Method for the continuous rolling of a metal bar, particularly a steel bar, which is produced at a casting speed and the cross section of which is configured as a thin slab, and corresponding continuous casting machine

Abstract

Disclosed are a method and a corresponding continuous casting machine ( 1 ) for continuously rolling a metal bar, particularly a steel bar, which is produced at a casting speed and the cross section of which is configured as a thin slab. Said metal bar is bent, dressed, and cut to length as required during cooling and is fed into a first roll stand for rolling once the temperature has been equalized. Optionally the metal bar can still be fed by modifying the casting machine by supporting ( 3 ) a vertically cast continuous slab ( 2 ) having a guide length that is adjusted to the casting rate. One or several segments of said continuous slab ( 2 ) is/are then dressed by bending and straightening, whereupon the continuous slab ( 2 ) is guided by a sling ( 11 ), which is supported from below, into a straightening driver ( 6 ) that is positioned at a distance approximately equivalent to the length of the sling before being cut to length ( 7 ).

1 . Method for the continuous rolling of a metal strand, especially a steel strand, which is produced at casting speed, has the cross-sectional dimensions of a thin slab, is bent during cooling, straightened, cut to length as required, and after homogenization of the temperature, introduced into a first rolling stand to be rolled, wherein a vertically cast and solidifying strand with a guide length that is adjusted to the casting speed is supported, bent, and straightened in one or more segments and guided in a loop, which is supported from below, into a straightening driver, which is positioned at a distance approximately equal to the length of the loop, before being cut to length.  
   
   
       2 . Method in accordance with  claim 1 , wherein the loop is controlled in the straightening section or sections.  
   
   
       3 . Method in accordance with  claim 1 , wherein the strand is cast at a casting speed of 8-12 m/min.  
   
   
       4 . Method in accordance with  claim 1 , wherein a thin slab with a solidified thickness of 50-70 mm is produced.  
   
   
       5 . Method in accordance with  claim 1 , wherein the cast strand is bent and straightened at the outlet of the loop,  
   
   
       6 . Method in accordance with  claim 1 , wherein, when the casting speed is raised to the rolling feed speed of the first rolling stand, the thin slab is subjected to an initial pass down to a thickness of about 50 mm.  
   
   
       7 . Method in accordance with  claim 1 , wherein, at a casting thickness greater than 50 mm, the desired rolling thickness is reduced by liquid core reduction to such an extent that complete solidification is completed in the existing strand support without lengthening.  
   
   
       8 . Continuous casting machine which is connected in front of a rolling train and on which a metal strand, especially a steel strand, with the cross-sectional dimensions of a thin slab can be cast, wherein a vertical strand support is provided, which is adjusted to the casting speed and is followed by at least a bending driver, a straightening driver, a cut-to-length line, a continuous-type furnace, and the first rolling stand, wherein a free space ( 10 ) that extends downward approximately from the zero level ( 9 ) is provided between the bending driver ( 4 ) and the straightening driver ( 6 ), and a roller section ( 12 ), which can be raised and lowered and which is provided in a lowest position for a maximum loop ( 11 ) of the cast strand ( 2 ), is installed in this free space.  
   
   
       9 . Continuous casting machine in accordance with  claim 8 , wherein the formation of the loop ( 11 ) and thus the casting/rolling speed equalization are controlled by the straightening driver ( 6 ).  
   
   
       10 . Continuous casting machine in accordance with  claim 8 , wherein the continuous casting mold that is used is a CSP funnel mold.  
   
   
       11 . Continuous casting machine in accordance with  claim 8 , wherein at least one additional support segment ( 13 ) can be installed with increasing casting speed.  
   
   
       12 . Continuous casting machine in accordance with  claim 8 , wherein the bending driver ( 4 ) is initially installed on a separate support structure ( 14 ).  
   
   
       13 . Continuous casting machine in accordance with  claim 8 , wherein a dummy bar ( 1 S) can be withdrawn vertically downward.  
   
   
       14 . Continuous casting machine in accordance with  claim 8 , wherein the dummy bar ( 15 ) can be withdrawn upward to the zero level ( 9 ) behind the straightening driver ( 6 ).  
   
   
       15 . Continuous casting machine in accordance with  claim 8 , wherein a transversely movable auxiliary roller table for the dummy bar ( 15 ) and the dummy bar head is provided at the zero level.  
   
   
       16 . Continuous casting machine in accordance with  claim 8 , wherein a cutting torch ( 16 ), which can be moved out for emergency cutting, is provided in the area of the bending driver ( 4 ).