SIMPLE PRE-CONTROL OF A WEDGE-TYPE ROLL-GAP ADJUSTMENT OF A ROUGHING STAND

摘要

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).

主权项

1. An operating method for a rolling mill comprising:
feeding several first flat items of metal rolling stock in succession through a plurality of roll stands of the rolling mill via a first feed path; rolling the first flat items of rolling stock by the plurality of roll stands; roughing down the respective first flat item of rolling stock in the plurality of roll stands during at least one roughing pass, with a first wedge setting (ds) for the metal stock in at least some of the roll stands; and then finish-rolling the roughed down rolling stock in finishing passes, wherein after the finish-rolling of the respective first flat item of rolling stock produces a first thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock, registering the first thickness wedge by applied metrology; comparing the first thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock with a first target wedge (dZ), and determining a deviation between dd and dZ; based on the deviation of the existing first thickness wedge (dd) from the first target wedge (dZ) and from the first wedge setting (ds) determining a new first wedge setting (ds) for the at least one roughing pass; adjusting the first wedge setting (ds) in the course of the at least one roughing pass in accordance with the newly determined value of the first wedge setting (ds), for the first flat item of rolling stock to be rolled next, so that the first flat item of rolling stock to be rolled next is roughed down in the at least one roughing pass with the newly determined value of the first wedge setting (ds); during the roughing down of the respective first flat item of rolling stock in one of the roll stands, carrying out the at least one roughing pass, placing lateral guides and/or edgers against the rolling stock 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 first flat item of rolling stock for preventing a saber-type formation in the rolling stock in the course of roughing down; and changing (dds) of the wedge setting (ds) proportional to the thickness wedge (dd) existing in the finish-rolled respective first flat item of rolling stock.