Rolling Mill Chock Position Setting for Zigzag and Camber Control
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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 current methods.
Innovation Solution
A method for setting a rolling mill that includes torque measurement, vertical roll load measurement, and a pressing apparatus 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
1Ease of operation
If thrust counterforce measurement is performed during rolling, then zigzagging control can be implemented, but measurement accuracy deteriorates due to changes in working point characteristics depending on rolling conditions
Solution Approach 1:
The patent applies preliminary action by performing thrust counterforce measurement and reduction position adjustment before rolling starts. The reduction position is adjusted to the zero point based on thrust counterforce measured in advance, and then rolling is executed. This eliminates the need to measure thrust counterforce during rolling, avoiding the problem of changing measurement characteristics under different rolling conditions.
2Object-affected harmful factors
If reduction position adjustment is performed based on thrust counterforce, then zigzagging can be suppressed, but device complexity increases due to additional measurement and adjustment mechanisms
Solution Approach 1:
The patent utilizes the existing thrust counterforce measurement capability of the rolling mill's load measurement system and applies it to reduction position adjustment. The same measurement system serves both for monitoring rolling loads and for controlling zigzagging by adjusting reduction positions, eliminating the need for separate dedicated measurement and control devices.
Solution Approach 2:
The reduction position adjustment based on thrust counterforce measurement is performed before rolling starts. By pre-adjusting the reduction position to the zero point using measured thrust counterforce, the system suppresses zigzagging without requiring complex real-time measurement and control mechanisms during the rolling process.
3Manufacturing precision
If roll chock positions are adjusted to eliminate thrust forces, then manufacturing precision improves by reducing asymmetric deformation, but ease of operation decreases due to complex position adjustment procedures
Solution Approach 1:
The patent performs roll chock position adjustment before rolling starts to eliminate thrust forces and asymmetric deformation. By pre-adjusting the reduction position to the zero point based on thrust counterforce measurement, the system ensures manufacturing precision without requiring complex adjustments during operation.
Solution Approach 2:
The system uses thrust counterforce measurement as feedback to determine the appropriate reduction position adjustment. The measured thrust counterforce provides information about the current roll alignment state, and this feedback is used to adjust reduction positions to eliminate thrust forces, ensuring workpiece shape accuracy.
Data Source
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AI summary
[Problem to be Solved] To suppress occurrence of zigzagging and camber of a workpiece. [Solution] A method for setting a rolling mill of four-high or more is provided, in which at least one roll is adopted as a reference roll, 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, measuring a motor torque or a spindle torque in a roll assembly on a side on which a vertical roll load measurement apparatus is installed, measuring a torque acting on a work roll in a roll assembly on a side on which the vertical roll load measurement apparatus is not installed, and thereafter adjusting positions of roll chocks in a rolling direction based on the motor torque or spindle torque and 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 fixing a rolling direction position of roll chocks of the reference roll and moving roll chocks of a roll assembly on the opposite side to the reference roll simultaneously and in a same direction so that the vertical roll load difference falls within a predetermined allowable range to thereby adjust the positions of the roll chocks.