Rolling facility and rolling method

Abstract

The present invention relates to a rolling facility and a rolling method. According to the present invention, the rolling facility comprises: a roughing mill having a roughing mill roll for pressing a material to be transferred; a finishing mill having a finishing mill roll, which is provided on a material transfer path, and pressing the material having passed through the roughing mill; a wiper device provided at a feed-in side of the finishing mill roll, polishing the surface of the finishing mill roll, and supplying cooling fluid to the material; and a cooling device provided on the material transfer path and cooling the material having passed through the finishing mill, wherein the wiper device can include a plurality of cooling header units for supplying the cooling fluid to the material at different positions.

1 . A rolling facility comprising:
 a roughing mill including a roughing roll pressing a material transferred thereto;   a finishing mill including a finishing roll, provided on a material conveying path and pressing the material having passed through the roughing mill;   a wiper device provided on an inlet side of the finishing roll, polishing a surface of the finishing roll, and supplying a cooling fluid to the material; and   a cooling device provided on the material conveying path and cooling the material having passed through the finishing mill,   wherein the wiper device includes a plurality of cooling header units supplying the cooling fluid to the material in different positions.   
     
     
         2 . The rolling facility of  claim 1 , wherein the wiper device comprises:
 a device frame disposed after the finishing roll in a material travel direction;   a wiper member provided on the device frame; and   a cooling header unit provided on the device frame or the wiper member, supplying a largest amount of cooling fluid in a position farthest away from the finishing roll, and supplying a smallest amount of cooling fluid in a position closest to the finishing roll.   
     
     
         3 . The rolling facility of  claim 2 , wherein the wiper device further comprises a cooling header adjusting unit connected to the cooling header unit to adjust at least one of a distance from the cooling header unit to the finishing roll or the material and an angle formed by the cooling header unit with the material, to prevent the cooling fluid supplied to the material from overlapping. 
     
     
         4 . The rolling facility of  claim 3 , wherein the cooling header adjusting unit comprises:
 a distance adjusting unit, connected to the cooling header unit, to move the cooling header unit along the wiper member to vary a distance from the cooling header unit to the finishing roll or the material; and   an angle adjusting unit connected to the device frame or the wiper member to rotate the device frame or the wiper member to adjust an angle formed by the cooling header unit with the material.   
     
     
         5 . The rolling facility of  claim 4 , wherein the cooling header unit comprises:
 a plurality of cooling pipes provided on the wiper member to face the material and spaced apart from each other by a predetermined distance; and   a cooling nozzle provided in the plurality of cooling pipes and provided as a plurality of cooling nozzles disposed in a width direction of the material.   
     
     
         6 . The rolling facility of  claim 5 , wherein the distance adjusting unit comprises:
 a moving frame supporting or fixing the plurality of cooling pipes;   a moving rail provided on the moving frame and the wiper member; and   a power transmission unit connected to the moving frame or the plurality of cooling pipes to move the moving frame or the plurality of cooling pipes along the moving rail.   
     
     
         7 . The rolling facility of  claim 6 , wherein the power transmission unit comprises:
 a screw housing provided on the moving frame; and   a screw member connected to a rotary shaft of a motor connected to an encoder, and connected to the screw housing.   
     
     
         8 . The rolling facility of  claim 5 , wherein the angle adjusting unit comprises an angle adjusting motor in which a rotary shaft is connected to the device frame or the wiper member, and adjusts an angle formed by a jet port of the cooling nozzle with the material by rotating the device frame or the wiper member by the angle adjusting motor. 
     
     
         9 . The rolling facility of  claim 8 , wherein the wiper device further comprises a sensing unit provided on at least one of the device frame, the wiper member, and the plurality of cooling pipes, the sensing unit being electrically connected to a control unit. 
     
     
         10 . The rolling facility of  claim 9 , wherein the sensing unit comprises:
 an angle sensor provided on the device frame or the wiper member; and   a distance sensor provided on the plurality of cooling pipes.   
     
     
         11 . The rolling facility of  claim 1 , further comprising an outlet-side cooling device provided on an exit side of the finishing roll to supply the cooling fluid to the finishing roll. 
     
     
         12 . The rolling facility of  claim 11 , wherein the material is a material comprising at least one of a medium carbon steel having 0.08% to 0.3% by weight of carbon, a high carbon steel having 0.3% or more by weight of carbon, and a niobium (Nb)-added steel. 
     
     
         13 . A method of rolling a material using a rolling facility, comprising:
 a roughing operation of pressing the material with a roughing mill;   an inlet-side cooling operation of supplying a cooling fluid to the material, on an inlet side of a finishing roll of a finishing mill;   a finishing operation of pressing the material with the finishing roll after the inlet-side cooling operation or during the inlet-side cooling operation; and   an outlet-side cooling operation of supplying the cooling fluid to the finishing roll and the material, on an exit side of the finishing roll, after the finishing operation or during the finishing operation.   
     
     
         14 . The rolling method of  claim 13 , wherein in the inlet-side cooling operation, the cooling fluid is supplied to a plurality of cooling pipes spaced apart from each other by different distances from the finishing roll, to supply a greatest amount of cooling fluid at a farthest distance from the finishing roll and supply a smallest amount of cooling fluid at a closest distance from the finishing roll. 
     
     
         15 . The rolling method of  claim 14 , wherein the inlet-side cooling operation comprises a nozzle adjusting operation of changing a position of a nozzle supplying the cooling fluid or rotating the nozzle. 
     
     
         16 . The rolling method of  claim 15 , wherein the nozzle adjusting operation is performed by changing a distance from the nozzle to the finishing roll or the material or changing an angle formed by the nozzle with respect to the material. 
     
     
         17 . The rolling method of  claim 14 , wherein the inlet-side cooling operation is performed to supply the cooling fluid to the material, such that a temperature of a material, including at least one of a medium carbon steel having 0.08% to 0.3% by weight of carbon, a high carbon steel having 0.3% or more by weight of carbon, and a niobium (Nb)-added steel, is within a range of 850° C. to 900° C.