Method for adjusting the rolls of a roll stand and roll stand

Abstract

A roll stand having at least two interacting working rolls. One of the working rolls is arranged in the roll stand in a displaceable manner for adjusting a roll gap, and the other working roll can be rotated in the roll stand in a working position, but for defining a passline in the direction normal to the surface of the roll material is non-displaceably fixed. To increase rolling accuracy: a) the position of the working roll arranged in a fixed manner in the roll stand is determined; b) the determined value of the position is compared to a target value; c) the working roll fixedly arranged in the roll stand is adjusted depending on the comparison value determined in step b) using at least one adjusting element such that the position of the working roll fixedly arranged in the roll stand at least largely reaches the target value.

I claim: 
     
         1 . A roll stand, comprising: at least two cooperating work rolls, wherein one of the work rolls is mounted movably for adjusting a roll gap, and wherein the other work roll is mounted rotatably in a working position but, for defining a pass line, is held fixedly in a direction perpendicular to a surface of in-process stock during rolling;
 measuring means for determining a position at a reference point on the work roll held fixedly in the roll stand;   comparison means for comparing the determined position value with a nominal value; and   at least one adjusting element operative to adjust a chock of the work roll mounted fixedly in the roll stand as a function of a difference, determined by the comparison means, between the determined value and the nominal value, wherein a pass line for the in-process stock is formed by a topmost point of the lower work roll.   
     
     
         2 . The roll stand according to  claim 1 , wherein the measuring means are positioned to measure the position of a barrel of the work roll. 
     
     
         3 . The roll stand according to  claim 1 , wherein the roll chock comprises a reference point for measurement by the measuring means. 
     
     
         4 . The roll stand according to  claim 1 , wherein the measuring means are mounted permanently in the roll stand. 
     
     
         5 . The roll stand according to  claim 1 , wherein the measuring means are mounted replaceably in the roll stand and used temporarily for measurements. 
     
     
         6 . The roll stand according to  claim 1 , wherein the adjusting element is a tension/compression spindle with a combination of a right-hand and a left-hand thread. 
     
     
         7 . The roll stand according to  claim 1 , wherein the roll stand is a 6-high roll stand. 
     
     
         8 . The roll stand according to  claim 1 , wherein the roll stand is a 20-roll stand. 
     
     
         9 . The roll stand according to  claim 1 , wherein the roll stand is a Z-high roll stand.