ROLLING METHOD FOR PREVENTING SHEET FORM BENDING IN HOT ROUGH ROLLING STAGE

摘要

PURPOSE:To improve the sheet straightening efficiency by measuring a sheet bending amount and a sheet temp. distribution in the width direction on the outlet side of horizontal rolling mills and by obtaining a required roll gap difference of the horizontal rolling mills based on a deformation resistance difference in the sheet width direction and a sheet bending amount. CONSTITUTION:A width direction thermometer 2a and a sheet bending amount measuring instrument 3a are installed on the outlet side of a rolling mill 1a of a hot rough rolling device consisting of horizontal rolling mills 1a, 1b. An arithmetic unit 7a finds a deformation resistance difference in the width direction of the rolling material 4 in a relation between temps. and deformation resistances based on the temp. distribution in the width direction of the rolling material 4 detected by the thermometer 2a. Then, the material 4 is rolled by setting a roll gap difference between gaps at both ends of the mill 1b based on a relation between a previously measured deformation resistance value and a sheet bending amount and an actual sheet bending amount measured by the instrument 3a. The straightening accuracy for sheet bending and the straightening efficiency are improved because of adjustment considering for a deformation resistance difference caused by a temp. distribution in the sheet width direction.