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Controlling wear and surface cleanliness during cold rolling (LOWWEAR)
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Controlling wear and surface cleanliness during cold rolling (LOWWEAR)

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This report describes the work done in the LOWWEAR project. The project objectives were to increase the fundamental understanding of wear in cold rolling processes, to experimentally determine the rolling parameters that have an influence and to develop (online) methods to measure wear. The analytical techniques revealed the different wear mechanisms (abrasive, chemical and adhesive) that play a role in cold rolling. Iron fines were found to originate mostly from the strip. An overview was made of the usefulness of different analytical techniques. A plate-out tester was developed. As for the lubricant application parameters it appeared that spray pressure, sample and emulsion temperature have a significant influence on the plate-out. With the tester it was not possible to wash off the wear debris from the strip surface by impact of the applied coolant/lubricant. In the experimental rolling programme it was established that the rolling parameters that have most influence on strip cleanliness after cold rolling are : • work roll roughness • work roll coating • strip thickness reduction • rolling speed • material grade of rolled strip Rolling parameters that have surprisingly only a small influence on strip cleanliness are : • oil composition • oil concentration in the emulsion • forward slip Two online measurement methods were developed, one to measure the amount of iron fines in the emulsion, the other to measure the strip cleanliness on the strip. Both have shown to be accurate but robustness is still a problem. One method has been implemented in an industrial mill.
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ISSN 1831-9424
ISBN 978-92-79-22223-8
DOI 10.2777/23177
Katalognummer KI-NA-25074-EN-N
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ISSN 1831-9424 ISBN 978-92-79-22223-8 DOI 10.2777/23177 Katalognummer KI-NA-25074-EN-N
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