Technology for Reducing Strip Meandering in Tandem Cold Mill

摘要

Strip meandering in a tandem cold mill causes strip breakage troubles and must be suppressed. The issue of meandering has been studied for a long time, but many of the studies focused on run out of the strip tail end with tension released, or on the inter-stand meandering behavior during tandem rolling. On the other hand, even at the entry side of a tandem cold mill with a tension lower than that of inter-stand, strips may meander due to various disturbances and cause problems. Hence, an analysis model of meandering behavior was constructed while considering the restraint by bridle rolls disposed on the entry side of a tandem cold mill. The effect of entry side tension on meandering behavior was investigated, and the calculation results were verified by rolling experiments. It was found that the tension enhancement on the entry-side was effective for the suppression of meandering. Consequently, the entry-side tension of the tandem cold mill of Kakogawa Works was increased, and this has reduced the problems due to meandering.