Simple pre-control of a wedge-type roll-gap adjustment of a roughing stand

Patent metadata

Field	Value
Publication number	US-10456818-B2
Application number	US-201515120726-A
Country	US
Kind code	B2
Filing date	Jan 21, 2015
Priority date	Feb 21, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A plurality of flat metal items to be rolled ( 3 ) are fed to a plurality of rolling stands ( 1, 2 ) of a rolling installation, one after the other over a feed path ( 4 ). The items ( 3 ) are rolled by the rolling stands ( 1, 2 ) past which they are fed. In the rolling stands ( 1, 2 ), the flat item to be rolled ( 3 ) is first rough-rolled in at least one roughing pass with a wedge-type roll gap adjustment (ds) and then finish-rolled in finishing passes. After the finish-rolling of the flat item, a thickness taper (dd) that is present in the respective finish-rolled flat item is recorded by measuring instruments. The thickness taper (dd) is compared with a target taper (dZ). On the basis of a deviation of the thickness taper (dd) from the target taper (dZ) and the wedge-type roll gap adjustment (ds), a new wedge-type roll gap adjustment (ds) is determined for the at least one roughing pass. The wedge-type roll gap adjustment (ds) for the at least one roughing pass for the next flat item to be rolled ( 3 ) is set to correspond to the newly determined value of the wedge-type roll gap adjustment (ds), so that the next flat item to be rolled ( 3 ) is rough-rolled in the at least one roughing pass with the newly determined value of the wedge-type roll gap adjustment (ds).

First claim

The invention claimed is:

1. An operating method for a rolling mill processing in succession a plurality of flat items of metal rolling stock, the method comprising:
feeding a first flat item of the plurality of flat items through a plurality of roll stands of the rolling mill via a first feed path;
roughing down the first flat item in at least one stand of the plurality of roll stands during at least one roughing pass with a first value of a wedge setting then finish-rolling the roughed down first flat item in finishing passes;
registering a first thickness wedge produced for the first flat item after the finish-rolling of the first flat item;
comparing the first thickness wedge of the first flat item with a first target wedge, and determining a deviation of the first thickness wedge from the first target wedge;
based on the deviation and on the first value of the wedge setting, determining a new value of the wedge setting for the at least one roughing pass;
adjusting the wedge setting in the course of the at least one roughing pass in accordance with the new value of the wedge setting for a next flat item of the plurality of flat items to be rolled next, so that the next flat item is roughed down in the at least one roughing pass with the new value of the wedge setting; and
during the roughing down of the plurality of flat item in one of the roll stands, placing lateral guides and/or edgers against the flat items in front or upstream of and/or behind or downstream of the roll stand, such that the lateral guides and/or edgers exert transverse forces on the respective flat items of rolling stock for preventing a saber-type formation in the rolling stock in the course of roughing down;
wherein the adjusting of the wedge setting is such that the wedge setting is proportional to the thickness wedge existing in the finish-rolled respective flat item.

2. The operating method as claimed in claim 1 , wherein the wedge setting is adjusted such that the wedge setting increases monotonically with the ratio of a mean rolling-stock thickness of the respective flat item after the roughing down and after the finish-rolling.

3. The operating method as claimed in claim 1 , further comprising controlling roll alignment during the rolling of a respective flat item.

4. The operating method as claimed in claim 1 , further comprising:
feeding a second plurality of flat items of rolling stock in succession to the plurality of roll stands via a second feed path;
roughing down a first flat item of the second plurality of flat items of rolling stock by at least one roughing pass having a second value for the wedge setting, and then finish-rolling the second flat item in finishing passes;
wherein the finish-rolling of the respective second flat item of rolling stock causes a second thickness wedge to exist in the finish-rolled respective second flat item, and registering the second thickness wedge by applied metrology;
comparing the second thickness wedge with a second target wedge to calculate a deviation of the second thickness wedge from the second target wedge;
based on the deviation and on the second value of the wedge setting, determining a new value for the second wedge setting for the at least one roughing pass; and
adjusting the wedge setting in the course of the at least one roughing pass for second flat item of the second plurality of flat items to be rolled next in accordance with the new value of the wedge setting, so that the next second flat item new value of the wedge setting.

5. A non-transient computer-readable medium product incorporating a computer program code configured to control a rolling mill, the program code configured, when executed by a control device, to operate the rolling mill in accordance with the operating method as claimed in claim 1 .

6. A control device of a rolling mill, wherein the control device incorporates the computer program of the computer program product claimed in claim 5 .

7. A rolling mill for processing a plurality of flat items of metal rolling stock, the rolling mill comprising:
the rolling mill including a first feed path, via which a plurality of first flat items of rolling stock made of metal are fed in succession to a plurality of roll stands of the rolling mill;
the rolling mill includes a plurality of roll stands configured for rolling the plurality of flat items,
wherein a first flat item of the plurality of flat items is roughed down in at least one stand of the plurality of roll stands in at least one roughing pass with a first value of a wedge setting and then the first flat item is finish rolled in finishing passes;
the rolling mill including a thickness-measuring device configured to measure a thickness of the first flat item after the finish-rolling of the first flat item,
wherein a first thickness wedge in the finish-rolled first flat item is registered by applied metrology;
wherein the rolling mill includes, in front or upstream of and/or behind or downstream of the roll stand, for carrying out the at least one roughing pass, lateral guides and/or edgers which, during the roughing down of the first flat item, are placed against this roll stand to exert transverse forces on the first flat item, which forces are directed and applied to prevent a saber-type formation in the course of the roughing down; and
a control device configured to control operation of the rolling mill including the roll stands so as to adjust the first wedge setting in the course of the at least one roughing pass in accordance with a new value of the wedge setting, for a next flat item of the plurality of flat items to be rolled next, so that the next flat item is roughed down in the at least one roughing pass with the new value of the wedge setting,
wherein the new value is determined by comparing the first thickness edge of the first flat item with a first target wedge, and determining a deviation of the first thickness wedge from the first target wedge;
based on the deviation and on the first value of the wedge setting, determining the new value of the wedge setting for the at least one roughing pass.

Assignees

• Primetals Technologies Germany Gmbh

Inventors

• Kurz Matthias
• Rietbrock Uwe

Classifications

• B21B37/26

  for obtaining one strip having successive lengths of different constant thickness · CPC title

• B21B38/00

  Methods or devices for measuring, {detecting or monitoring} specially adapted for metal-rolling mills, e.g. position detection, inspection of the product {(control devices or methods B21B37/00)} · CPC title

• B21B13/06

  with axes of rolls arranged vertically {, e.g. edgers} · CPC title

• B21B1/463

  in a continuous process, i.e. the cast not being cut before rolling · CPC title

• B21B39/12

  Arrangement or installation of roller tables in relation to a roll stand · CPC title