Temper Rolling Load Control for Plasticity Coefficient Variation
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Solution Overview
Problem
Existing methods for controlling the elongation rate of steel sheets in temper rolling mills fail to accurately account for variations in the plasticity coefficient of the steel, leading to prolonged convergence times to the target value, especially when the plasticity coefficient varies significantly.
Innovation Solution
A rolling control device and method that updates the preset load value based on real-time operation results to adjust for changes in the plasticity coefficient, using evaluation indices to determine when and how to recalibrate the target rolling load, ensuring precise control of the elongation rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the plasticity coefficient is estimated before the rolling load becomes the preset value, then the correction amount can be derived, but the estimated value may differ significantly from the actual value causing excessive reduction amount and prolonged convergence time
Solution Approach 1:
The patent performs preliminary derivation of the plasticity coefficient before the rolling load reaches the preset value, but then uses feedback control to continuously update and correct the correction amount based on actual measured values, ensuring accuracy while maintaining timely response
Solution Approach 2:
The patent implements feedback control by continuously monitoring the actual rolling load and elongation rate, comparing them with target values, and dynamically adjusting the correction amount based on the deviation, which resolves the contradiction between early estimation and accurate control
2Manufacturing precision
If the temper rolling mill reduces the steel sheet to achieve the corrected rolling load based on estimated plasticity coefficient, then the rolling load correction can be applied, but the reduction amount becomes excessively large when the estimated coefficient is too high
Solution Approach 1:
The patent uses feedback control to continuously monitor the actual elongation rate and rolling load, comparing them with target values, and dynamically adjusting the correction amount to prevent excessive reduction while maintaining control precision
Solution Approach 2:
The patent dynamically adjusts the correction amount based on real-time measured values of rolling load and elongation rate, making the control system adaptive to actual conditions rather than relying solely on static estimated values
Data Source
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AI summary
A rolling control device (10) updates a preset load value Pset based on operation actual results at timings ta to tb. The rolling control device (10) derives a plasticity coefficient Qchk based on operation actual results at timings tb to tc. When the determining that it is necessary to re-update the updated preset load value Pset based on the plasticity coefficient Qchk, the rolling control device (10) updates the preset load value Pset again based on the operation actual results at the timings tb to tc.