| 摘要 |
PURPOSE:To improve the quality of a casting slab by calculating beforehand the relation between temp. changing of a mold wall, casting speed and development of longitudinal cracking in the slab and also detecting temp. of the mold wall in on-line, to detect the longitudinal cracking in accordance with the temp. changing of the mold wall. CONSTITUTION:Plural thermocouples 6 are set on the mold 3 and connected with a temp. detector 7 and also a computing element 8 for casting monitor is arranged. Beforehand, the relation between temp. changing and development of the longitudinal cracking in the slab 4 for each steel kind and drawing speed, that is, min. value of temp. changing of the mold wall, which develops the longitudinal cracking, is calculated. Next, at continuous casting, the temp. of the mold wall is detected in the fixed sampling cycle through the thermocouples 6 and the temp. detector 7 and also this temp. changing value is calculated by the arithmetic unit 8. In accordance with this result, the longitudinal cracking in the slab is detected in on-line, to correct immediately casting condition. In this way, the quality of the casting slab 4 is improved.
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