Papers by Author: Xiao Chen Wang

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Authors: Xiao Chen Wang, Zhi Guo Liang, Quan Yang, Xiao Zhong Du, Hua Qiang Liu, Yun Zhang
Abstract: 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.
Authors: Shuang Liu, Xiao Chen Wang, Quan Yang, You Zhao Sun
Abstract: This paper introduces the revamp of 1000mm cold rolling mills. For problems of low productivity and poor stability, a revamp of automatic gauge control (AGC) system and automatic tension control (ATC) system was taken. After the revamp, precision of gauge control and stability of tension control increase and the rate of malfunction was decreased obviously. The problems of former system are solved and the new system runs well.
Authors: Fei He, Xiao Chen Wang, Zhi Guo Liang, Cui Ma
Abstract: In the hot strip rolling production process, mechanical properties are detected offline. The process data is used for clustering analysis to acquire the state in advance. During the mechanical properties detection, the outliers in the same steel grade are regarded as the focal points. Spectral clustering is one of the advanced methods, where the Euclidean distance as the common similarity measure, can only extract the features of the spherically distribution data and can not express the complex distribution data. In this paper geodesic distance is introduced to spectral clustering, which is used to do the production state clustering. The Tennessee Eastman and hot strip rolling process data are used for model validation, as a result the proposed method has better performance on clustering, compared with the Euclidean distance.
Authors: Xiao Zhong Du, Quan Yang, Bin Yu Sun, Xiao Ping Zhang, Xiao Chen Wang
Abstract: Bar straightening is an important work before the bar is applied as qualified products. In this paper, the mechanics of the straightening process is analyzed in detail on the base of conjugate quadric theory. A simulation program is developed with the investigation of straightening process as well. The equations, which describe roll contour curve and the longitudinal section, are given and simulated in computer. And a brief method of designing and drawing the straightening roll contour curve is introduced.
Authors: Xiao Zhong Du, Quan Yang, Qing Xue Huang, Xiao Chen Wang
Abstract: The three dimensional deformation of strip during flat rolling is always a key issue, the lateral flow of metal on the strip edge will determines the quality of final product. In this paper, a theoretical analysis focus on the lateral flow of strip edge is discussed. Lateral Flow Factor and Relative Lateral Flow Factor are developed originally to analyze the lateral flow of strip and edge drop. For special process condition mentioned in paper, value of lateral flow factor is about 0.07.
Authors: Yan Jie Zhang, Xiao Chen Wang, Quan Yang, Ren Jie Xue, An Min Yin
Abstract: TWIP steel has the characteristics of high elongation and high tensile strength at room temperature, and therefore it is widely used in the automobile manufacturing industry. Since the grain size has a very important influence on its mechanical properties and corrosion resistance it is significant to study the average grain size of TWIP steel. In this experiment, the specimens were heated to 700~1000°C and preserved for one hour, and the recrystallized structures with different average grain sizes were obtained. All the samples were tested by laser ultrasonic experimental platform and the standard sample was selected. Then the attenuation coefficients of remaining samples were compared with the standard samples by conventional methods. The results showed that the larger the difference between the average grain size of the test sample and the standard sample is, the greater the error of the test will be. The new evaluation model was established by the improved method, and the prediction error was reduced to 5.44~11.61%, which proved the effectiveness of the new method. In addition, laser ultrasonic testing has the advantages of high efficiency and no damage compared with traditional methods.
Authors: An Min Yin, Quan Yang, Xiao Chen Wang, Fei He, You Zhao Sun
Abstract: This paper described the application of a diffraction system based on X-ray area detector on pole figure measurement as well as corresponding computation of orientation distribution functions and the principle of rapid measurement texture. The impact of calculates the orientation distribution function on the conditions of the two-dimensional X-ray diffraction was analyzed; this was illustrated by an example of deep drawing steel sheets texture measurement. ̙̈́˰͇̱̓˰̶̴̿̾ͅ˰̸̱̈́̈́˰̷̱̹͂̿̈́̈́̾˰̸̵̈́˰͇̈́̿˽̴̵̹̹̱̼̽̾̓̿̾˰̴̵̵̳̈́̈́̿͂˰̈́̿˰̸̵̈́˰̵̱̹̱̀̀͂̿̀͂̈́˰̂θ position then fix it, reduce the sample rotation; the texture determination time can be significantly reduced. Reduce the Measuring range of angle χ˰̴̱̾ φ˰̴̵̿̓˰̾̿̈́˰̶̶̵̱̳̈́˰̸̵̈́ calculation of orientation distribution function, it also can significantly reduce the measurement of diffraction data. Several technical problems appeared on the on-line determination of texture based on an X-ray two-dimensional detector system and the possibility to improve the measurement speed and accuracy in the industrial production applications were then discussed.
Authors: Hai Yu Wang, Quan Yang, Xiao Chen Wang, Yan Zhang, De Fu Guo
Abstract: Spring model is important restrictive factors to improve the precision of AGC control system. To improve the accuracy of strip gauge control, Study on various influencing factors of spring model has important significance in rolling process. Therefore, using ABAQUS finite element software, this paper establishes the whole stand model of strip rolling. The model is used to analyze variation factors of the strip width and bending force to impact the longitudinal stiffness of rolling mill and get calculation model of the longitudinal stiffness of rolling mill. Then, this paper considers influence of the roller thermal expansion and wear factors influence on spring model and establish compensation model. The corrected spring model was applied to 1780mm hot strip mill in a factory in China, taking 45 strip head samples for measurement, with the model error under 50µm.
Authors: Xiao Chen Wang, Quan Yang, Zhi Guo Liang, Fei He
Abstract: Towards the insufficiency of the research on asymmetric shape defects control, and the equipment of new asymmetric shape control device—inverse symmetric roll bending for UCM cold mill, in this paper, by ANSYS finite element simulation, high-precision rolls-strip coupling models were established, and the difference of control character among all the symmetric and asymmetric shape control methods were analyzed, then generalized overall shape setting control models with asymmetric shape control function was proposed. It was proved by field application that the control models can effectively control asymmetric and high-order shape defects with the coordination of all the symmetric and asymmetric shape control methods. Consequently, expansive research and apply prospect should be expected.
Authors: Xiao Chen Wang, Ze Wei Mao, Quan Yang
Abstract: This paper expatiated on principles of high pressure abrasive water jet descaling; used GAMBIT and some experience parameters to create the geometry model of the nozzles and the outflow field; used Fluent to simulate the high pressure abrasive water jet under the condition of different jet standoff distance, different impact angle, different mix angle, different abrasive particle size, different abrasive concentration and different abrasive material. Through the analysis of the simulation results, this paper put forward the optimal selection of these parameters.
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