Rolling Stand Strip Alignment Control via Tension Differential
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Solution Overview
Problem
Existing control methods for rolling stands struggle to accurately and efficiently correct lateral meandering of rolled strips, leading to uneven rolling that complicates subsequent processing stages.
Innovation Solution
The method involves using measured-value transducers to detect tensions on both sides of the strip at the feed and exit sides, calculating a transverse positioning measure (δZ=ZLE+ZLA−ZRE−ZRA), and using this measure to determine a correcting variable for the rolling stand to adjust the strip's position, ensuring precise central positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tension differences are used to control strip positioning, then strip alignment is improved, but measurement and control complexity increases
Solution Approach 1:
The strip tension is segmented into four distinct measurement points (left feed side, left exit side, right feed side, right exit side), allowing localized tension detection that simplifies the overall control strategy by breaking down the complex meandering problem into manageable segments
Solution Approach 2:
A mathematical relationship (δZ=ZLE+ZLA−ZRE−ZRA) is introduced as an intermediary that transforms raw tension measurements into a meaningful transverse positioning measure, simplifying the control device's task by pre-processing the measurement data before it reaches the control algorithm
2Measurement precision
If multiple tension measurements are taken, then positioning accuracy is improved, but measurement complexity increases
Solution Approach 1:
Four separate tension measurements are merged into a single transverse positioning measure (δZ) through a mathematical relationship, reducing the complexity of processing multiple measurements while maintaining high measurement precision
Solution Approach 2:
Instead of directly measuring complex strip position and orientation, the system uses tension measurements as indirect copies or proxies that correlate with transverse positioning, simplifying the measurement process while maintaining accuracy
Data Source
AI summary
A strip has a left and a right side. The strip is rolled in a rolling stand. Stresses occurring in the strip at the feed and exit sides are detected by corresponding measuring sensors positioned on the left and right sides of the strip. The detected stresses are fed to a control unit for the rolling stand. The control unit determines a measurement for the transversal positioning of the strip in relation to the rolling stand using the relationship Z=ZLE*ZLA−ZRE−ZRA, where Z is the measurement. ZLE, ZLA, ZRE and ZRA are the individually detected stresses. The control unit determines a correcting variable for correcting the transversal positioning of the strip using the measurement for the transversal positioning and controls the rolling stand according to the correcting variable.