EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

To decrease time in defect crisis solving in roughing mill in ArcelorMittal Dofasco, a very robust vision system, RollScope, has been installed in stand in front of lower roll. The RollScope developed by CRM allows to take images of roll surface using a water column to avoid vapour and waste disturbances. This water column acts so as a guide light resulting in very good quality of images of field of view width from 6 to 8mm. The difficulty to overcome was the very small available space. Two solutions have been studied: using positioning units inside the stand or using a beam placed between chokes to support the measurement head. Both these solutions will be discussed in this paper. The following of industrial campaigns and the resulting images analysis have been used to define of a procedure to optimise scheduling and process conditions to suppress the occurrence of critical roll degradation at the origin of surface defects and are described.