Patent ID: 7926316
Filing Date: 2011-04-19
Classification: B21B

Abstract:
1. A temperature control device for a hot rolling mill having a plurality of rolling stands, arranged in a row, for rolling a heated rolled material, in succession, using the plurality of rolling stands, the temperature control device comprising: a plurality of cooling devices, each cooling device being located between a different, respective pair of the plurality of rolling stands, to cool the rolled material by spraying cooling water; an entry side temperature meter for detecting the temperature of the rolled material on an entry side of the rolling mill; a delivery side temperature meter for detecting the temperature of the rolled material on a delivery side of the rolling mill; a first cooling water pressure computing section which computes cooling water pressure of the cooling devices so that the cooling devices are preferentially used, in order, from the one of the cooling devices that is closest to the entry side of the rolling mill, until an upper limit pressure is reached, based on a target temperature of the rolled material on the delivery side of the rolling mill, and the temperature actually detected by the entry side temperature meter, wherein the first cooling water pressure computing section computes the cooling water pressure of the cooling device only during an initial stage of rolling, from before a front end of the rolled material enters the rolling mill and until the first end of the rolled material arrives at a temperature detection position of the delivery side temperature meter; a second cooling water pressure computing section which computes, for the cooling devices in operation, the cooling water pressure of the cooling device that is closest to the delivery side of the rolling mill, based on the target temperature of the rolled material and the temperature actually detected by the delivery side temperature meter at the temperature detection position of the delivery side temperature meter, so that the difference between the target temperature and the temperature actually detected by the delivery side temperature meter at the delivery side of the rolling mill is minimized; and a controlled object selecting section configured so that