BREAKOUT PREDICTION METHOD IN CONTINUOUS CASTING

• Main Authors: TANIGUCHI SATOSHI, GOTO GENTA, OGATA KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 28.05.2020
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

To provide a method capable of correctly predicting the generation of breakout without depending on the change of casting conditions and the incidental hunting of a measured temperature in the continuous casting of a slab.SOLUTION: A mold temperature is measured using a temperature detector 11 buried in a mold wall face 10 of a continuous casting facility. Based on the measured mold temperature, when a temperature rise speed Q exceeds a threshold Qof temperature rise start speed and the excess time thereof exceeds a threshold tseconds, it is determined that the excess of mold temperature rise speed is generated, when, after generation of the excess of mold temperature rise speed, the time for which a temperature rise amount R exceeds a threshold Rexceeds a threshold tseconds, it is determined that the excess of casting direction temperature rise amount is generated, when, after generation of the excess of casting direction temperature rise amount, the time for which a temperature drop speed S exceeds a threshold Swithin a temperature peak time P seconds exceeds a threshold tseconds, it is determined that the excess of casting direction temperature drop speed is generated, and, when the excess of casting direction temperature drop speed is generated, it is determined that there is a risk that breakout may occur.SELECTED DRAWING: Figure 1 【課題】鋳片の連続鋳造において、鋳造条件の変化や測定温度の偶発的なハンチングにかかわらず、ブレークアウトの発生を正確に予知することが可能な方法を提供する。【解決手段】連続鋳造設備の鋳型壁面１０に埋設された温度検出器１１を用いて鋳型温度を測定し、測定した鋳型温度を基に温度上昇速度Ｑが温度上昇開始速度の閾値Ｑｍｉｎを超え、その超えた時間が閾値ｔＱ秒を超えた場合に鋳型温度上昇速度超過発生と判定し、鋳型温度上昇速度超過発生後に、温度上昇量Ｒが閾値Ｒ上ｍｉｎを超過する時間が閾値ｔＲ秒を超過した場合に鋳造方向温度上昇量超過発生と判定し、鋳造方向温度上昇量超過発生後に、温度ピーク時間Ｐ秒以内に温度下降速度Ｓが閾値Ｓｍｉｎを超過した時間が閾値ｔＳ秒を超えた場合に鋳造方向温度下降速度超過発生と判定し、鋳造方向温度下降速度超過が発生した際に、ブレークアウトに至る可能性があると判定する。【選択図】図１