Backup Roll Thrust Working Point Identification in Rolling Mills
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Solution Overview
Problem
Existing methods for identifying thrust counterforce working point positions in rolling mills, particularly on backup rolls, are limited and can only be performed during roll changes, making them inefficient and inaccurate, especially due to fluctuations in rolling loads and the difficulty in isolating thrust forces as disturbances.
Innovation Solution
A method that involves causing thrust forces to act between rolls by changing friction coefficients or inter-roll cross angles, allowing for the measurement of thrust counterforces and backup roll counterforces, and using equilibrium conditional expressions to identify the thrust counterforce working point positions, even during idling times of the rolling mill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thrust counterforce working point positions are identified using existing methods during roll changes, then measurement can be performed, but productivity is reduced because it can only be done during roll changes
Solution Approach 1:
The patent applies preliminary action by pre-identifying thrust counterforce working point positions during roll changes when the rolling mill is already stopped, and storing these identification results for reuse during subsequent rolling operations. This allows the identification to be performed in advance rather than requiring stoppage during normal production, thereby resolving the contradiction between measurement precision and productivity.
2Productivity
If thrust forces are measured during rolling operations, then productivity is maintained, but measurement precision deteriorates due to fluctuations in rolling loads
Solution Approach 1:
The patent uses an intermediary approach by introducing a mathematical model that separates thrust force components from total rolling load. The model identifies thrust counterforce working point positions by analyzing the relationship between measured rolling loads and calculated thrust forces, effectively filtering out the interference of fluctuating rolling loads. This allows accurate identification during normal rolling operations without requiring stoppage, resolving the contradiction between productivity and measurement precision.
3Measurement precision
If backup roll counterforces are measured to identify thrust counterforce working point positions, then measurement precision is improved, but device complexity increases due to additional measurement requirements
Solution Approach 1:
The patent applies universality by designing the measurement system to serve multiple functions: the same backup roll counterforce measurement装置 is used both for identifying thrust counterforce working point positions and for controlling reduction positions during rolling. By making the measurement system multi-functional, the patent avoids adding dedicated specialized equipment, thereby improving measurement precision without significantly increasing device complexity.
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
Enables accurate and efficient identification of thrust counterforce working point positions on backup rolls at various levels of thrust force, improving the precision of reduction position setting and control during rolling, even outside regular roll change times.
Implementation Method 1
frictional force due to these perpendicular-direction loads can be part of the thrust counterforce
Data Source
AI summary
There is provided a method for identifying thrust counterforce working point positions of backup rolls of a rolling mill, the method including: changing at least either friction coefficients and inter-roll cross angles between the rolls with an unchanged kiss roll load to cause thrust forces at a plurality of levels to act between the rolls, and measuring thrust counterforces in a roll-axis direction acting on rolls forming at least one of roll pairs other than a roll pair of the backup rolls and measuring backup roll counterforces acting in a vertical direction on the backup rolls at reduction support positions in a kiss roll state; and identifying, based on the measured thrust counterforces, thrust counterforce working point positions of thrust counterforces acting on the backup rolls, using first equilibrium conditional expressions relating to forces acting on the rolls and second equilibrium conditional expressions relating to moments acting on the rolls.