Method and casting machine for production of casting bars in the shape of billets or blocks

Abstract

The invention relates to a method of producing cast strands ( 2 ) in shapes of billets or ingots wherein the strand ( 2 ) is guided between pairs of rollers ( 4 to n). In their straightening region (A), the strands ( 2 ) are formed, with the use of profiled rollers ( 4 to) with one-sided or multiple-sided projections (h, b) or recesses (−h, b). In the casting direction ( 10 ), downstream of the straightening region, the strands are subjected to a soft-reduction with at least one roller pair ( 7 to 9 ) with smooth rollers. The invention also relates to a casting machine provided with correspondingly formed rollers.

1 - 15 . (Cancelled).  
     
     
         16 . A method of producing cast strands ( 2 ) in shape of billets or ingots which are formed into a cast strand ( 2 ) in a continuous casting mold ( 1 ) and beneath it are deflected by a cast radius R from a vertical into a horizontal casting direction ( 13 ) and finally pass through a straightening region where the strand ( 2 ) is guided between pairs ( 4  to n) of rollers which are adjoined by a soft-reduction region B with at least one roller pair,  
       characterized in that 
 in a straightening region (A), the strands are formed with one or several projections (h, b) or recesses (−h, −b) by using profiled rollers ( 4 - 6 ), and in that downstream of the straightening region (A), in the casting direction ( 13 ), the strands are subjected to a soft-reduction (B) with the at least one roller pair ( 7  to  9 ) with smooth rollers.  
 
     
     
         17 . A method according to  claim 16 ,  
       characterized in that 
 in a region of soft reduction (B), the roller pair ( 7 - 9 ) is advanced toward and away according to a position of a lowest point of a liquid pool.  
 
     
     
         18 . A method according to  claim 16 ,  
       characterized in that 
 the soft reduction (B) is preferably effected with one roller pair ( 7  to  9 ).  
 
     
     
         19 . A method according to claims  16 ,  
       characterized in that 
 the position of the liquid pool lowest point is determined with calculation models and/or measurement technique, e.g., by measuring a position or force, with the roller pair ( 7  to  9 ) being correspondingly adjusted.  
 
     
     
         20 . A method according to  claim 16 ,  
       characterized in that 
 with two-sided projections (h, b, h 1 , b 1 ) or recesses (−h, −b, −h 1 , −b 1 ) are, preferably, provided on opposite sides of the strand ( 2 ).  
 
     
     
         21 . A method according to  claim 16 ,  
       characterized in that 
 with steel stocks with segregation tendencies and/or core porosity, the projections (h, b) or recesses (−h, −b) of the strand cross-sections are provided on all four sides.  
 
     
     
         22 . A method according to  claim 16   
       characterized in that 
 at a one-sides shaping, the projection height (h) constitutes maximum 8% of thickness of a reducible strand ( 2 ).  
 
     
     
         23 . A method according to  claim 16 ,  
       characterized in that 
 at a two-sided shaping, the projection height (h) on each side constitutes maximum 6%.  
 
     
     
         24 . A method according to one or more of claims  16 ,  
       characterized in that 
 at an all-sided shaping, the projection height on each side constitutes maximum 4%.  
 
     
     
         25 . A method according to  claim 16 , 
 characterized in that    a width (b) of a profile constitutes from 30 to 80% of a corresponding side.    
     
     
         26 . A casting machine for producing cast strand ( 2 ) in shape of billets or ingots, comprising a continuous casting mold ( 1 ) for forming a cast strand ( 2 ) that is deflected by a cast radius (R) from a vertical in horizontal casting direction ( 13 ) and is provided with a straightening region (A) with straightening roller pairs ( 4 ,  5 ,  6 ) which are adjoined by a soft-reduction region (B) with at least one roller pair ( 7 ,  8 ,  9 ),  
       characterized in that 
 profiled roller pairs ( 4  to  6 ) are associated with the straightening region (A), and the at least one roller pair ( 7  to  9 ) has smooth rollers.  
 
     
     
         27 . A casting machine according to  claim 26 ,  
       characterized in that 
 for the straightening region (A), in particular on both sides of a tangent point ( 3 ) at least one pair of profiled rollers ( 4  to  6 ) is provided.  
 
     
     
         28 . A casting machine according to  claim 26 ,  
       characterized in that 
 for an optimal adaptation of the roller pair ( 7 - 9 ) to a position of a liquid pool lowest point, the rollers are displaceable substantially horizontally in a casting direction ( 13 ) or in a direction opposite the casting direction.  
 
     
     
         29 . A casting machine according to  claim 26 ,  
       characterized in that 
 the roller pair(s) are arranged horizontally and/or vertically in the region of soft-reduction (B).  
 
     
     
         30 . A casting machine according to  claim 26   
       characterized in that 
 the profiled rollers ( 4  to  6 ) are formed with negative diametrical regions (−h, −b) or with positive diametrical regions (+h, b).