| 摘要 |
PURPOSE:To prevent internal crack in a cast slab caused by irregularity of rolls by estimating synthetic strain generating in the cast slab from the irregular quantity of the rolls, the operational condition and the characteristic of continuous casting machine at the time of straightening the bending and giving the compressed strain to the cast slab by the driving roll so as to prevent the limit strain generating the internal crack. CONSTITUTION:The irregular quantity of the rolls is found by value of roll interval of adjoining two or more pairs of rolls measured by a roll interval measuring meter arranging on a dummy bar 7. Next the strain epsilonr generating in the cast slab 10 by irregularity of the rolls, etc., during the casting is in order estimated from the above value and the operational condition of casting speed, surface temp., solidified shell thickness, size of the cast slab, etc., and the characteristic of the continuous casting machine of curvature radius at the time of straightening the bending, roll pitch, molten steel static pressure, etc. Successively, the compressed pressure toward the cast slab casting direction is given by rotating force of the driving roll 15 so as to always satisfy relation of the inequality to the limited strain generating the interval crack at any position of the continuous casting machine.
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