| 摘要 |
PROBLEM TO BE SOLVED: To perform quantitative abnormality detection determination linked with operation indexes such as torque variation and molten surface variation, and to detect what kind of abnormalities generate according to the size of torque and the molten surface variation. SOLUTION: The torque variation value in the case the deposition of scale in a roll is generated is defined as a[%], a molten metal surface variation width is defined as Za[mm], further, a torque variation value in the case a surface defect is detected in a rolled material obtained by rolling a slab is detected, and, upon investigation of the defect, a solidified structure abnormality is confirmed is defined as b[%] and a molten metal surface variation width is defined as Zb[mm]. The range satisfying the conditions of the torque variation width N≥b is defined as a region B and the range satisfying the conditions of the torque variation value N≥a in the region other than the region B is defined as A. In the case the torque variation value N measured during casting belongs to the region B, the part is determined as flaw generation causing a solidified structure (S46B), and, in the case the torque variation value N belongs to the region A, it is determined that the deposition of scale or the like is present in any of the plurality of rolls (S47B). COPYRIGHT: (C)2011,JPO&INPIT |
