Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

To analyze plate rolling force, a simple available velocity field is first proposed in this article. Based on the velocity field, the internal deformation energy rate and the friction energy rate are analyzed by the equal perimeter yield criterion and the method of the collinear vector inner product, respectively. Finally, the rolling force accounting for the elastic flattening of the roller and the temperature rise of the rolled piece are ultimately obtained through the minimization of the total energy rate. The theoretical rolling forces are compared with actual measured data, and a good consistency is found since the maximum error between them is less than 4.7%. In addition, the discussion of different rolling conditions, such as friction factor, thickness reduction, and shape factor, upon rolling force, location of neutral angle, and stress state coefficient is also carried out.

show abstract

“…On the roll surface, taking notice of dz=dy = 0 and substituting equations (11) and (12) into equation (10) and integrating, it yields…”

Section: Friction Energy Ratementioning

confidence: 99%

An analytical model of plate rolling force with a simple available velocity field and equal perimeter yield criterion

Wang

Zhu

Zhao

et al. 2017

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The details on the finite-element formulation used to model the mechanical response of the rolled strip will not be reported here for the sake of brevity, but can be found elsewhere. 14,23…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Detailed explanation of the modeling approach for the work-roll can also be found in Koohbor and Serajzadeh 14 and Koohbor. 23…”

Section: Mathematical Modelmentioning

confidence: 99%

See 1 more Smart Citation

Finite-element modeling of thermal aspects in high speed cold strip rolling

Koohbor

Moaven²

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

Self Cite

View full text Add to dashboard Cite

An integrated model based on finite-element method has been proposed to examine the mechanical and thermal responses of strips and work-rolls in tandem and reverse cold rolling operations. The model has been developed such that the influence of various process parameters, such as lubrication, rolling speed, frictional state and back-up rolls, can be examined. Thermal behaviors of the rolled material and the work-rolls have been analyzed using stream-line upwind Petrov–Galerkin approach, in order to make the model applicable to high-speed rolling processes, as well. The results have been compared to the actual on-line measurements and shown to be of acceptable accuracy. Such modeling approach can be considered as a useful means, providing a detailed insight on the thermo-mechanical response of strips, as well as work-rolls, during high-speed cold rolling of steel strips. Additionally, special attention has been drawn towards the prediction of the occurrence of the metallurgical phenomenon dynamic strain aging based on the results obtained from the numerical modeling in this work.

show abstract

“…Thermal and mechanical stresses produced in the work rolls during the hot rolling process are predicted using a thermoplastic finite element approach in the ABAQUS standard software by Qayym et al [29], comparing with a cold rolling case. An integrated mathematical model was developed to study the thermo-mechanical behavior of strips and work rolls during the warm rolling process of steels by Koohbor [30]. With regard to HSS rolls, Gao et al [31] studied temperature variations and compared them with the results from a high-Cr roll using the FEM model.…”

Section: Introductionmentioning

confidence: 99%

On the Evolution of Temperature and Combined Stress in a Work Roll under Cyclic Thermo-Mechanical Loadings during Hot Strip Rolling and Idling

Shi

Han

et al. 2020

Materials

View full text Add to dashboard Cite

An accurate prediction of temperature and stress evolution in work rolls is crucial to assess the service life of the work roll. In this paper, a finite element method (FEM) model with a deformable work roll and a meshed, rigid body considering complex thermal boundary conditions over the roll surface is proposed to assess the temperature and the thermal stress in work rolls during hot rolling and subsequent idling. After that, work rolls affected by the combined action of temperature gradient and rolling pressure are investigated by taking account of the hot strip. The accuracy of the proposed model is verified through comparison with the calculation results obtained from the mathematical model. The results show that thermal stress is dominant in the bite region of work rolls during hot rolling. Afterwards, the heat treatment residual stresses which are related to thermal fatigue are simulated and introduced into the work roll as the initial stress to evaluate the redistribution under the thermal cyclic loads during the hot rolling process. Results show that the residual stress significantly changed near the roll surface.

show abstract

Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

Cited by 9 publications

References 31 publications

An analytical model of plate rolling force with a simple available velocity field and equal perimeter yield criterion

An analytical model of plate rolling force with a simple available velocity field and equal perimeter yield criterion

Finite-element modeling of thermal aspects in high speed cold strip rolling

On the Evolution of Temperature and Combined Stress in a Work Roll under Cyclic Thermo-Mechanical Loadings during Hot Strip Rolling and Idling

Contact Info

Product

Resources

About