Cold Tandem Mill Tension Control for High-Speed Vibration Suppression
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Solution Overview
Problem
Cold tandem rolling mills experience vibration issues during high-speed rolling processes, leading to surface quality defects and reduced production efficiency, with existing solutions failing to effectively address these vibrations as a constraint in the optimization of tension systems.
Innovation Solution
A tension system optimization method is developed, which involves acquiring device and process parameters, defining vibration determination indices, and calculating optimal tension values to maintain a stable lubrication state, thereby suppressing rolling mill vibrations. This method calculates the optimal inlet and exit tensions for each machine frame based on specific parameters and thresholds to ensure a stable rolling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rolling speed is increased to improve production efficiency, then productivity increases, but rolling mill vibration occurs leading to surface quality defects
Solution Approach 1:
The patent applies parameter changes by optimizing the tension system parameters (inlet tension T0 and exit tension T1) to suppress vibration during high-speed rolling. The method calculates optimal tension values based on device parameters, process parameters, and a vibration determination index, then adjusts the tension system to these optimized parameters to eliminate vibration while maintaining high rolling speed, thus resolving the contradiction between productivity and surface quality
2Manufacturing precision
If tension system is optimized to suppress vibration, then strip surface quality improves, but the complexity of tension system control increases
Solution Approach 1:
The patent replaces complex mechanical trial-and-adjustment methods with a computer-based calculation system. The control device automatically calculates optimal tension parameters using predetermined formulas based on input parameters and vibration determination indices, then sends these parameters to the tension system for automatic adjustment. This substitution of mechanical control with automated computational control reduces operational complexity while improving surface quality
3Productivity
If rolling speed is increased to meet market demand, then productivity increases, but vibration causes shutdowns reducing effective production time
Solution Approach 1:
The patent implements feedback control by continuously monitoring the vibration determination index during rolling operations. The control device compares the calculated vibration index against threshold values and automatically adjusts the tension system parameters in real-time to maintain stable operation. This feedback mechanism prevents vibration-induced shutdowns, ensuring reliable continuous production at high speeds
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
The method effectively reduces rolling mill vibrations, improves strip surface quality, and enhances production efficiency by maintaining a stable lubrication state, thus increasing economic benefits for strip production enterprises.
Implementation Method 1
defining an upper threshold of a vibration determination index at an over-lubricated critical point... and a lower threshold of the vibration determination index at an under-lubricated critical point
Data Source
Figure 1
AI summary
The application discloses a tension system optimization method for suppressing vibration of a cold tandem rolling mill. The method aims to suppress vibration occurring in a high-speed rolling process of a cold tandem rolling mill, and provides a rolling machine vibration determination index coefficient for effectively determining whether vibration occurs in a rolling machine. The method employs a target optimization function F(X) such that a mean square error between an optimal value ψ0i of the rolling machine vibration determination index and a vibration determination index ψi of each machine frame acquired in an actual rolling process is at a minimum, and such that a maximum value of the rolling machine vibration determination index coefficient of each individual machine frame is also at a minimum, employs a constraint in which an upper threshold ψi+ of the vibration determination index is acquired during a rolling process in an over-lubricated state in which a neutral angle γi coincides with a bite angle αi and a constraint in which a lower threshold ψi− of the vibration determination index is acquired during a rolling process in an under-lubricated state in which the neutral angle γi is half the bite angle αi, thereby ultimately optimizing a tension system of a rolling process of a cold tandem rolling mill.