Rolling Mill Force-Balance Control for Precise Strip Wedge
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Solution Overview
Problem
Existing rolling technologies face limitations in precisely controlling strip wedges, leading to instability and asymmetry in rolled materials due to inadequate leveling control and roll position accuracy.
Innovation Solution
A rolling mill configuration with a pair of upper and lower work rolls, supported by roll chocks that can be positionally adjusted using pressing devices, which measure and control pressing forces to maintain a predetermined difference between work-side and drive-side forces, ensuring precise control of strip wedges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional leveling control by adjusting reduction devices above chocks is used, then some strip wedge control is achieved, but precise control of strip wedges on both work side and drive side is limited and control becomes unstable
Solution Approach 1:
The invention divides the roll chock positioning system into independent work-side and drive-side pressing devices, allowing separate control of strip wedges on both sides. Each pressing device independently adjusts the position of its respective roll chock based on measured pressing forces, enabling precise and stable control of strip wedges without the limitations of conventional centralized reduction device control.
2Manufacturing precision
If roll cross angles are adjusted to set values using geometric computation, then strip wedge control is attempted, but backlashes in the facility prevent accurate roll position setting and intended cross angles are not achieved
Solution Approach 1:
The invention implements a feedback control system where pressing devices measure actual pressing forces on roll chocks and use this information to automatically adjust roll chock positions. This closed-loop control compensates for backlashes and mechanical clearances in the facility, ensuring that the intended roll positions and cross angles are accurately achieved despite mechanical imperfections in the equipment.
3Manufacturing precision
If pressing devices are provided on entry side and exit side of roll chocks to measure pressing forces, then precise control of strip wedges is achieved, but device complexity increases
Solution Approach 1:
The pressing devices serve multiple functions: they measure pressing forces on roll chocks, provide positioning control for the rolls, and enable feedback control for strip wedge management. By combining measurement and control functions in a single integrated system, the invention achieves precise strip wedge control without proportionally 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
This configuration allows for more precise and stable control of strip wedges, reducing the occurrence of strip movement and thickness differences, thereby enhancing the quality and consistency of rolled materials.
Implementation Method 1
measuring first pressing forces acting on the roll chocks
Implementation Method 2
changing positions of the roll chocks in the rolling direction
Data Source
AI summary
A control device 20 obtains second pressing forces acting on work-side and drive-side roll chocks 112A and 112B on the basis of entry side and exit side first pressing forces, and controls at least one of work roll position control devices 140B and 141B and at least one of work roll pressing devices 130B and 131B changing a position of at least one of the roll chocks 112A and 112B in such a manner that a difference between the work-side second pressing force and the drive-side second pressing force is equal to or smaller than a predetermined value.