Rolling Mill Roll Chock Alignment Using Torque and Load 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 friction changes, which are not effectively addressed by prior methods.
Innovation Solution
A method and apparatus for setting a rolling mill that includes torque measurement, vertical roll load measurement, pressing, and roll chock driving systems to adjust roll chock positions based on torque and load differences, ensuring minimal torque and load imbalance, thereby eliminating inter-roll thrust forces and stabilizing the rolling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thrust counterforce measurement is performed during rolling to identify asymmetric deformation, then zigzagging control can be implemented, but measurement accuracy deteriorates due to changing working points under varying rolling conditions
Solution Approach 1:
The patent performs thrust counterforce measurements during a preliminary run-out period before actual rolling, when the rolls are rotating without workpiece contact. This preliminary measurement establishes baseline characteristics that are then used to correct measurements taken during rolling, eliminating the problem of changing working points affecting accuracy.
Solution Approach 2:
The system uses feedback by comparing thrust counterforce measurements from the run-out period with those from rolling operation. The difference between these measurements is used to calculate correction values that are applied to improve the accuracy of asymmetric deformation identification during actual rolling.
2Reliability
If roll skew angle is measured using distance sensors to calculate thrust force, then zigzagging control can be implemented, but measurement accuracy deteriorates due to roll vibration and chock position fluctuations
Solution Approach 1:
The patent introduces thrust counterforce measurement as an intermediary parameter that is easier to measure accurately than roll skew angle. Instead of directly measuring the difficult-to-obtain roll skew angle under vibration conditions, the system measures the thrust counterforce which can be obtained more reliably, and uses this as the basis for calculating asymmetric deformation.
3Manufacturing precision
If reduction position is adjusted based on thrust counterforce measurement to perform leveling control, then camber control can be implemented, but control accuracy deteriorates due to friction changes and asymmetric deformation
Solution Approach 1:
The system implements feedback control by continuously monitoring thrust counterforce during rolling and comparing it with baseline values from the run-out period. Based on the detected changes and calculated asymmetric deformation, the system automatically adjusts reduction positions to compensate for camber and zigzagging, improving both accuracy and stability.
Data Source
AI summary
A method for setting a rolling mill, the method being executed before reduction position zero point adjustment or before the start of rolling, and including: a first process of setting rolls in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, adjusting positions of roll chocks in a rolling direction based on a torque acting on the work roll or a vertical roll load difference; and a second process of, after the first process, setting rolls in a kiss roll state, measuring a vertical roll load in two rotational states on a work side and a drive side, and moving roll chocks of a roll assembly on the opposite side to a reference roll simultaneously and in a same direction so that the vertical roll load difference falls within an allowable range to thereby adjust the positions of the roll chocks.