Metal-strip warped-shape prediction method, metal-strip warped-shape control method, metal-strip manufacturing method, warped-shape prediction model generation method, and metal-strip warped-shape control device

Abstract

A metal-strip warped-shape prediction method for predicting an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip continuous annealing facility, the metal-strip continuous annealing facility including: heating equipment that heats the metal strip, cooling equipment that cools the metal strip heated by the heating equipment, the temper rolling mill that corrects a shape of the metal strip cooled by the cooling equipment, and an entry-side warped-shape measurement device that measures an entry-side warped shape, which is a warped shape of the metal strip upstream of the temper rolling mill between the cooling equipment and the temper rolling mill, the metal-strip warped-shape prediction method including: predicting the exit-side warped shape based on the entry-side warped shape and at least one of operating parameters of the temper rolling mill.

1 - 11 . (canceled) 
     
     
         12 . A metal-strip warped-shape prediction method for predicting an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip continuous annealing facility, the metal-strip continuous annealing facility including:
 heating equipment that heats the metal strip,   cooling equipment that cools the metal strip heated by the heating equipment,   the temper rolling mill that corrects a shape of the metal strip cooled by the cooling equipment, and   an entry-side warped-shape measurement device that measures an entry-side warped shape, which is a warped shape of the metal strip upstream of the temper rolling mill between the cooling equipment and the temper rolling mill, the metal-strip warped-shape prediction method comprising:   predicting the exit-side warped shape based on the entry-side warped shape and at least one of operating parameters of the temper rolling mill.   
     
     
         13 . The metal-strip warped-shape prediction method according to  claim 12 , wherein the exit-side warped shape is predicted using a warped-shape prediction model that receives input data including the entry-side warped shape and the at least one of operating parameters of the temper rolling mill, and the exit-side warped shape is outputted. 
     
     
         14 . The metal-strip warped-shape prediction method according to  claim 12 , wherein:
 the metal-strip continuous annealing facility further includes a pre-cooling warped-shape measurement device provided upstream of the cooling equipment; and   the exit-side warped shape is predicted based on a pre-cooling warped shape measured by the pre-cooling warped-shape measurement device, the entry-side warped shape measured by the entry-side warped-shape measurement device, and the at least one of operating parameters of the temper rolling mill.   
     
     
         15 . The metal-strip warped-shape prediction method according to  claim 14 , wherein the exit-side warped shape is predicted using a warped-shape prediction model that receives input data including the pre-cooling warped shape, the entry-side warped shape, and the at least one of operating parameters of the temper rolling mill, and the exit-side warped shape is outputted. 
     
     
         16 . A metal-strip warped-shape control method comprising:
 setting an operating parameter of the cooling equipment so that the exit-side warped shape is reduced when the exit-side warped shape predicted by the metal-strip warped-shape prediction method according to  claim 12  exceeds a target value.   
     
     
         17 . A metal-strip warped-shape control method comprising:
 setting an operating parameter of the cooling equipment so that the exit-side warped shape is reduced when the exit-side warped shape predicted by the metal-strip warped-shape prediction method according to  claim 13  exceeds a target value.   
     
     
         18 . A metal-strip warped-shape control method comprising:
 setting an operating parameter of the cooling equipment so that the exit-side warped shape is reduced when the exit-side warped shape predicted by the metal-strip warped-shape prediction method according to  claim 14  exceeds a target value.   
     
     
         19 . A metal-strip warped-shape control method comprising:
 setting an operating parameter of the cooling equipment so that the exit-side warped shape is reduced when the exit-side warped shape predicted by the metal-strip warped-shape prediction method according to claim  15  exceeds a target value.   
     
     
         20 . The metal-strip warped-shape control method according to  claim 16 , wherein:
 the cooling equipment includes a coolant jet injection device with a plurality of nozzles that inject cooling fluid onto both sides of the metal strip, and at least one pair of hold-down rolls that constrain the metal strip; and   the operating parameter of the cooling equipment is at least one of a push-in amount of the at least one pair of hold-down rolls onto the metal strip, an offset amount between the at least one pair of hold-down rolls, and a shift amount of the at least one pair of hold-down rolls.   
     
     
         21 . The metal-strip warped-shape control method according to  claim 18 , wherein:
 the cooling equipment includes a coolant jet injection device with a plurality of nozzles that inject cooling fluid onto both sides of the metal strip, and at least one pair of hold-down rolls that constrain the metal strip; and   the operating parameter of the cooling equipment is at least one of a push-in amount of the at least one pair of hold-down rolls onto the metal strip, an offset amount between the at least one pair of hold-down rolls, and a shift amount of the at least one pair of hold-down rolls.   
     
     
         22 . A metal-strip manufacturing method for manufacturing the metal strip with a tensile strength of 980 MPa or higher, the metal-strip manufacturing method comprising:
 utilizing the metal-strip warped-shape control method according to  claim 16 .   
     
     
         23 . A metal-strip manufacturing method for manufacturing the metal strip with a tensile strength of 980 MPa or higher, the metal-strip manufacturing method comprising:
 utilizing the metal-strip warped-shape control method according to  claim 18 .   
     
     
         24 . A warped-shape prediction model generation method for generating a warped-shape prediction model that predicts an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip continuous annealing facility, the metal-strip continuous annealing facility including:
 heating equipment that heats the metal strip,   cooling equipment that cools the metal strip heated by the heating equipment,   the temper rolling mill that corrects a shape of the metal strip cooled by the cooling equipment,   an entry-side warped-shape measurement device that measures an entry-side warped shape, which is a warped shape of the metal strip upstream of the temper rolling mill between the cooling equipment and the temper rolling mill, and   an exit-side warped-shape measurement device that measures the exit-side warped shape downstream of the temper rolling mill, the warped-shape prediction model generation method comprising:   acquiring a plurality of datasets, each of which includes a set of the entry-side warped shape measured by the entry-side warped-shape measurement device, at least one of operating parameters of the temper rolling mill, and the exit-side warped shape measured by the exit-side warped-shape measurement device; and   generating the warped-shape prediction model that receives input data including the entry-side warped shape and the at least one of operating parameters of the temper rolling mill, and outputs the exit-side warped shape through machine learning using the acquired datasets as training data.   
     
     
         25 . The warped-shape prediction model generation method according to  claim 24 , wherein:
 the metal-strip continuous annealing facility further includes a pre-cooling warped-shape measurement device provided upstream of the cooling equipment; and   the method further comprises:
 acquiring the plurality of datasets, each of which includes a set of a pre-cooling warped shape measured by the pre-cooling warped-shape measurement device, the entry-side warped shape, the at least one of operating parameters of the temper rolling mill, and the exit-side warped shape, and 
 generating the warped-shape prediction model that receives input data including the pre-cooling warped shape, the entry-side warped shape, and the at least one of operating parameters of the temper rolling mill, and outputs the exit-side warped shape through machine learning using the acquired datasets as training data. 
   
     
     
         26 . A metal-strip warped-shape control device that controls an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip continuous annealing facility, the metal-strip continuous annealing facility including:
 heating equipment that heats the metal strip,   cooling equipment that cools the metal strip heated by the heating equipment,   the temper rolling mill that corrects a shape of the metal strip cooled by the cooling equipment, and   an entry-side warped-shape measurement device that measures an entry-side warped shape, which is a warped shape of the metal strip upstream of the temper rolling mill between the cooling equipment and the temper rolling mill, the metal-strip warped-shape control device comprising:   a processor that is configured to:   acquire the entry-side warped shape measured by the entry-side warped-shape measurement device, and at least one of operating parameters of the temper rolling mill;   predict the exit-side warped shape using a warped-shape prediction model that receives input data including the entry-side warped shape and the at least one of operating parameters of the temper rolling mill, and outputs the exit-side warped shape; and   specify an operating parameter of the cooling equipment so that the exit-side warped shape is reduced when the exit-side warped shape predicted exceeds a target value.   
     
     
         27 . The metal-strip warped-shape control device according to  claim 26 , wherein:
 the metal-strip continuous annealing facility further includes a pre-cooling warped-shape measurement device provided upstream of the cooling equipment; and   the processor is further configured to:
 acquire a pre-cooling warped shape measured by the pre-cooling warped-shape measurement device; and 
 predict the exit-side warped shape using the warped-shape prediction model that receives input data including the pre-cooling warped shape, the entry-side warped shape, and the at least one of operating parameters of the temper rolling mill, and outputs the exit-side warped shape.