Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling

2008 ◽  
pp. 157-160
Author(s):  
H.C. Li ◽  
Zheng Yi Jiang ◽  
Anh Kiet Tieu ◽  
Wei Hua Sun ◽  
He Jie Li ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Work Roll ◽  
Strip Rolling ◽  
Cold Strip Rolling

Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling

2008 ◽  
Vol 32 ◽  
pp. 157-160 ◽  
Author(s):  
H.C. Li ◽  
Zheng Yi Jiang ◽  
A. Kiet Tieu ◽  
Wei Hua Sun ◽  
Hei Jie Li ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Lower Surface ◽  
Work Roll ◽  
Roll Surface ◽  
Strip Rolling ◽  
Wear Process ◽  
Roll Wear ◽  
Work Rolls ◽  
Cold Strip Rolling

The consumption of work rolls in cold strip mills is significant. One of the key issues for work rolls is the surface roughness which affects the rolling stability and surface finish of the strip. The produced strip has lower surface finish if the roll surface roughness is large. However, if the roll surface roughness is small, it is not helpful for establishing the rolling process, which will reduce the productivity. In this case, a laser treatment is employed to increase the value of roll surface roughness. In order to reduce the times of roll grinding, the cold strip mill and roll manufacturers have developed new types of rolls such as the rolls containing Ti to increase the roll wear resistance in cold strip rolling. Results show that the new 4CrTi roll has a significant advantage of preventing decrease of the roll surface roughness. The size and generation of particles during roll wear process and the effect of Ti on roll wear have been discussed.

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.

Work Roll Thermal Deformation Calculation Model of Cold Rolling Mill

2010 ◽  
Vol 145 ◽  
pp. 61-67
Author(s):  
Lei Song ◽  
Jun Sheng Wang ◽  
Min Gang Shen ◽  
Xu Bo Chen ◽  
Sheng Li Li
Keyword(s):  
Temperature Field ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Thermal Deformation ◽  
Work Roll ◽  
Calculation Model ◽  
Cold Rolling Mill ◽  
Strip Rolling ◽  
Roll Temperature ◽  
Cold Strip Rolling

In this article, the factors which have influence on the work roll thermal deformation in cold strip rolling and the heat transferring mechanism are discussed. It is considered that there are three directions, radial, axis and circumference, for heat transferring for work roll thermal deformation. Therefore, it is a three dimensions unstable system for work roll temperature field of cold strip rolling. The plastic deformation work and friction heat are calculated by the divided element and digital integration method. The simplified calculation model is built for the heat transferring along work roll. There are four zones for work roll heat transferring: roll gap zone, air zone, emulsion zone, rolls contact zone. The heat transferring between the zones is decided by the temperature difference. The inter temperature field and thermal deformation of work roll can be calculated by two-dimension finite difference method. The work roll temperature and thermal crown of actual application cold rolling mill are analyzed by the model. By the comparison between calculated values and measured values, the work roll thermal calculation model can meet the accuracy requirement of on-line control.

The Research for Work Roll Thermal Deformation of Cold Rolling Mill with Plastic Materials

2013 ◽  
Vol 661 ◽  
pp. 175-180
Author(s):  
Peng Yu ◽  
Sheng Li Li ◽  
Jun Sheng Wang ◽  
Lei Song
Keyword(s):  
Temperature Field ◽  
Rolling Mill ◽  
Thermal Deformation ◽  
Work Roll ◽  
Calculation Model ◽  
Cold Rolling Mill ◽  
Strip Rolling ◽  
Roll Temperature ◽  
Plastic Materials ◽  
Cold Strip Rolling

In this article, the factors which have influence on the work roll thermal deformation in cold strip rolling and the heat transferring mechanism are discussed. It is considered that there are three direc-tions, radial、axis and circumference, for heat transferring for work roll thermal deformation with plastic materials. Therefore, it is a three dimensions unstable system for work roll temperature field of cold strip rolling. The plastic deformation work and friction heat are calculated by the divided element and digital integration method. The simplified calculation model is built for the heat trans-ferring along work roll. There are four zones for work roll heat transferring: roll gap zone、air zone、emulsion zone、rolls contact zone. The heat transferring between the zones is decided by the temperature difference. The inter temperature field and thermal deformation of work roll can be calculated by two-dimension finite difference method. The work roll temperature and thermal crown of actual application cold rolling mill are analyzed by the model. By the comparison between calculated values and measured values, the work roll thermal calculation model can meet the accu-racy requirement of on-line control.

Hydrodynamic Model for Cold Strip Rolling

1967 ◽  
Vol 182 (1) ◽  
pp. 153-162 ◽  
Author(s):  
D. S. Bedi ◽  
M. J. Hillier
Keyword(s):  
Friction Coefficient ◽  
Film Thickness ◽  
Entropy Production ◽  
Coefficient Of Friction ◽  
Hydrodynamic Model ◽  
Reynolds Equation ◽  
Viscous Friction ◽  
Strip Rolling ◽  
Roll Pressure ◽  
Cold Strip Rolling

The theory of rolling is modified to allow calculation of a hydrodynamic film thickness and viscous friction coefficient using Reynolds equation for the lubricant. Calculations are made for the case where the fluid film covers the arc of contact. The film thickness is assumed uniform and is determined by the principle of minimum rate of entropy production. It is shown that the apparent coefficient of friction varies significantly over the arc of contact. At small reductions the roll load tends to decrease with speed of rolling, while at high reductions the load tends to increase. The point of maximum roll pressure does not coincide with the neutral plane; and under certain rolling conditions there may be no maximum in the pressure over the arc of contact.

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