Continuous casting method with rolls and relative device

Abstract

Continuous casting method and device ( 10 ) with rolls for plane products such as strips ( 13 ), wherein counter-rotating rolls ( 11 ) are partly immersed in a container ( 21 ) containing molten metal ( 22 ), said rolls ( 11 ) being arranged parallel and adjacent to define a gap ( 12 ) through which the strip ( 13 ) to be produced is extracted upward, said strip ( 13 ) being formed by the union of two semi-skins which are formed on the respective surfaces of said rolls ( 11 ) and are joined together in correspondence with a line of contact ( 30 ), said method providing that shearing means ( 27 ), arranged substantially in cooperation with the periphery of said rolls ( 11 ), act on the sides of said strip ( 13 ) to define at least the width of said strip ( 13 ) extracted from said rolls ( 11 ).

1 . Continuous casting method with rolls for plane products such as strips ( 13 ), wherein counter-rotating rolls ( 11 ) are partly immersed in a container ( 21 ) containing molten metal ( 22 ), said rolls ( 11 ) being arranged parallel and adjacent to define a gap ( 12 ) through which the strip ( 13 ) to be produced is extracted upward, said strip ( 13 ) being formed by the union of two semi-skins which are formed on the respective surfaces of said rolls ( 11 ) and are joined together in correspondence with a line of contact ( 30 ), the method being characterized in that it provides that shearing means ( 27 ), arranged substantially in cooperation with the periphery of said rolls ( 11 ), act on the sides of said strip ( 13 ) to define at least the width of said strip ( 13 ) extracted from said rolls ( 11 ).  
     
     
         2 . Method as in    claim 1   , characterized in that it provides to position two of said shearing means ( 27 ) arranged separated on the length of the respective rolls ( 11 ) and with the respective cutting edges ( 28 ) arranged in a position of cooperation with said line of contact ( 30 ) of said two semi-skins.  
     
     
         3 . Method as in    claim 1   , characterized in that it provides to position said shearing means ( 27 ) in contact with the respective ends of said rolls ( 11 ) to section the lateral parts ( 37 ) of the strip ( 13 ) which exceed the length of said rolls ( 11 ).  
     
     
         4 . Method as in    claim 1   , characterized in that it provides to position said shearing means ( 27 ) above and in an inner position with respect to said ends of the rolls ( 11 ) so as to define a width of the strip ( 13 ) which is less than the length of said rolls ( 11 ).  
     
     
         5 . Method as in    claim 4   , characterized in that it provides to translate said shearing means ( 27 ) along the rolls with the purpose of defining a variable width of the strip ( 13 ).  
     
     
         6 . Method as in    claim 1   , characterized in that it provides to use shearing means ( 27 ) of the type able to define a cutting edge of the strip ( 13 ) which already has the finishing characteristics required to the finished product.  
     
     
         7 . Method as in    claim 1   , characterized in that it provides to use fixed shearing means ( 27 ) of the mechanical type.  
     
     
         8 . Method as in    claim 1   , characterized in that it provides to use rotary shearing means ( 27 ) of the mechanical type.  
     
     
         9 . Method as in    claim 7    or    8   , characterized in that it provides to use shearing means ( 27 ) of the vibrating type.  
     
     
         10 . Method as in    claim 1   , characterized in that it provides to use shearing means ( 27 ) of the laser type.  
     
     
         11 . Method as in    claim 1   , characterized in that it provides to use anti-sticking means ( 31 ,  34 ,  35 ) arranged in cooperation with the ends of said rolls ( 11 ) and able to prevent the metal from sticking to the walls ( 33 ) of said rolls ( 11 ) to facilitate the subsequent shearing operation.  
     
     
         12 . Continuous casting device with rolls for plane products such as strips ( 13 ), comprising counter-rotating rolls ( 11 ) partly immersed in a container ( 21 ) containing molten metal ( 22 ), said rolls ( 11 ) being arranged parallel and adjacent to define a gap ( 12 ) through which the strip ( 13 ) to be produced is extracted upward, said strip ( 13 ) being formed by the union of two semi-skins which are formed on the respective surfaces of said rolls ( 11 ) and are joined together in correspondence with a line of contact ( 30 ), the device being characterized in that it comprises shearing means ( 27 ) arranged in cooperation with the periphery of said rolls ( 11 ) and able to perform a sectioning action on said strip ( 13 ) to define at least the width of said strip ( 13 ) extracted from said rolls ( 11 ).  
     
     
         13 . Device as in    claim 12   , characterized in that said shearing means ( 27 ) have a cutting edge positioned at least partly between said line of contact ( 30 ) of the semi-skins and the highest end of said rolls ( 11 ).  
     
     
         14 . Device as in    claim 13   , characterized in that said cutting edge ( 29 ) is arranged substantially orthogonal to the front edge of the strip ( 13 ) emerging from said rolls ( 11 ).  
     
     
         15 . Device as in    claim 13   , characterized in that said cutting edge ( 129 ) is arranged inclined with respect to the front edge of the strip ( 13 ) emerging from said rolls ( 11 ).  
     
     
         16 . Device as in    claim 13   , characterized in that said cutting edge is curved.  
     
     
         17 . Device as in    claim 12   , characterized in that said shearing means ( 27 ) are of the laser type.  
     
     
         18 . Device as in    claim 12   , characterized in that said shearing means ( 27 ) are of the oxygen lance type.  
     
     
         19 . Device as in    claim 12   , characterized in that said shearing means ( 27 ) are arranged resting on the ends of the respective rolls ( 11 ) which perform a reference function for said means ( 27 ).  
     
     
         20 . Device as in    claim 12   , characterized in that said shearing means ( 27 ) are able to slide along the rolls ( 11 ) parallel to their longitudinal axis and have at their lower part a shaped conformation able to cooperate with the curved cavity defined by the surfaces of the adjacent rolls ( 11 ).  
     
     
         21 . Device as in    claim 12   , characterized in that it comprises anti-sticking means arranged in cooperation with the ends of the rolls ( 11 ) and able to prevent the metal from sticking to said ends.  
     
     
         22 . Device as in    claim 21   , characterized in that said anti-sticking means are arranged, inside respective rolls ( 11 ), in a compartment ( 32 ) made in proximity with said ends.  
     
     
         23 . Device as in    claim 22   , characterized in that said anti-sticking means comprise a high frequency mechanical transducer ( 31 ).  
     
     
         24 . Device as in    claim 22   , characterized in that said anti sticking means comprise means ( 34 ) to generate high frequency or pulsing electromagnetic waves which act on said ends of said rolls ( 11 ), generating a repulsive action for the metal and causing said metal to re-melt.  
     
     
         25 . Device as in    claim 22   , characterized in that said anti-sticking means comprise pneumatic means ( 35 ) able to deliver jets of inert gas through holes on said ends of said rolls ( 11 ), the jets of gas preventing the solidified metal from coming into contact with and sticking to said ends in order to facilitate the subsequent shearing operation.