Continuous casting and rolling method and continuous casting and rolling apparatus

Abstract

Provided is a continuous casting and rolling method, which includes: a continuous casting operation of producing a slab; and a rolling operation of pressing the slab after a front end portion of the slab passes a first rolling stand into which the front end portion of the slab, which is provided as a continuous body to the slab produced in the continuous casting operation, initially enters.

1 . A continuous casting and rolling method, comprising:
 a continuous casting operation of producing a slab; and   a rolling operation of reducing the slab after a front end portion of the slab passes a first rolling stand into which the front end portion of the slab, which is provided as a continuous body with the slab produced in the continuous casting operation, initially enters.   
     
     
         2 . The continuous casting and rolling method of  claim 1 , wherein, in the rolling operation, the slab is reduced, after the front end portion of the slab passes a rolling mill, a group of a plurality of rolling stands including the first rolling stand. 
     
     
         3 . The continuous casting and rolling method of  claim 1 , wherein the rolling operation includes:
 an inputting operation of passing the front end portion of the slab through the first rolling stand, which is open;   a supporting operation of allowing a pair of rolling rolls, provided in the first rolling stand after the front end portion of the slab passes the first rolling stand, to be in close contact with the slab; and   a reducing operation of reducing the slab with the second rolling stand, when the front end portion of the slab enters a second rolling stand provided after the first rolling stand.   
     
     
         4 . The continuous casting and rolling method of  claim 1 , wherein the rolling operation includes:
 an inputting operation of passing the front end portion of the slab through the first rolling stand, which is open;   a reducing operation of reducing the slab with the second rolling stand, when the front end portion of the slab enters a second rolling stand provided after the first rolling stand; and   a buffering operation of moving a pair of rolling rolls provided in the first rolling stand upwardly or downwardly, or moving a pair of pinch rolls provided in an inlet of the first rolling stand upwardly or downwardly, when a portion of the slab, having been reduced, moves backwards to the first rolling stand.   
     
     
         5 . The continuous casting and rolling method of  claim 1 , wherein, in the rolling operation, a pair of rolling rolls, provided in each of a plurality of rolling stands including the first rolling stand, sequentially roll the slab while a distance is gradually reduced in a direction of progress of the slab. 
     
     
         6 . A continuous casting and rolling apparatus, comprising:
 a continuous caster for producing a slab; and   a rolling mill located at an outlet of the continuous caster, and having a plurality of rolling stands including a first rolling stand into which a front end portion of the slab, which is provided as a continuous body with the slab produced in the continuous caster, initially enters,   wherein the rolling mill is provided to reduce the slab after the front end portion of the slab passes the first rolling stand.   
     
     
         7 . The continuous casting and rolling apparatus of  claim 6 , wherein the rolling mill includes:
 a support point determining sensor provided at an outlet of the first rolling stand, and sensing the front end portion of the slab; and   a reducing point determining sensor provided in an inlet of a second rolling stand provided after the first rolling stand, and sensing the front end portion of the slab.