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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 26
SUMMARY:Development of double cold reduction (DCR) process towards modern grades by asymmetric rolling
DESCRIPTION:In the cold rolling business, the trend towards thinner and/or materials with higher strength or generally improved mechanical properties is unbroken. For the DCR process (double cold reduction) in tin plate industry, this means production of grades DR9.5 (AISI/ASTM 623) or beyond, final thickness towards 0.1mm, and reduction up to 50% in a single pass. 

When roll gap lubrication conditions and strip tensions already are at an adequate level, reduction of work roll diameter remains the most efficient way to achieve these goals. For an existing mill, normally this affords an extensive revamp. To overcome this situation, a cassette with two smaller rolls was developed, which exactly substitutes one of the large work rolls in the first stand of a DCR mill, so that in fact a 5-hi configuration is created. The change between 4-hi and 5-hi mode and back is as simple as a normal work roll change.

In the presentation, the theoretical aspects of combination of small and large work roll diameter and the influence of these asymmetric conditions on process parameters, material flow and properties are discussed. 

A prototype system was designed by SMS group. It was built in cooperation with thyssenkrupp Steel - Packaging Steel (Rasselstein) in Andernach and successfully  tested in the first stand of Rasselstein‘s DCR mill NWW4. Technological features regarding drive situation, horizontal forces and flatness control are described. Measured process data is presented, which illustrates the potential, regarding roll force decrease in combination with high strip thickness reductions.

CLASS:PUBLIC
DTSTART:20230615T102000
DTEND:20230615T104000
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