Cold rolling mill rolling condition calculation method, cold rolling mill rolling condition calculation device, cold rolling method, cold rolling mill, and steel sheet manufacturing method
A cold rolling mill rolling condition calculation method includes: an estimation step of estimating a rolling constraint condition with respect to a target steady rolling condition of a roll target material, by inputting second multi-dimensional data to a prediction model, the prediction model having been trained with explanatory variable and response variable, the explanatory variable being first multi-dimensional data generated based on non-steady rolling performance data, among past rolling performance in rolling a roll material by a cold rolling mill, and the response variable being steady rolling performance data and rolling constraint condition data during steady rolling, and the second multi-dimensional data having been generated based on non-steady rolling performance data of the roll target material; and a change step of changing the target steady rolling condition so that the estimated rolling constraint condition satisfies a predetermined condition.
1 . A cold rolling mill rolling condition calculation method for a cold rolling mill having at least one rolling stand, the at least one rolling stand having a rolling mill exit side, the method comprising:
estimating a rolling constraint condition with respect to a target steady rolling condition of a roll target material, by inputting second multi-dimensional data to a prediction model,
the prediction model having been trained with explanatory variable and response variable,
the explanatory variable being first multi-dimensional data generated based on non-steady rolling performance data, among past rolling performance in rolling a roll material by the cold rolling mill, the roll material including a welded portion where a preceding material and a succeeding material are welded to each other, the non-steady rolling performance data being rolling performance data acquired when the welded portion passes through the rolling mill exit side of the at least one rolling stand, and
the response variable being steady rolling performance data and rolling constraint condition data during steady rolling, the steady rolling performance data being data indicating a target rolling speed during steady rolling of a roll material rolled in the past, and
the second multi-dimensional data having been generated based on non-steady rolling performance data of the roll target material; and
changing the target steady rolling condition so that the estimated rolling constraint condition satisfies a predetermined condition.
2 . The cold rolling mill rolling condition calculation method according to claim 1 ,
wherein
the changing includes changing the target rolling speed during steady rolling of the roll target material so that the estimated rolling constraint condition satisfies a predetermined condition.
3 . A cold rolling method comprising rolling a roll target material using a target steady rolling condition changed using the cold rolling mill rolling condition calculation method according to claim 1 .
4 . A steel sheet manufacturing method comprising:
cold rolling a roll material using the cold rolling method according to claim 1 ; and
applying an annealing treatment at a soaking temperature of 600° C. to 950° C. and a furnace tension of 0.1 to 3.0 kgf/mm 2 on the roll material rolled by cold rolling in the cold rolling.
5 . A cold rolling mill rolling condition calculation device for a cold rolling mill having at least one rolling stand, the at least one rolling stand having a rolling mill exit side, the device comprising an arithmetic device having an arithmetic processing section configured to:
estimate a rolling constraint condition with respect to a target steady rolling condition of a roll target material, by inputting second multi-dimensional data to a prediction model,
the prediction model having been trained with explanatory variable and response variable,
the explanatory variable being first multi-dimensional data generated based on non-steady rolling performance data, among past rolling performance in rolling a roll material by the cold rolling mill, the roll material including a welded portion where a preceding material and a succeeding material are welded to each other, the non-steady rolling performance data being rolling performance data acquired when the welded portion passes through the rolling mill exit side of the at least one rolling stand, and
the response variable being steady rolling performance data and rolling constraint condition data during steady rolling, the steady rolling performance data being data indicating a target rolling speed during steady rolling of a roll material rolled in the past, and
the second multi-dimensional data having been generated based on non-steady rolling performance data of the roll target material; and
change the target steady rolling condition so that the estimated rolling constraint condition satisfies a predetermined condition.
6 . A cold rolling mill comprising the cold rolling mill rolling condition calculation device according to claim 5 .