Numerical and Experimental Investigation of Friction in Cold Strip Rolling

2005 ◽  
Author(s):  
Cheng Lu ◽  
A. Kiet Tieu
Keyword(s):  
Experimental Investigation ◽  
Tangential Force ◽  
Frictional Coefficient ◽  
Rolling Process ◽  
Deformation Model ◽  
Strip Rolling ◽  
The Coefficient Of Friction ◽  
Contact Mechanism ◽  
Cold Strip Rolling ◽  
Good Agreement

To obtain a better understanding of friction and contact mechanism in cold strip rolling, a refined asperity ploughing model and an asperity elastic deformation model have been developed. It is found that the asperity angles α1 and α2 significantly affect the tangential force and the coefficient of friction respectively. The theoretical prediction is in good agreement with the experimental results in Ref. [7]. The developed models can predict a reasonable frictional coefficient if it is applied to the cold rolling process.

Study on Surface Roughness Muring Metal Manufacturing Process

2011 ◽  
Vol 325 ◽  
pp. 731-736
Author(s):  
Zheng Yi Jiang ◽  
Shu Jun Wang ◽  
Dong Bin Wei ◽  
Hei Jie Li ◽  
Hai Bo Xie ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Crack Nucleation ◽  
Metal Plate ◽  
Experimental Result ◽  
Strip Rolling ◽  
Surface Asperity ◽  
Asperity Flattening ◽  
Cold Strip Rolling ◽  
Effect Of Surface ◽  
Good Agreement

In the paper, a crystal plasticity finite element method (CPFEM) model was developed based on ABAQUS to analyse the surface roughness transfer during metal manufacturing. The simulation result shows a good agreement with the experimental result in the flattening of surface asperity, and the surface roughness decreases significantly with an increase of reduction with considering friction effect. Lubrication can delay surface asperity flattening. The effect of surface roughness on produced metal defect (crack) was also studied, and the surface roughness affects the crack initiation significantly in cold strip rolling. In addition, the surface roughness variation along the metal plate width contributes to stress distribution and then inhibition of crack nucleation.

Rigid Plastic FEM Model of Fast Solution to Strip Rolling

2011 ◽  
Vol 704-705 ◽  
pp. 358-363
Author(s):  
Rui Bin Mei ◽  
Chang Sheng Li ◽  
Xiang Hua Liu ◽  
Li Bao
Keyword(s):  
Rolling Force ◽  
Rolling Process ◽  
Computational Time ◽  
Rolling Schedule ◽  
Strip Rolling ◽  
Rigid Plastic ◽  
Fem Model ◽  
Online Application ◽  
Fast Solution ◽  
Good Agreement

Rigid plastic finite element method (RPFEM) is one of the most efficient numerical methods during the rolling process. Realizing FEM online application has been main target for many researchers. The influence of compile method, elements number, compressible parameter, friction factor and convergent criteria were investigated and RPFEM model of fast solution to strip rolling was proposed in this work. Compile method and compressible parameter have less influence on calculated rolling force. However, the iteration steps are reduced and computational efficiency is improved greatly with compile method of release and compressible parameter 0.01. The change of calculated rolling force becomes less but iteration steps become more and more with the increment of elements number. Both accuracy and efficiency is satisfying with the change of elements number from 50 to 200. In addition, the typical rolling schedule from a certain plant has been solved with the developed program FFEM-2D by FORTRAN. The predicted rolling force has a good agreement with the measured value. The iteration steps change from 12 to 36 and computational time is less than 200(ms) with the model in one pass rolling. Therefore, the accuracy is satisfying and computational time fully meets the basic requirements of FEM online application. Keywords: Rolling; RPFEM; Fast solution; Computational time

Power Analysis of Cold Strip Rolling

1963 ◽  
Vol 85 (1) ◽  
pp. 77-88 ◽  
Author(s):  
B. Avitzur
Keyword(s):  
Coefficient Of Friction ◽  
Power Analysis ◽  
Simple Procedure ◽  
Simple Expression ◽  
Optimum Conditions ◽  
Strip Rolling ◽  
The Coefficient Of Friction ◽  
Separation Force ◽  
Cold Strip Rolling

In a previous paper criteria for maximum possible reduction were developed. A simple procedure for the experimental determination of the coefficient of friction was introduced. In this paper a solution for the efficiency is presented. A term called “Minimum Required Reduction,” which was briefly mentioned earlier [2], is discussed in detail. The results of experimental work for the determination of the coefficient of friction are described. A simple expression for the separation force is given. Finally, a procedure for optimum operation is suggested. The controllable variables are pointed out and the steps in the choice of the optimum conditions are described.

scholarly journals Experimental Study of Interfacial Heat Flux and Surface Temperature by Inverse Analysis with Thermocouple (Fully Embedded) during Hot Steel Strip Rolling

2012 ◽  
Vol 452-453 ◽  
pp. 959-963 ◽  
Author(s):  
Daniel Weisz-Patrault ◽  
Alain Ehrlacher ◽  
Nicolas Legrand ◽  
Nathalie Labbe ◽  
Jaroslav Horský ◽  
...  
Keyword(s):  
Heat Flux ◽  
Surface Temperature ◽  
Steel Strip ◽  
Theoretical Models ◽  
Calibration Procedure ◽  
Rolling Process ◽  
Fundamental Aspect ◽  
Strip Rolling ◽  
Interfacial Heat Flux ◽  
Good Agreement

Knowledge of temperature distribution in the roll is fundamental aspect in cold rolling. An inverse analytical method has been previously developed to determine interfacial heat flux and surface temperature by measuring the temperature with a thermocouple (fully embedded) at only one point inside the roll. On this basis some pilot mill tests have been performed. The temperature sensor, the calibration procedure and rolling tests at different strip rolling conditions (5%, 10%, 15% and 20%) are described. Results show a good agreement with well-known theoretical models. Moreover the CPU times of the method (around 0.05 s by cycle) enable an online control of the rolling process.

scholarly journals A mixed lubrication model of the cold strip rolling process

2001 ◽  
Vol 98 (5) ◽  
pp. 423-433 ◽  
Author(s):  
P. Montmitonnet ◽  
N. Marsault ◽  
P. Deneuville ◽  
P. Gratacos
Keyword(s):  
Rolling Process ◽  
Mixed Lubrication ◽  
Strip Rolling ◽  
Cold Strip Rolling

Simulation of Thermal Phenomena in Reverse Strip-Rolling Process

2018 ◽  
Vol 941 ◽  
pp. 1424-1430
Author(s):  
Alexander Nam ◽  
Uwe Prüfert ◽  
Marciej Pietrzyk ◽  
Rudolf Kawalla ◽  
Ulrich Prahl
Keyword(s):  
Hot Rolling ◽  
Rolling Process ◽  
Temperature Model ◽  
Hot Strip Rolling ◽  
Forming Process ◽  
Strip Rolling ◽  
Unknown Parameters ◽  
Hot Strip ◽  
Thermal Phenomena ◽  
Good Agreement

In the reverse hot strip rolling, the coiling and uncoiling of the strip leads to unstable conditions during the forming process. Both the temperature of the strip and the dwell time in the coil vary and influence the microstructure evolution passing in the coil during reverse rolling. It makes the design of this process difficult. Therefore, development of the temperature model for the reverse hot rolling including coiling and uncoiling was the main objective of the paper. The identification of the unknown parameters of the boundary conditions is proposed. Methods for their determination are discussed. The analysis is performed on example of the reverse hot rolling of the magnesium alloy AZ31. The resulting temperature model reveals good agreement with thermocouple and pyrometer measurements.

Modeling and Optimization of Rolling Process: A Multi-Objective Approach

2020 ◽  
Vol 19 (02) ◽  
pp. 343-364
Author(s):  
S. Panda ◽  
S. N. Panda
Keyword(s):  
Cold Rolling ◽  
Film Thickness ◽  
Temperature Rise ◽  
High Speed ◽  
Rolling Process ◽  
Response Analysis ◽  
Strip Rolling ◽  
Multi Objective ◽  
Inlet Zone ◽  
Cold Strip Rolling

In a high-speed cold strip rolling process, it is necessary to optimize the process parameters for improved quality in the product. In this study, two separate multi-objective optimization problems for a cold rolling process are formulated. The objectives in one of the cases are minimum isothermal film thickness and film temperature rise in the inlet zone and in another case it is minimum thermal film thickness and film temperature rise in the inlet zone. Particle swarm optimization algorithm has been used for solving the optimization problem. The key input parameters for the cold rolling process are identified and prioritized through the convergence study and the coefficient of variation analysis. A response analysis is performed on the critical input variables. This study assists the process engineer to understand the lubrication in cold strip rolling at high speed and select an appropriate lubricant for a given combination of strip and rolls.

The Influence of Work Roller Diameter on Shape of Strip in Stainless Steel Cold Strip Rolling Process with Numerical Simulation Method

2012 ◽  
Vol 538-541 ◽  
pp. 646-650
Author(s):  
Li Li Dong ◽  
Shu Qing Xing ◽  
Yong Lin Ma
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Simulation Method ◽  
Rolling Process ◽  
Strip Rolling ◽  
Roller Diameter ◽  
Numerical Simulation Method ◽  
The Waves ◽  
Cold Strip Rolling

In order to study the effects of work roller diameter on shape of strip in cold strip rolling process, the ANSYS/LS-DYNA software was employed to simulate rolling process of 2mm thickness stainless steel. It is found that the average of stress decrease along with the increasing diameter of the work roller.But this variation is about 1%.The stressstrain curve go more steady and the shape of strip become better along with the decreasing of the work roller diameter. In this paper the three kinds of rolling process will produce tiny waves edge. The waves edge was the most obvious when the work roller diameter is 60mm.

scholarly journals Mathematical Modeling of the Cold Rolling Process and Heat Treatment for DC01 Steel

2021 ◽  
Vol 44 (2) ◽  
pp. 35-38
Author(s):  
Marian-Iulian NEACȘU
Keyword(s):  
Mechanical Properties ◽  
Mathematical Model ◽  
Steel Strip ◽  
Rolling Process ◽  
Recrystallization Annealing ◽  
Strip Rolling ◽  
Active Experiment ◽  
Cold Rolled ◽  
Cold Strip Rolling ◽  
Rolled Tape

The paper presents the elaboration of a mathematical model of the cold strip rolling process combined with the recrystallization annealing after the rolling at LBR Liberty Galati.The elaborated mathematical model allows the prediction of the mechanical properties of cold rolled strips subsequently subjected to a heat treatment.The realization of this mathematical model was based on statistical measurements of the mechanical properties Rm, Rp0.2 (Rc) and A5 for the rolled steel strip DC01 from Liberty Steel Galati. To achieve this mathematical model, the active experiment method was used.With the help of this mathematical model, it is possible to optimize the rolling process by significant savings of time and materials in the process of testing the mechanical properties for cold rolled tape, but also by choosing the most appropriate process parameters.

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