Rolling Mill Chock Position Control for Thrust Force Balance
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Solution Overview
Problem
Existing rolling mill technologies face challenges in accurately measuring and controlling thrust forces between rolls, leading to zigzagging and camber issues due to asymmetric deformation and changing friction coefficients, which complicates reduction leveling and inter-roll cross angle corrections.
Innovation Solution
A rolling mill with a measurement apparatus to measure rolling direction forces on both work and drive sides, a pressing apparatus to adjust roll chocks, and a position control unit to synchronize the positions of roll chocks relative to a reference roll, ensuring rolling direction force differences fall within an allowable range, thereby reducing inter-roll thrust forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thrust counterforce measurement is performed during rolling to control reduction position, then reduction leveling control can be performed, but measurement accuracy deteriorates due to changing rolling conditions and friction coefficients
Solution Approach 1:
The patent applies preliminary action by measuring the thrust counterforce before rolling starts (during the setup phase) rather than during rolling. This allows obtaining accurate measurement values when rolling conditions are stable and friction coefficients are consistent, avoiding the measurement errors that occur when conditions change during actual rolling operations
2Manufacturing precision
If roll skew angle is measured using distance sensor to calculate thrust force, then zigzagging control can be performed, but measurement accuracy deteriorates due to roll vibration and chock position fluctuations
Solution Approach 1:
The patent extracts the measurement from the problematic rolling environment by measuring thrust counterforce during the setup phase before rolling begins, rather than measuring roll skew angle during rolling when vibration and position fluctuations occur. This separates the measurement process from the harmful dynamic conditions
3Object-affected harmful factors
If roll chock positions are adjusted to eliminate inter-roll cross angles, then thrust force reduction can be achieved, but device complexity increases due to additional measurement and control systems
Solution Approach 1:
The patent applies self-service by using the rolling mill's own thrust counterforce measurement capability during setup to automatically determine and adjust roll chock positions. The system uses its inherent measurement function rather than requiring external complex measurement equipment, making the control system self-sufficient
Data Source
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AI summary
A rolling mill of four-high or more is provided that includes: measurement apparatuses that adopt any one roll as a reference roll, and measure at least rolling direction forces acting on roll chocks on a work side and roll chocks on a drive side of each roll other than a backup roll; pressing apparatuses that are provided on either one of an entrance side and an exit side in a rolling direction of the roll chocks, and that press the roll chocks in the rolling direction; driving apparatuses that are provided so as to face the pressing apparatus in the roll chocks, and that move the roll chocks in the rolling direction; and a position control unit that fixes a rolling direction position of the roll chocks of the reference roll as a reference position, and drives the driving apparatuses to control the positions in the rolling direction of the roll chocks based on a rolling direction force difference that is a difference between a rolling direction force on the work side and a rolling direction force on the drive side so that the rolling direction force difference of each roll is a value within an allowable range.