Hot Finish Rolling Gain Adjustment for Stable Sheet Passing
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Solution Overview
Problem
Existing methods for controlling hot finish rolling fail to quantitatively monitor control characteristics, leading to unexpected deterioration and sheet passing trouble due to changes in operating conditions and equipment.
Innovation Solution
A method and device for controlling hot finish rolling that includes normalization, comparative evaluation, and gain adjustment of weight gains using an evaluation function, with the aid of a computer system and machine learning, to stabilize control characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight gains are determined by trial and error in conventional control systems, then initial control functionality is achieved, but control characteristics deteriorate due to operating conditions and equipment changes
Solution Approach 1:
The patent implements dynamic adjustment of weight gains Q and R based on real-time operating conditions. The control system continuously monitors process state and automatically recalibrates the weight gains to match current operating conditions, transforming the static trial-and-error approach into a dynamic adaptive system that maintains optimal control characteristics across varying conditions.
Solution Approach 2:
The patent introduces a feedback mechanism where the actual control characteristics are measured and compared against target values. The weight gains are then adjusted based on this feedback to minimize the evaluation function, creating a closed-loop system that automatically corrects deviations caused by operating condition changes without requiring manual intervention.
2Measurement precision
If conventional control systems are used without quantitative monitoring, then simple operation is maintained, but unexpected characteristic deterioration cannot be detected
Solution Approach 1:
The patent introduces an evaluation function as an intermediary that quantifies control characteristics in terms of sheet thickness deviation, tension deviation, and looper angle deviation. This intermediary layer translates complex control system behavior into measurable performance metrics, enabling quantitative monitoring without requiring direct modification of the underlying control mechanisms.
Solution Approach 2:
The patent changes the monitoring approach from qualitative observation to quantitative measurement by defining specific parameters (weight gains Q and R, evaluation function values) that can be precisely measured and compared. This parameter-based monitoring system provides objective criteria for detecting control characteristic deterioration while maintaining systematic simplicity through standardized metrics.
3Manufacturing precision
If weight gains are fixed after initial setup, then system simplicity is maintained, but control accuracy deteriorates when process characteristics change
Solution Approach 1:
The patent implements a self-service control system where the controller automatically adjusts the weight gains Q and R based on real-time process conditions and performance feedback. The system monitors its own control accuracy and autonomously recalibrates the parameters to maintain optimal performance, eliminating the need for external intervention while improving manufacturing precision through continuous adaptation.
Data Source
AI summary
A method of controlling hot finish rolling, in cooperative control of the hot finish rolling, by controlling a rolling state using an evaluation function in which weight gains are set for each of a plurality of state variables and a plurality of manipulated variables and obtaining control gains that minimize the evaluation function, includes: a step of normalizing the weight gains by a normalization unit; a step of performing, by a comparative evaluation unit, comparative evaluation on the weight gains of the state variables after normalization and performing comparative evaluation on the weight gains of the manipulated variables after normalization; and a step of adjusting, by a gain adjustment unit based on a result of the comparative evaluation, at least one of: the weight gains of the state variables; and the weight gains of the manipulated variables.