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For economic reasons, stainless steel precision strip is made of slit pre-rolled wide strip. Such �slit strip�, as it is commonly called, often exhibits an asymmetrical thickness profile as a result of the pre-rolling stages to which it has been subjected. In the rolling mill this thickness profile is a source of significant problems. The material winds into a tapered coil, which distorts the coiler tension acting on the strip. This distortion not only causes run-out in the cross-strip direction during coiling but also produces measuring errors in the flatness measurement performed by measuring rolls, which are fitted upstream of the coiler in the form of deflection rolls. Extensive investigations on a laboratory system enabled us to demonstrate the levelling effect of deflection rolls on the strip. On the basis of these findings it was possible to determine a roll configuration whereby the tensile force emanating from the coils is decoupled, or �isolated�, from the measuring roll. The installation of such a system on a production line led to a significant increase in output since the availability of the flatness control system made the process more reliable, permitting the use of higher rolling speeds.

Additional information

Authors: PUTZ P-D, Betriebsforschungsinstitut (BFI), Dusseldorf (DE);GORGELS F, Betriebsforschungsinstitut (BFI), Düsseldorf (DE);PÜTZ P-D, Betriebsforschungsinstitut (BFI), Düsseldorf (DE);ASSMANN W, Krupp Thyssen Nirosta (KTN), Schalksmühle (DE);HANSEN T, MEFOS, Luleå (SV)
Bibliographic Reference: EUR 20924 EN (2003), 65 pp. Euro: 15
Availability: EUR-OP reference: KI-NA-20924-EN-C Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-6636-7
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