Method and rolling stand for controlling the adjusting cylinders of the rolling stand

By calculating correction values based on rolling stand and metal strip modules, the method addresses imprecision in roll gap control, achieving rapid and stable thickness adjustment with reduced effort, enhancing productivity and stability in rolling mills.

DE102024211380A1Pending Publication Date: 2026-05-28SMS GROUP GMBH
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Patent Information

Application Number
DE102024211380
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

Existing methods for controlling the roll gap in rolling mills are imprecise due to rough estimates of material flow curves, temperatures, and friction, leading to inaccuracies in achieving the desired metal strip thickness, with high dimensional lengths, slow control dynamics, and stability risks.

Method used

A method that calculates position or force correction values using the modules of the rolling stand and metal strip, allowing for rapid and stable adjustment of the adjusting cylinders to achieve precise target thickness without feedback loops, reducing commissioning effort.

Benefits of technology

The method enables quick and stable adjustment of the roll gap, minimizing dimensional lengths and increasing productivity by avoiding undershoots and overshoots, thus improving process stability and reducing saleable defects.

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Abstract

The invention relates to a method for controlling the adjusting cylinders 120 of two work rolls 110 of a rolling mill stand 100, which together form a roll gap for rolling a metal strip. To achieve a predetermined target thickness hX Ref, the adjusting cylinders are controlled by a rolling mill stand control system with pre-calculated initial adjusting positions or adjusting forces. However, during a rolling process, it may become apparent that these initially predetermined adjusting positions or adjusting forces are too inaccurate; they are then changed during the rolling process or during a rolling break according to predetermined correction values.In order to be able to carry out such a necessary change in the actuating force or the actuating position of the actuating cylinders more quickly and at the same time more stably, and also to reduce the commissioning effort, the invention provides that when calculating the position or force correction values ​​for changing the actuating position of the actuating cylinders 120, the module of the rolling stand as well as the module of the metal strip to be rolled are taken into account.
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Citation Information

Patent Citations

  • Control method for dead time subject loops

    EP0575636A1

  • Method for dynamic rolling gap control during flexible rolling of metal strips

    EP3566790A1