Rolling Mill and Method for Controlling a Rolling Mill

Abstract

A rolling mill, in particular, a cold strip tandem rolling mill, for producing a metal strip, with a number of stands is arranged in a tandem path, wherein, in a direction of production of the metal strip, a first stand is designed as driving stand and serves as inlet for a section of the tandem path, in which a primary thickness reduction of the metal strip occurs, and by corresponding control of the driving stand, an increase in the mechanical inlet tension of the metal strip can be achieved. In a method for controlling a rolling mill, in particular, a cold strip tandem rolling mill, for producing a metal strip, in a production direction of the metal strip, a first stand is controlled as driving stand, the driving stand achieving a significant increase in the mechanical inlet tension on the metal strip and a significant thickness reduction of the metal strip.

1 . A rolling mill, in particular a cold-strip tandem rolling mill for the production of a metal strip, comprising a plurality of stands arranged in a tandem mill train, wherein a first stand in a production direction of the metal strip is designed as a driving stand and serves as the entry for a section of the tandem mill train in which a main thickness reduction of the metal strip takes place, and wherein an increase in a mechanical entry tension of the metal strip being achievable by means of a corresponding activation of the driving stand. 
   
   
       2 . The rolling mill according to  claim 1 , wherein a thickness reduction of the metal strip is implementable by means of the driving stand, but this thickness reduction being dispensed with essentially in favor of an increase in the mechanical entry tension of the metal strip. 
   
   
       3 . The rolling mill according to  claim 1 , wherein, the driving stand or at least one of its supporting and working rolls are, during the rolling of the metal strip, at least partially one of:
 drivable in the production direction of the metal strip, this drive being lower than that of a stand following in the production direction;   operable as a generator; and   drivable opposite to the production direction.   
   
   
       4 . The rolling mill according to  claim 3 , wherein the driving stand is operable in such a way that essentially no slip occurs between a working roll of the driving stand and the metal strip. 
   
   
       5 . The rolling mill according to  claim 1 , wherein a second stand in the production direction of the metal strip is designed as a first actively rolling roll stand, by means of which a first substantial thickness reduction of the metal strip can be implemented. 
   
   
       6 . The rolling mill according to  claim 5 , wherein the rolling mill having downstream of the first actively rolling roll stand in the production direction of the metal strip at least one following actively rolling roll stand. 
   
   
       7 . The rolling mill according to  claim 1 , wherein the rolling mill has no assembly preceding the tandem mill train and has an action increasing the strip tension, or at least one of no S-roller arrangement, no tension bridle and no two-high stand. 
   
   
       8 . The rolling mill according to  claim 1 , wherein the rolling mill has directly upstream of the entry stand, opposite to the production direction of the metal strip, with the exception of a deflecting roller, an uncoiler. 
   
   
       9 . The rolling mill according to  claim 1 , wherein a last stand of the rolling mill is designed as a driving stand. 
   
   
       10 . The rolling mill according to  claim 10 , wherein the first stand and the last stand are operable alternately as a driving stand and as an actively rolling roll stand for a reversing operation of the rolling mill. 
   
   
       11 . A retrofitted rolling mill or a retrofitted cold-strip tandem rolling mill, the retrofitted rolling mill implemented having upstream of a tandem mill train in the production direction of a metal strip no assembly with the function of increasing the strip tension, and the retrofitted rolling mill being designed as claimed in  claim 1 . 
   
   
       12 . The retrofitted rolling mill according to  claim 11 , wherein an assembly with the function of increasing the strip tension is demounted. 
   
   
       13 . A roll installation or rolling mill train, in particular a cold rolling installation or cold rolling mill train, comprising a rolling mill, preferably a cold-strip tandem rolling mill, as claimed in  claim 1 . 
   
   
       14 . A method for activating a rolling mill, in particular a cold-strip tandem rolling mill, for the production of a metal strip, the method comprising the step of:
 activating a first stand in a production direction of the metal strip as a driving stand, wherein a significant increase in the mechanical entry tension for the metal strip takes place by means of the driving stand, on the one hand, and, on the other hand, no appreciable thickness reduction of the metal strip is carried out.   
   
   
       15 . The method according to  claim 14 , wherein the driving stand or at least one of its supporting and working rolls are, during the rolling of the metal strip, at least partially one of:
 driven in the production direction of the metal strip, this drive preferably being lower than that of a stand following in the production direction;   operated as a generator; and   driven opposite to the production direction.   
   
   
       16 . The method according to  claim 14 , wherein the driving stand in the production direction of the metal strip is operated in such a way that essentially no slip occurs between a working roll of the driving stand and the metal strip. 
   
   
       17 . The method according to  claim 14 , wherein a second stand in the production direction of the metal strip is designed as a first actively rolling roll stand, by means of which a first substantial thickness reduction of the metal strip is carried out. 
   
   
       18 . The method according to  claim 14 , wherein a last stand of the rolling mill is designed as a driving stand. 
   
   
       19 . The method as claimed in  claim 18 , the first stand and the last stand is operated alternately as a driving stand and as an actively rolling roll stand for a reversing operation of the rolling mill. 
   
   
       20 . A method comprising the step of using a first stand, in a production direction of a metal strip, of a rolling mill, or a cold-strip tandem rolling mill, as a driving stand for the rolling mill, wherein a significant increase in the mechanical entry tension for the metal strip takes place by means of the driving stand. 
   
   
       21 . The method according to  claim 20 , wherein the driving stand is designed as a first stand in a production direction of the metal strip and serves as the entry for a section of the tandem mill train in which a main thickness reduction of the metal strip takes place, and wherein an increase in a mechanical entry tension of the metal strip being achievable by means of a corresponding activation of the driving stand. 
   
   
       22 . The method according to  claim 20 , wherein the rolling mill being operated or being operable by means of a method comprising the step of:
 activating a first stand in a production direction of the metal strip as a driving stand, wherein a significant increase in the mechanical entry tension for the metal strip takes place by means of the driving stand, on the one hand, and, on the other hand, no appreciable thickness reduction of the metal strip is carried out.