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HomeEnhanced coating thickness control in hot dip galvanising
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The overall objective of the present research is to enhance the control of the coating thickness in hot dip coating lines. The improvement of the thickness control is approached by complementary ways : - correction of the cross-bow defect of the strip passing in front of the nozzles of the wiping device by, for example, an online control system acting on the guide rolls' position in the zinc pot (CRM, IRSID) ; - reduction of the dynamic effects by development of an air floating technology and by process procedures including better control concepts of the cooling and the drive systems versus the process parameters (BFI, CRM, IRSID) ; - online trials of a new air knife geometry (Aceralia). The expected returns are a decrease in the production costs and higher product quality. During the research, works have progressed in the direction of the research objectives with the following results : - installation and large-scale trials of an optical sensing head in an industrial galvanising line to measure the strip shape just after wiping ; - completion and industrial validation of the cross-bow formation model. Based on the results, it is possible to optimise the configuration of the immersed guide rolls and to develop a control algorithm to position these rolls online ; - modelling and optimisation of the air pad stabilising and cooling ability ; - pilot line trials of the optimised air pad with controlled stabilising force based on the distance measurement between strip and blow boxes ; - development and calibration by online measurements of a model able to calculate the strip vibration in the vertical strand. On the basis of the results, it is possible to define process parameter windows - for example, critical strip speed range ; - design and validation of improved air knives geometry by large-scale trial campaigns in an industrial galvanising line.
- Published:
- Corporate author(s): Aceralia (Spain) , Centre de Recherches Métallurgiques (Belgium) , Directorate-General for Research and Innovation (European Commission) , Institut de Recherches de la Sidérurgie Française (France)
- Personal author(s): Rendueles, J. L ; Gacher, L ; Schyns, M
- Themes: Industrial research and development , Environmental research
- Subject: automation , electrical process , iron and steel industry , materials technology , research report , technological process
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| ISSN | ISBN 92-828-6723-4 | DOI | Catalogue number KI-NA-20-206-EN-S |
- Released on EU publications website:
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