Patent ID: 8500927
Filing Date: 2013-08-06
Classification: B21B,B21C

Abstract:
1. A manufacturing apparatus of a hot-rolled steel sheet comprising: a row of hot finishing mills; an immediate rapid-cooling device, which is disposed on an exit side of a final stand in the row of hot finishing mills, and at least a part of which is disposed inside the final stand so as to be capable of spraying cooling water; a device for measuring a temperature on an entry side of a final stand, which is arranged in a manner capable of measuring a surface temperature of a steel sheet on an entry side of the final stand; a device for measuring a steel sheet passing speed, which is arranged in a manner capable of measuring a passing speed of the steel sheet on the entry side of the final stand; a device for predicting a rapid-cooling stopping temperature, which calculates a predicted rapid-cooling stopping temperature based on: the surface temperature of the steel sheet measured by the device for measuring a temperature on an entry side of a final stand; the steel sheet passing speed measured by the device for measuring the steel sheet passing speed; and the water supply volume or water supply pressure of the immediate rapid-cooling device; and an immediate rapid-cooling control device, which corrects the water supply volume or water supply pressure of the immediate rapid-cooling device such that the predicted rapid-cooling stopping temperature matches a targeted rapid-cooling stopping temperature.