A Visual Detection Method of Longitudinal Crack Based on Computer Image Processing During Slab Continuous Casting

• Autorzy: Liu Y. , Wang X. , Sun Y. , Du F. , Gao Y. , Wang F. , Wang J.

Identyfikatory

DOI

10.24425/122393

• Języki publikacji: EN

Abstrakty

EN

Based on the mould temperature measured by thermocouples during slab continuous casting, a difference of temperature thermograph is developed to detect slab cracks. In order to detect abnormal temperature region caused by longitudinal crack, the suspicious regions are extracted and divided by virtue of computer image processing algorithms, such as threshold segmentation, connected region judgement and boundary tracing. The abnormal regions are then determined and labeled with the eight connected component labeling algorithm. The boundary of abnormal region is also extracted to depict characteristics of longitudinal crack. Based on above researches, longitudinal crack with abnormal temperature region can be detected and is different from other abnormalities. Four samples of temperature drop are picked up to compare with longitudinal crack on the abnormal region formation, length, width, shape, et al. The results show that the abnormal region caused by longitudinal crack has a linear and vertical shape. The height of abnormal region is more than the width obviously. The ratio of height to width is usually larger than that of other temperature drop regions. This method provides a visual and easy way to detect longitudinal crack and other abnormities. Meanwhile it has a positive meaning to the intelligent and visual mould monitoring system of continuous casting.

Słowa kluczowe

EN

longitudinal crack; visual detection; image processing; continuous casting

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2018
• Tom: Vol. 63, iss. 2
• Strony: 673--680
• Opis fizyczny: Bibliogr. 19 poz., rys., wzory

Twórcy

autor

Liu Y.

• Northeast Electric Power University, School of Mechanical Engineering No. 169 Changchun Road, Chuanying District, Jilin, Cn 132012
• Dalian University of Technology, School of Information and Communication Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian, CN 116024

autor

Wang X.

• Dalian University of Technology, School of Materials Science and Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian, CN 116024

autor

Sun Y.

• Dalian University of Technology, School of Information and Communication Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian, CN 116024

autor

Du F.

• Dalian University of Technology, School of Materials Science and Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian, CN 116024

autor

Gao Y.

• Northeast Electric Power University, School of Mechanical Engineering No. 169 Changchun Road, Chuanying District, Jilin, Cn 132012

autor

Wang F.

• Northeast Electric Power University, School of Mechanical Engineering No. 169 Changchun Road, Chuanying District, Jilin, Cn 132012

autor

Wang J.

• Northeast Electric Power University, School of Mechanical Engineering No. 169 Changchun Road, Chuanying District, Jilin, Cn 132012

Bibliografia

• [1] J. Konishi, M. Militzer, I.V. Samarasekera, J.K. Brimacombe, Modeling the formation of longitudinal facial cracks during continuous casting of hypoperitectic steel, Metallurgical and Materials Transactions B 33, 413-423 (2002).
• [2] K. Schwerdtfeger, K.H. Spitzer, Application of reduction of area-temperature diagrams to the prediction of surface crack formation in continuous casting of steel, ISIJ International 49, 512-520 (2009).
• [3] O. B. Isaev, V. V. Emelyanov, V. V. Kislitsa, Y. I. Matrosov, L. S. Lepikhov, Effect of the carbon content of low-alloy steels on the surface quality of continuous-cast semifinished products and rolled plates, Metallurgist 48, 210-213 (2004).
• [4] B. Hadala, A. Cebo-Rudnicka, Z. Malinowski, A. Goldasz, The influence of thermal stress and strand bending on surface defects formation in continuous cast strands, Archives of Metallurgy and Materials 56, 367-377 (2011).
• [5] H. L. Yu, X. H. Liu, Longitudinal crack on slab surface at straightening stage during continuous casting using finite element method, Journal of Central South University of Technology 17, 235-238 (2010).
• [6] J. K. Park, I. V. Samarasekera, B. G. Thomas, U. S. Yoon, Thermal and mechanical behavior of copper molds during thin-slab casting (II): Mold crack formation, Metallurgical and Materials Transactions B 33, 437-449 (2002).
• [7] Y. Kanbe, T. Ishii, H. Todoroki, K. Mizuno, Prevention of longitudinal cracks in a continuously cast slab of Fe-Cr-Ni superalloy containing Al and Ti, International Journal of Cast Metals Research 22, 143-146 (2009).
• [8] J. K. Brimacombe, K. Sorimachi, Crack formation in the continuous casting of steel, Metallurgical Transactions B 8, 489-505 (1977).
• [9] M. Kawamoto, Y. Tsukaguchi, N. Nishida, T. Kanazawa, S. Hiraki, Improvement of the initial stage of solidification by using mild cooling mold powder, ISIJ International 37, 134-139 (1997).
• [10] S. Sridhar, K. C. Mills, S. T. Mallaband, Powder consumption and melting rates of continuous casting fluxes, Ironmaking & Steelmaking 29, 194-198 (2002).
• [11] X. Yu, G. H. Wen, P. Tang, H. Wang, Investigation on viscosity of mould fluxes during continuous casting of aluminium containing TRIP steels, Ironmaking & Steelmaking 36, 623-630 (2009).
• [12] R. B. Mahapatra, J. K. Brimacombe, I. V. Samarasekera, Mould behavior and its influence on quality in the continuous casting of steel slabs: Part II. Mould heat transfer, Mould heat transfer, Mould Flux Behavior, Formation of Oscillation Marks, Longitudinal off-corner depressions, and subsurface cracks, Metallurgical Transactions B 22, 875-888 (1991).
• [13] L. Zhang, G. D. Xu, X. H. Wang, Z. Y. Zhu, Investigation on Longitudianal surface cracks of CC slabs for container, Iron and Steel 37, 19-25 (2002).
• [14] J. Watzinger, A. Pesek, N. Huebner, M. Pillwax, O. Lang, MoldExpert-operational experience and future development, Ironmaking & Steelmaking 32, 208-212 (2005).
• [15] F. He, D. F. He, A. J. Xu, H. B. Wang, N. Y. Tian, S. Chang, G. Bu, A method for plotting the on-line thermal map of a continuous casting mould, Journal of University of Science and Technology Beijing 36, 952-958 (2014).
• [16] Y. Y. Zhai, Z. G. Ao, Thermal imaging analysis of the prediction of breakout in continuous casting, Control Engineer of China 22, 1251-1254 (2015).
• [17] L. C. Hibbeler, B. G. Thomas, B. Santillana, A. Hamoen, A. Kamperman, Longitudinal face crack prediction with thermo-mechanical models of thin slabs in funnel moulds, Metall. Ital. 6, 1-10 (2009).
• [18] G. O. Tirian, I. Filip, G. Prostean, Adaptive control system for continuous steel casting based on neural networks and fuzzy logic, Neurocomputing 125, 236-245 (2014).
• [19] K. Xu, C. L. Yang, P. Zhou, C. Yang, X. G. Li, On-line detection technique of surface cracks for continuous casting slabs based on linear lasers, Journal of University of Science and Technology Beijing 32, 1620-1624 (2009).

Uwagi

EN

We would like to acknowledge financial support from the National Natural Science Foundation of China (51704073/51004012/51505077), Science and Technology Development of Jilin Province (20180520065JH /20170520099JH), “13th Five-Year Plan” Science and Technology Research Project of Jilin Provincial Education Department (JJKH20180419KJ), and Technology Innovation Development Project of Jilin City (20166013). This project was also given financial support by the China Postdoctoral Science Foundation (2013T60511/2017M611209), the Fundamental Research Funds for the Central Universities (3132017009), Natural Science Foundation of Liaoning Province (20170540083), and Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province).

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).