Laboratory evaluation of new type of backup roll for strip shape control

Abstract

In this research work, a new back-up roll was developed, which could be used in any type of 4 high mills to reduce the strip shape defects. The developed back-up roll consists of a sleeve, an arbor and a phase angle adjusting system for the arbor. The circumference of arbor was specially machined to adapt the strip width when changing the product and control the shape during rolling. The developed φ530mm×498mm backup roll was installed in a pilot mill and the rolling test was carried out to prove the effectiveness of the newly developed back-up roll. The rolling tests showed that the new back-up roll has better performance in reducing the shape defects than conventional back-up roll. It was also found that the new back-up roll provided higher shape stability. In addition, the arbor can be manufactured using scrapped conventional backup rolls, and it can be multi-times used because only sleeve surface needs to be reground and changed in most cases. © 2005 ISIJ.