Metal Strip Rolling Exit Temperature Control Without Final-Stand Sensing
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Solution Overview
Problem
In metal strip or sheet production, existing methods struggle to accurately control the temperature profile, especially after the last roll stand, leading to inefficiencies in cooling and quality control due to the inability to measure the final rolling temperature before rapid cooling devices.
Innovation Solution
A method that calculates the temperature at the exit of the last roll stand using a temperature calculation model, based on measurements upstream, and adjusts process parameters such as cooling water supply, induction heating, or strip speed to match predetermined reference values, ensuring precise temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid cooling devices are installed immediately after the last roll stand, then cooling efficiency is improved, but the ability to measure and control the final rolling temperature is lost
Solution Approach 1:
The patent applies preliminary action by measuring the temperature upstream of the last roll stand before the material enters the rolling process. This early measurement allows the system to predict and control the exit temperature through calculation models, enabling temperature control without requiring measurement devices after the rapid cooling section.
Solution Approach 2:
The patent uses a temperature calculation model as an intermediary between the measured upstream temperature and the desired exit temperature control. This computational mediator predicts the exit temperature based on process parameters and upstream measurements, allowing indirect control of the temperature that would otherwise be unmeasurable after rapid cooling.
2Manufacturing precision
If temperature measurement devices are installed after the last roll stand, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a virtual copy of the temperature information by calculating the exit temperature based on upstream measurements and process models. Instead of installing physical measurement devices in difficult-to-access locations, the system generates a computational replica of the temperature data that can be used for control purposes.
Solution Approach 2:
The patent replaces mechanical measurement devices (pyrometers or thermocouples) with a computational approach. Instead of using physical sensors after the last stand, the system uses mathematical models and upstream measurement data to determine and control the exit temperature, substituting mechanical measurement with computational analysis.
3Device complexity
If upstream temperature measurement is used, then device complexity is reduced, but temperature control accuracy deteriorates
Solution Approach 1:
The patent implements feedback control by continuously comparing the calculated exit temperature with target values and adjusting process parameters accordingly. The system uses upstream temperature measurements combined with process models to create a closed-loop control system that maintains temperature accuracy despite the indirect measurement approach.
Solution Approach 2:
The patent applies dynamics by using a dynamic temperature calculation model that adapts to changing process conditions. The model continuously updates temperature predictions based on real-time process parameters such as rolling speed, reduction ratio, and cooling conditions, allowing accurate temperature control despite variations in operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for targeted temperature control and improved quality of metal strips or sheets by enabling online calculation and control of cooling zones, reducing reject material and enhancing product quality.
Implementation Method 1
calculating a temperature for the strip or sheet immediately at the exit of the last stand of the rolling mill by means of a temperature calculation model on the basis of the temperature of the strip or sheet measured upstream of the last stand
Implementation Method 2
cooling water is sprayed at a lower process side of the final stand in a series of hot finishing rolling mills to achieve rapid cooling
Implementation Method 3
cooling water is sprayed... to achieve rapid cooling
Data Source
AI summary
A method for producing a metallic strip or sheet, in which the strip or sheet is rolled in a multi-stand rolling mill and is discharged downstream of the last roll stand of the rolling mill in a conveying direction. The strip or sheet is cooled in the multi-stand rolling mill and/or downstream of the rolling mill as viewed in the conveying direction, wherein a temperature of the strip or sheet is measured upstream of the last roll stand of the rolling mill as viewed in conveying direction. Based on this measured temperature, a temperature for the strip or sheet at the exit of the last roll stand of the rolling mill is then determined by calculation with the aid of a temperature calculation model, with which further temperature processes of the manufacturing method can be controlled or regulated after a comparison with a predetermined reference value.