Cold Rolling Presetting of Work Roll Bending Force
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Solution Overview
Problem
Existing methods for presetting work roll bending force in cold rolling mills often result in inappropriate values during material type changes or after roll replacements, leading to shape discrepancies and rolling troubles.
Innovation Solution
A method that calculates an appropriate preset value for work roll bending force by using input data to model the mechanical plate crowns and thermal expansion, minimizing the difference between predicted and target values to ensure accurate shaping during cold rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a preset value of work roll bending force is set using conventional methods, then the cold rolling process can be initiated, but the preset value may be away from the appropriate value during material type changes or after roll replacement, leading to shape discrepancies
Solution Approach 1:
The patent applies preliminary action by calculating the preset value of work roll bending force before cold rolling starts. The system computes the preset value based on a model that incorporates rolling load, thermal expansion, and mechanical plate crown information from past rolling operations. This advance calculation ensures the preset value is appropriate for the specific material and conditions, preventing shape discrepancies before they occur during material type changes or after roll replacement.
Solution Approach 2:
The patent implements feedback by using actual data from past cold rolling operations (rolling load, thermal expansion amounts, mechanical plate crowns) to refine the preset value calculation. The model learns from historical performance and adjusts the preset value accordingly, creating a closed-loop system that continuously improves accuracy based on actual rolling outcomes and shape measurements.
2Productivity
If the preset value is away from the appropriate value, then the cold rolling can proceed, but the difference between the shape of the tip end of the rolled stock and the target shape increases, leading to rolling trouble and quality abnormality
Solution Approach 1:
The system performs preliminary calculation of the preset value using a comprehensive model that considers rolling load, thermal expansion, and mechanical plate crown effects before the cold rolling starts. This advance preparation ensures high shape accuracy from the beginning of each rolling operation, eliminating the need for subsequent adjustments and maintaining both productivity and precision throughout the process.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the preset value based on varying conditions such as material type, rolling load, and thermal expansion characteristics. The model calculates optimal parameters for each specific rolling scenario, allowing the system to maintain high shape accuracy across different materials and operating conditions without sacrificing productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method allows for precise setting of work roll bending force, reducing the need for subsequent adjustments and improving the consistency of rolled stock shape.
Implementation Method 1
a ratio of a mechanical plate crown to a width center plate thickness, which is a value obtained by dividing the mechanical plate crown by the width center plate thickness
Implementation Method 2
a prediction value or an actual value of a width distribution of a thermal expansion amount at the work roll in the cold rolling performed in the past
Data Source
AI summary
A preset value of at least one setting value in a shape control actuator included in a cold rolling mill is calculated by a presetting method. In the presetting method, an MC actual value for cold rolling performed in the past is calculated. In the presetting method, an MC target value in a rolled stock to be manufactured by the cold rolling to be performed next is calculated based on the MC actual value. In the presetting method, the setting value is selected so that a difference between an MC prediction value in the cold rolling to be performed next and the MC target value is minimized, and the selected setting value is set as the preset value.