Study on the Shape Target Curve Setting Model for Cold Rolling Strip

2014 ◽  
Vol 1049-1050 ◽  
pp. 916-919
Author(s):  
Zhang Xian Zhao ◽  
Dong Cheng Wang ◽  
Hong Min Liu
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Main Idea ◽  
Forecast Model ◽  
Rolling Process ◽  
Deformation Model ◽  
Shape Discrimination ◽  
Good Shape ◽  
Rolling Strip ◽  
Calculation Results

In order to automatically set the shape target curve, a model based on shape control theory is put forward. By coupling the shape forecast model and the shape discrimination model, the practical and strict shape target curve is researched. By combining strip plastic deformation model and rolls elastic deformation model, the shape forecast model is built. The shape discrimination is based on the strip element method. The main idea of the shape target curve is to minimize the shape crown in the first few passes on the condition that the strip is not unstable, in the last two passes to keep the good shape under the natural shape crown. Taking five-pass six-high rolling mill as an example, the convex strip is analyzed. The simulation and calculation results prove the validity and feasible of the shape target curve setting model. This model develops the shape target theory and lays the foundation of application of shape target curve in the rolling process of cold rolling.

Research on Shape Detecting System of Cold Rolling Strip

2011 ◽  
Vol 697-698 ◽  
pp. 525-528
Author(s):  
Li Po Yang ◽  
Bing Qiang Yu
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Shape Control ◽  
Shape Index ◽  
Cold Rolling Mill ◽  
Cold Rolling Strip ◽  
Rolling Strip ◽  
Quality Stability ◽  
Loop Shape ◽  
Shape Detecting

Comprehensive considered actual working conditions of cold rolling mill, a high precision shape detecting system of cold rolling strip was developed to meet industrial application. Consideration to both follow-up processing technology requirements, dynamic flatness standard curves could be formulated according to different rolling conditions and product specifications, and reliable shape datum were provided for close-loop shape control. This system was successfully used in Angang 1250 mm HC 6-high reversible cold rolling mill. Then the shape index and the quality stability of cold rolling strip were increased significantly, the errors between the calculated values and measured values of the total tension were less than 3%, the precision of shape detecting is 0.2 I and shape indices was within 6 I after the close-loop shape control was input.

Asymmetric Shape Control Theory and Practice in Cold Strip Mills

2010 ◽  
Vol 145 ◽  
pp. 204-209 ◽  
Author(s):  
Xiao Chen Wang ◽  
Zhi Guo Liang ◽  
Quan Yang ◽  
Xiao Zhong Du ◽  
Hua Qiang Liu ◽  
...  
Keyword(s):  
Control Theory ◽  
Cold Rolling ◽  
Shape Control ◽  
Simulation Models ◽  
Rolling Process ◽  
Theory And Practice ◽  
Three Dimension ◽  
Control Effect ◽  
Asymmetric Shape ◽  
Roll System

In cold rolling process, asymmetric shape defects are still a common problem to strip quality. For the mills with inverse symmetry roll shifting system, different roll wear and thermal contour of top roll system and bottom roll system could cause asymmetric shape defects during shifting operation. In this paper, three dimension finite element simulation models of inverse shifting roll system were established to calculate the parameters and to analyze the effects. Based on the idea in the mill engineering that mill style option depended on the product grade, shifting weakness was evaluated and the opinion of limit shifting was suggested. To improve control effect to asymmetric shape defects in cold rolling, shape control system with asymmetric shape control ability is developed, including asymmetric edge drop control at upstream stands and asymmetric flatness control at last stand. The further improvement of asymmetric shape control theory and practice is the key way to reach the higher precision of shape quality in cold strip mills.

scholarly journals Analysis of Thin Strip Profile during Asymmetrical Cold Rolling with Roll Crossing and Shifting Mill

2014 ◽  
Vol 894 ◽  
pp. 212-216 ◽  
Author(s):  
Abdulrahman Aljabri ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Work Roll ◽  
Rolling Process ◽  
Thin Strip ◽  
Asymmetrical Rolling ◽  
Strip Shape ◽  
Strip Profile ◽  
Profile Control ◽  
The One

Strip profile control during rolling is required to assure the dimensional quality of rolled thin strip is acceptable for customers. Throughout rolling, the strip profile is controlled by using the advanced shape control rolling mill, such as the combination of work roll crossing and shifting during asymmetrical rolling, the one of the valuable methods to control the strip profile quality in rolling process. In this paper, the influences of cold rolling parameters such as the crossing angle and axial shifting value of work rolls on the strip profile are analysed. The strip shape control is discussed under both symmetrical and asymmetrical rolling conditions. The obtained results are appropriate to control the rolled thin strip profile in practice.

Shape Detecting and Shape Control of Cold Rolling Strip

2011 ◽  
Vol 311-313 ◽  
pp. 902-905 ◽  
Author(s):  
Li Po Yang ◽  
Bing Qiang Yu
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Shape Control ◽  
Digital Signal ◽  
Cold Rolling Mill ◽  
Shape Deviation ◽  
Cold Rolling Strip ◽  
Rolling Strip ◽  
Loop Shape ◽  
Shape Detecting

Based on the shape detecting principle and the DSP (Digital Signal Processing) technology, a high-precision shape detecting system of cold rolling strip is developed to meet industrial application. It was successfully used in Angang 1250 mm HC 6-high reversible cold rolling mill. The precision of shape detecting was 0.2 I, the shape deviation was controlled within 6 I after the close loop shape control was input.

Study on Convergence, Calculation Speed and Precision of Flatness Analysis Method for Cold Rolling Strip

2014 ◽  
Vol 941-944 ◽  
pp. 1792-1796
Author(s):  
Dong Cheng Wang ◽  
Zhu Qing Zhang ◽  
Hong Min Liu
Keyword(s):  
Plastic Deformation ◽  
Cold Rolling ◽  
Traditional Method ◽  
Rolling Force ◽  
Coupling Method ◽  
Model Coupling ◽  
Deformation Model ◽  
Analysis Method ◽  
Internal Relation ◽  
Rolling Strip

The key models of flatness analysis method are the strip plastic deformation model (SPDM) and the roll stack elastic deformation model (REDM). The traditional method uses the SPDM to calculate the distribution of rolling force, and the REDM is adopted to calculate the profile of exit strip. The reverse iteration method uses the REDM to calculate the distribution of rolling force, while the SPDM is adopted to calculate the profile of exit strip. The model coupling method integrates SPDM and REDM as one set equations through their internal relation. In this paper, the basic thoughts of three methods are introduced. Through a typical example, the convergence, calculation speed and precision of three different methods are analyzed. It is found that the calculation precision of the three methods are almost the same, but the model coupling method is more outstanding than other two methods on the convergence and calculation speed, so the model coupling method is the best choice for flatness analysis.

Research on Shape Signal Smoothing Processing of Cold Rolling Strip

2013 ◽  
Vol 364 ◽  
pp. 314-318
Author(s):  
Li Po Yang ◽  
Bing Qiang Yu
Keyword(s):  
Cold Rolling ◽  
Shape Control ◽  
Signal Loss ◽  
Cold Rolling Strip ◽  
Rolling Strip ◽  
Signal Error ◽  
Slope Compensation ◽  
The Stability ◽  
Measuring Signal

In the process of measuring the shape of the cold rolling strip, by combining proportion compensation with slope compensation, the signal error of edge shape should be compensated reasonably. In addition, corresponding solutions are proposed to solve the channel signal loss or the discontinuous transverse shape value which takes place occasionally in the shape measuring roller. These solutions could improve the stability of shape measuring signal, avoid serious accidents of controlling mill caused by abnormal shape signals and achieve reliable shape control without worries

New Industrial Shape Detecting Equipment of Cold Strip

2013 ◽  
Vol 313-314 ◽  
pp. 677-680
Author(s):  
Bing Qiang Yu ◽  
Li Po Yang
Keyword(s):  
Signal Processing ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Shape Control ◽  
Control Model ◽  
Cold Rolling Mill ◽  
Rolling Strip ◽  
Shape Detecting

Shape has a significant impact on the good quality of follow-up deep-processed steel products. But it is difficult to detect, so a shape detecting equipment of cold rolling strip is developed to meet industrial application, which mainly consist of the shape detecting roller, the collecting ring, the DSP shape signal processing board and the shape control model. The shape detecting system was successfully used in 1250 mm HC 6-high reversible cold rolling mill. The precision of shape detecting is 0.2 I.

Estimated Roll Bite Temperatures Encountered in Cold Rolling, and Their Effect in Rolling

1967 ◽  
Vol 89 (3) ◽  
pp. 471-476 ◽  
Author(s):  
H. Inhaber
Keyword(s):  
Cold Rolling ◽  
Strain Rate ◽  
Rolling Mill ◽  
Mathematical Formulation ◽  
Rolling Process ◽  
Cold Rolling Strip ◽  
Rolling Strip ◽  
Roll Bite

In modern cold rolling, strip exit velocities of the order of thousands of feet per minute are employed. Even if only moderate reductions of the strip are performed, large amounts of heat are generated due to deformation and friction. This work presents a mathematical formulation of the problem of the temperature in the roll bite as strain rate is varied (due to Cerni), as well as some calculated examples using a typical small rolling mill. The possible influence of the temperature generated on the rolling process is also considered.

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