| 摘要 |
PROBLEM TO BE SOLVED: To estimate a molten steel flow in an immersion nozzle during casting for determining casting steel quality and the like by detecting vibration of a molten steel immersion nozzle in a mold of a continuous casting device. SOLUTION: A vibration sensor 7 (a laser vibrometer and the like) is installed nearby an immersion nozzle 1 in a mold. When vibration of the immersion nozzle 1 is detected by the vibration sensor 7, it is inputted into a determiner 10 via a band pass filter 8b, an amplifier 8a, a signal converter 9 which are connected to the vibration sensor 7 in succession. Relationship between vibration strength, ranking of a cast piece quality grading is memorized in advance in the determiner 10 so as to carry out a cast piece quality grading based on the immersion nozzle 1 vibration strength inputted in the determiner 10. Also, relationship between vibration strength, need for cast piece maintenance, and degree of maintenance is memorized in advance so that need for the cast piece maintenance and degree of the maintenance can be decided based on a vibration strength distribution of the immersion nozzle 1 inputted in the determiner 10.
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