Rolling Stock Speed Estimation via Dynamic Lead Factor
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Solution Overview
Problem
Existing methods for determining the rolling stock speed on the outlet side in a roll stand are inadequate due to unreliable direct measurement techniques, which lead to inaccurate roll gap control and suboptimal rolling results.
Innovation Solution
A method that estimates the rolling stock speed on the outlet side by using a modeled speed based on roll speed and a dynamically adapted lead factor, calculated from a basic value and correction values derived from measured data during the rolling process, to improve the accuracy of roll gap control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct measurement methods (lasers or pulse generators on rollers) are used to determine rolling stock speed on the outlet side, then speed measurement is achieved, but measurement precision deteriorates due to interference and inadequate results
Solution Approach 1:
The patent uses an intermediary approach by measuring the speed of the rolling stock indirectly through the speed of the rolls and a calculated lead factor, rather than directly measuring the rolling stock speed. This intermediary measurement method avoids the interference problems of direct measurement while still providing the necessary speed data for control purposes.
Solution Approach 2:
The patent replaces the mechanical direct measurement system (lasers or pulse generators on rollers) with a computational approach using a model that calculates rolling stock speed from roll speed and lead factor. This substitution eliminates the measurement interference issues while maintaining the functional capability.
2Productivity
If a modeled rolling stock speed is used before direct measurement is available, then roll gap control can proceed, but manufacturing precision deteriorates due to estimation errors
Solution Approach 1:
The patent applies preliminary action by calculating a modeled rolling stock speed using roll speed and lead factor before direct measurement is available. This allows the roll gap control process to proceed without interruption, maintaining productivity while the estimation is later refined when actual measurements become available.
Solution Approach 2:
The patent implements feedback by continuously updating the lead factor based on the difference between modeled and actually measured rolling stock speeds. This feedback mechanism progressively improves the accuracy of the speed estimation, thereby enhancing manufacturing precision over time.
3Manufacturing precision
If the lead factor is dynamically adapted using measured values, then manufacturing precision improves, but device complexity increases due to additional calculation requirements
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the lead factor based on measured rolling stock speeds. This adaptive parameter modification improves the accuracy of the speed estimation model without requiring fundamental changes to the control system architecture, thus limiting the increase in device complexity.
Data Source
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AI summary
In a method for determining an outlet-side rolling-material velocity (v1) from a roll velocity (vw) and a forward slip (s') associated therewith in a roll stand (4) having a mass flow controller (10) that processes the rolling-material velocity (v1), the forward slip (s') is calculated from a base value (sG) and a correction value (sK), and the correction value (sK) is determined using a measured value (M) determined during the rolling process.