COLD ROLLING - COOLING ENHANCEMENT AND OPTIMIZATION

1 HNIZDIL Milan
Co-authors:
1 CHABICOVSKY Martin 1 RESL Ondrej
Institution:
1 Heat transfer and fluid flow laboratory, Brno University of Technology, Faculty of Mechanical engineering, Brno, Czech Republic, EU, Milan.hnizdil@vut.cz, Martin.Chabicovsky@vut.cz, Ondrej.Resl@vut.cz
Conference:
33rd International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 22 - 24, 2024
Proceedings:
Proceedings 33rd International Conference on Metallurgy and Materials
Pages:
81-86
ISBN:
978-80-88365-21-1
ISSN:
2694-9296
Published:
26th June 2024
Proceedings of the conference have been sent to Web of Science and Scopus for evaluation and potential indexing.
Metrics:
60 views / 43 downloads
Abstract

<div>The paper is focused on experimental research with the goal of enhancing cold mill capability by improving the currently used coolant setting (various types of emulsions) and cooling configuration (type of nozzle, nozzle position, distance and inclination angle of headers with respect to the roll).The experimental research was divided into two phases. The initial phase examined the impact of various emulsion types on cooling intensity. Pure water, coconut, lard and palm oil-based emulsions with various oil concentrations were tested. The highest cooling intensity was found for the pure water. The heat transfer coefficient decreased with the increase of the oil concentration. The cooling intensity was comparable for different emulsions.The second phase was focused on cooling optimization. The goal was to enhance cooling intensity while reducing the consumption of the cooling medium. The research methodology was based on the specialized experimental stand that simulated cooling processes on a rotating surface. The heat transfer coefficient was investigated for a typical cooling system. Then, the cooling configuration (nozzle size, type, position and header inclination angle) was optimized and the comparison of a new and old cooling system shoved higher cooling efficiency with lower water consumption (25 % less).Finally, roll cooling simulations were conducted for both cooling variants to compare the impact on roll temperature during rolling. The advantage of the optimized cooling system was minimal (roll temperature decreased by 5°C) due to the slight difference between the coolant temperature (60°C) and the strip temperature (200°C). However, lowering the coolant temperature to 20°C caused the roll temperature decrease by 30°C.</div>

Keywords: Cold rolling cooling; emulsion concentration; cooling intensity, heat transfer coefficient, cooling optimization

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