan Tong

Keyword(s):

Evolutionary Algorithm ◽

Process Optimization ◽

Hot Rolling ◽

Optimization Model ◽

Load Distribution ◽

Rolling Force ◽

Rolling Process ◽

Evolutionary Strategy ◽

Hot Rolling Process ◽

Complex Process

Based on the hot rolling process, a load distribution optimization model is established, which includes rolling force model, thickness distribution model, and temperature model. The rolling force ratio distribution and good strip shape are integrated as two indicators of objective function in the optimization model. Then, the evolutionary algorithm for complex-process optimization (EACOP) is introduced in the following optimization algorithm. Due to its flexible framework structure on search mechanism, the EACOP is improved within differential evolutionary strategy, for better coverage speed and search efficiency. At last, the experimental and simulation result shows that evolutionary algorithm for complex-process optimization based on differential evolutionary strategy (DEACOP) is the organism including local search and global search. The comparison with experience distribution and EACOP shows that DEACOP is able to use fewer adjustable parameters and more efficient population differential strategy during solution searching; meanwhile it still can get feasible mathematical solution for actual load distribution problems in hot rolling process.

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Hot Rolling Process Simulation: Application to UIC-60 Rail Rolling

Recent Patents on Mechanical Engineering ◽

10.2174/1874477x11003010065 ◽

2010 ◽

Vol 3 (1) ◽

pp. 65-71

Author(s):

Armindo Guerrero ◽

Javier Belzunce ◽

Covadonga Betegon ◽

Julio Jorge ◽

Francisco J. Vigil

Keyword(s):

Hot Rolling ◽

Process Simulation ◽

Rolling Process ◽

Hot Rolling Process

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3D-FEM Simulation of Hot Rolling Process and Characterization of the Resultant Microstructure of a Light-Weight Mn Steel

Crystals ◽

10.3390/cryst11050569 ◽

2021 ◽

Vol 11 (5) ◽

pp. 569

Author(s):

Ana Claudia González-Castillo ◽

José de Jesús Cruz-Rivera ◽

Mitsuo Osvaldo Ramos-Azpeitia ◽

Pedro Garnica-González ◽

Carlos Gamaliel Garay-Reyes ◽

...

Keyword(s):

Hot Rolling ◽

Thermomechanical Processing ◽

Computational Simulation ◽

Effective Strain ◽

Fem Simulation ◽

Rolling Process ◽

3D Fem ◽

Hot Rolling Process ◽

Mn Steel

Computational simulation has become more important in the design of thermomechanical processing since it allows the optimization of associated parameters such as temperature, stresses, strains and phase transformations. This work presents the results of the three-dimensional Finite Element Method (FEM) simulation of the hot rolling process of a medium Mn steel using DEFORM-3D software. Temperature and effective strain distribution in the surface and center of the sheet were analyzed for different rolling passes; also the change in damage factor was evaluated. According to the hot rolling simulation results, experimental hot rolling parameters were established in order to obtain the desired microstructure avoiding the presence of ferrite precipitation during the process. The microstructural characterization of the hot rolled steel was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the phases present in the steel after hot rolling are austenite and α′-martensite. Additionally, to understand the mechanical behavior, tensile tests were performed and concluded that this new steel can be catalogued in the third automotive generation.

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Failure Analysis of a Working Roll Under the Influence of the Stress Field Due to Hot Rolling Process

Journal of Failure Analysis and Prevention ◽

10.1007/s11668-021-01131-9 ◽

2021 ◽

Author(s):

Reza Masoudi Nejad ◽

Peyman Noroozian Rizi ◽

Maedeh Sadat Zoei ◽

Karim Aliakbari ◽

Hossein Ghasemi

Keyword(s):

Stress Field ◽

Failure Analysis ◽

Hot Rolling ◽

Rolling Process ◽

Hot Rolling Process

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Vibration Characteristics of Hot Rolling Mill Rolls Based on Elastoplastic Hysteretic Deformation

Metals ◽

10.3390/met11060869 ◽

2021 ◽

Vol 11 (6) ◽

pp. 869

Author(s):

Rongrong Peng ◽

Xingzhong Zhang ◽

Peiming Shi

Keyword(s):

Hot Rolling ◽

Internal Resonance ◽

Rolling Mill ◽

Rolling Force ◽

Subharmonic Resonance ◽

Force Model ◽

Maximum Lyapunov Exponent ◽

Vibration System ◽

Hot Rolling Mill ◽

Rolling Mill Vibration

Based on the analysis of the influence of roll vibration on the elastoplastic deformation state of a workpiece in a rolling process, a dynamic rolling force model with the hysteresis effect is established. Taking the rolling parameters of a 1780 mm hot rolling mill as an example, we analyzed the hysteresis between the dynamic rolling force and the roll vibration displacement by varying the rolling speed, roll radius, entry thickness, front tension, back tension, and strip width. Under the effect of the dynamic rolling force and considering the nonlinear effect between the backup and work rolls as well as the structural constraints on the rolling mill, a hysteretic nonlinear vertical vibration model of a four-high hot rolling mill was established. The amplitude-frequency equations corresponding to 1/2 subharmonic resonance and 1:1 internal resonance of the rolling mill rolls were obtained using a multi-scale approximation method. The amplitude-frequency characteristics of the rolling mill vibration system with different parameters were studied through a numerical simulation. The parametric stiffness and nonlinear stiffness corresponding to the dynamic rolling force were found to have a significant influence on the amplitude of the subharmonic resonance system, the bending degree of the vibration curve, and the size of the resonance region. Moreover, with the change in the parametric stiffness, the internal resonance exhibited an evident jump phenomenon. Finally, the chaotic characteristics of the rolling mill vibration system were studied, and the dynamic behavior of the vibration system was analyzed and verified using a bifurcation diagram, maximum Lyapunov exponent, phase trajectory, and Poincare section. Our research provides a theoretical reference for eliminating and suppressing the chatter in rolling mills subjected to an elastoplastic hysteresis deformation.

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