Reversing Rolling Mill Thickness Control via Entry Gauge Feedback
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Solution Overview
Problem
Conventional methods for predicting roll force accuracy in reversing rolling mills are inadequate, particularly in head and tail portions, leading to significant thickness deviations and reduced yield due to unstable rolling conditions and inability to measure thicknesses after rolling.
Innovation Solution
A thickness control apparatus for reversing rolling mills that includes entry and delivery thickness gauges, speed detectors, and roll force detection, allowing for real-time thickness tracking and compensation, improving roll force prediction accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant roll force control is performed based on predicted roll force values, then the rolling process can be maintained, but the thickness accuracy deteriorates due to low roll force prediction accuracy
Solution Approach 1:
The patent implements feedback control by measuring actual thickness with thickness gauges and using this information to correct roll force predictions. The system continuously monitors thickness deviations and adjusts subsequent roll force calculations to compensate for prediction errors, thereby improving thickness accuracy while maintaining process continuity.
Solution Approach 2:
The patent performs preliminary thickness measurements using entry thickness gauges before the rolling operation and uses these measurements to pre-correct the roll force predictions. By anticipating thickness deviations through advance measurement and calculation, the system can adjust roll force settings beforehand, improving thickness control accuracy.
2Productivity
If roll force prediction is performed using conventional methods, then the pass schedule can be determined, but the prediction accuracy deteriorates in head and tail portions
Solution Approach 1:
The patent applies different measurement and correction approaches to different portions of the material. Entry thickness gauges specifically measure thickness at the head portion before rolling, and the system performs localized correction calculations for head and tail portions separately from the middle sections, thereby improving prediction accuracy where it is most needed without compromising overall productivity.
3Device complexity
If thickness measurements are not performed in head and tail portions, then the measuring process is simplified, but the roll force prediction accuracy deteriorates
Solution Approach 1:
The patent performs thickness measurements at the entry side before the rolling operation using entry thickness gauges. By measuring thickness in advance at the head portion, the system obtains necessary data for accurate roll force prediction without requiring complex post-rolling measurement systems, thus improving accuracy while keeping the measurement system relatively simple.
Data Source
AI summary
A thickness control apparatus of a reversing rolling mill has an entry thickness gauge that measures the thickness of the material to be rolled, and entry material speed detector that detects the speed of the material to be rolled. Measured thickness measured by the entry thickness gauge is tracked on the basis of the speed of the material to be rolled detected by the entry material speed detector. A mill delivery thickness calculator calculates thickness on the delivery side of the reversing rolling mill on the basis of the thickness on the entry side and the roll gap detected.