Method for processing rolled stock in a rolling mill

Abstract

The method involves performing rolling torque-pre control of a drive by a torque-forming current (I), which is supplied to the drive, for reducing a rotational speed undershoot of the drive, where the rotational speed undershoot is caused by an anticipated load torque acting on the drive. The load torque caused by a rolling process is precontrolled in the drive. The current is stepwise increased for precontrolling the drive. The load torque is corrected by evaluation of rotational speed or torque actual values.

Description

technical field [0001] The invention relates to a method for processing rolling stock in a rolling mill having at least one rolling stand with a drive. Background technique [0002] When processing rolling stock, for example steel or various metals in the form of so-called slabs or slabs, the rolling stock passes through a rolling train with one or more rolling stands. The individual rolling stands each have a drive for a roll with which the rolling stock is rolled to form a sheet or wire having a desired geometry, such as a predetermined thickness or cross-section. [0003] To achieve this, the rolls must be adjusted to a defined rotational speed with the aid of the drives of the individual rolling stands. It is important here that the predetermined proportions of the rotational speeds of the rolls of the individual rolling trains also remain constant during the entire operation of the rolling train, since otherwise tensile and compressive loads would occur on the rolling ...

AI Technical Summary

Problems solved by technology

This results in the rotational speeds of the individual drives or rollers being out of sync, i.e. no longer working with each other at the preset rotational speed ratio

This leads to errors in the material thickness and, in the case of impermissible tensile or compressive loads, to breakage of the wire between the individual rolling stands or to knots in the rolled stock

[0007] For this reason, with the previously known rotational speed control devices with partially superimposed correction switching devices, the behavior of the entire system, that is to say the behavior of the individual drives of the rolling stand or of the rolls and their influence on the rolling result is no longer is predictable, so that the quality of the rolled stock can no longer meet the requirements

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