Experimental Investigation on Elimination of Roll Defects for HC Reversing Cold Mills

For the rolls of the 1200 HC(high crown) 6-high reversing cold mills,the measures of precaution and elimination of roll failures were put forward from some aspects such as roll inspection,roll grinding and assembly etc.Firstly,advanced inspection methods such as magnaflux method,portable roll surface rigidity detector,macrostructure analysis and so on should be applied to find out the roll defects,which are difficult to be observed with naked eyes.Secondly,some measures,such as modifying cooling and lubrication systems and filtrating equipment,designing reasonable grinding amount and roll changing period,and machining the compound chamfer angles at two shoulders of the intermediate rolls and backup rolls etc.,can reduce roll consumption,and increase roll campaign.After modification,the roll changing period was increased from 100 km to 160 km,the roll defects and consumption(including the intermediate rolls and backup rolls) were greatly decreased,and the hour output of mill was improved by 11.1%.