Reversible Rolling Mill Width Control During Reverse Pass
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Solution Overview
Problem
Conventional strip width controllers in reversible rolling mills struggle to accurately measure the strip width over the entire length without causing a decrease in production efficiency due to time loss and measurement limitations, particularly during the reverse pass rolling.
Innovation Solution
A strip width controller for a reversible rolling mill that includes a rolling controller, a rolling position detector, a tracker, and a strip width result calculator, which calculates strip width values at multiple positions during reverse pass rolling using constant load control and tracking, and optionally uses strip width meters upstream or downstream to correct these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the strip is conveyed to the width meter installation position after leaving the edger to measure strip width, then the strip width can be measured, but time loss occurs and productivity decreases
Solution Approach 1:
The patent applies preliminary action by measuring the strip width during the reverse pass rolling process, before the strip is conveyed to the width meter installation position. The edger rolls are used to perform width rolling while simultaneously enabling width measurement through load detection, thus acquiring strip width data in advance and eliminating the need for separate measurement at the width meter position.
2Productivity
If the reversing operation is performed immediately after the strip is removed from the edger to improve productivity, then production efficiency increases, but the strip width cannot be measured over the entire length
Solution Approach 1:
The edger rolls are given multi-functionality by making them serve both width rolling and width measurement functions. By detecting the load on the edger rolls during reverse pass rolling, the system can determine strip width while the strip is being processed, thus achieving both productivity improvement and complete width measurement coverage without requiring separate measurement equipment or operations.
3Measurement precision
If the width meter is installed at a position away from the entry side to avoid interference, then measurement accuracy is maintained, but the strip cannot be measured during reverse pass rolling
Solution Approach 1:
The patent replaces the mechanical width measurement system (width meter) with a load detection system on the edger rolls. Instead of using a separate mechanical measurement device positioned away from the entry side, the system uses the load information from the edger rolls during reverse pass rolling to determine strip width, thus eliminating the need for separate measurement equipment and reducing measurement time.
Data Source
AI summary
A strip width controller for a reversible rolling mill includes a rolling controller, a rolling position detector, a tracker, and a calculator. The rolling controller operates an edger so that a pair of edger rolls comes into contact with a strip to be rolled during reverse pass rolling. The rolling position detector detects a rolling position of the edger when the pair of edger rolls are in contact with the strip to be rolled during the reverse pass rolling. The tracker tracks a longitudinal position of the strip to be rolled during the reverse pass rolling. The calculator calculates strip width result values at a plurality of positions in the longitudinal direction of the strip to be rolled based on an output of the rolling position detector and an output of the tracker.