Device and method for the casting of strips from a metal melt, in particular a steel melt

Abstract

A device and a method for casting of strips from a metal melt includes the use of two casting rollers, which delimit between them a casting gap at their longitudinal sides, and two side plates, which, arranged opposite one another, are held in contact at face sides of the casting rollers, allocated to narrow sides in each case of the casting gap. With the device and method, metallic strips can be reliably produced which have high dimensional stability even in the area of their strip edges, in that the risk of a gathering of solidified melt at the side plates in casting operation is reduced to a minimum. This is achieved by providing at least one heating device for the heating of the casting rollers in at least those sections of their face sides at which the side plate, allocated to the face side in each case, is in contact.

1 . Device for the casting of strips from a metal melt with two counter-rotating casting rollers when in casting operation, which delimit between the two counter-rotating casting rollers a casting gap on their longitudinal sides, and with two side plates, which are held opposite one another arranged in contact with face sides of the two-counter-rotating casting rollers allocated to in each case narrow sides of the casting gap, in order to seal the casting gap at the narrow side in each case, wherein at least one heating device is provided for heating the casting rollers in at least those sections of their face sides at which an allocated side plate in each case is in contact. 
   
   
       2 . Device according to  claim 1 , wherein the heating device operates inductively. 
   
   
       3 . Device according to  claim 2 , wherein a maximum penetration depth over which the heating device heats up the section which it heats is restricted to 2 mm. 
   
   
       4 . Device according to  claim 3 , wherein the maximum penetration depth is restricted to 1 mm. 
   
   
       5 . Device according to  claim 2 , wherein a temperature to which the heating device heats up the section of the two counter-rotating casting rollers heated by it in each case lies above the Curie temperature of a material adjacent to the surface of an individual section to be heated in each case. 
   
   
       6 . Device according to  claim 1 , wherein the two counter-rotating casting rollers have on their surface a nickel coating containing iron. 
   
   
       7 . Device according to  claim 6 , wherein an iron content of the nickel coating is varied depending on a heating temperature which is to be set in each case. 
   
   
       8 . Device according to  claim 2 , wherein the heating device comprises at least one inductor and current flowing through the at least one inductor has a frequency of at least 100 Hz. 
   
   
       9 . Device according to  claim 8 , wherein the current has a frequency of at least 1000 Hz. 
   
   
       10 . Method for casting of strip from a metal melt, in which the metal melt is cast into a casting gap, longitudinal sides of the casting gap are delimited by two counter-rotating casting rollers and narrow sides of the casting gap are sealed by side plates being pressed in each case against two face sides of the two counter-rotating casting rollers allocated to individual narrow sides, wherein the two face sides of the casting rollers at least in the area in which they are adjacent to one of the side plates in each case, are heated, limited locally, to a temperature which lies above the surface temperature of the casting rollers outside these areas. 
   
   
       11 . Method according to  claim 10 , wherein the heating takes place inductively. 
   
   
       12 . Method according to  claim 10 , wherein a depth to which the heating takes place is restricted to a maximum of 1. 
   
   
       13 . Method according to  claim 10 , the temperature to which the sections, which are to be heated in each case, of the casting rollers are heated up lies above the Curie temperature of a material of an individual casting roller adjacent to the surface of the section which is to be heated in each case. 
   
   
       14 . Method according to  claim 11 , wherein current flowing to produce the electro-magnetic field during inductive heating has a frequency of at least 100 Hz. 
   
   
       15 . Method according to  claim 14 , wherein the current has a frequency of at least 1000 Hz.