SECONDARY COOLING CONTROL DEVICE FOR CONTINUOUS CASTING MACHINE, SECONDARY COOLING CONTROL METHOD FOR CONTINUOUS CASTING MACHINE, AND PROGRAM

摘要

To provide a secondary cooling control device for a continuous casting machine, a secondary cooling control method for a continuous casting machine, and a program where, even if casting speed is changed, a major change is not caused in the solid phase ratio of the central part of a slab, and, a rolling draft to the slab upon the light rolling reduction of the slab before and after the casting speed can be fixedly held.SOLUTION: Provided is a cooling control device 100 deriving the entropy, temperature and solid phase ratio in the current time of a temperature evaluation position using a heat transfer solidification model. The cooling control device 100 derives the entropy, temperature and solid phase ratio when, regarding each of the temperature evaluation positions, the temperature evaluation position moves to a future predicted position on the downstream side in a casting direction using the heat transfer solidification model. The cooling control device 100 obtains a cooling water quantity change amount when an objective function J becomes minimum, the objective function J taking a low value as a deviation between the temperature of the central part of the slab at each future predicted position at each temperature evaluation position upon the change of the quantity of cooling water and the reference temperature in the central part of the slab corresponding to the future predicted position is lower.SELECTED DRAWING: Figure 1