Cold Rolling Emulsion Flow Control for Vibration Suppression
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Solution Overview
Problem
Cold continuous rolling mills face challenges in suppressing vibrations, which affect production efficiency and surface quality due to inadequate control over lubrication states between roll gaps, leading to either slip or increased friction and periodic fluctuations.
Innovation Solution
An emulsion flow optimization method that calculates optimal emulsion flow rates for each rolling stand based on oil film thickness and friction coefficient models, using critical values for over- and under-lubrication states to maintain an optimal lubrication state and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rolling mill speed is controlled to suppress vibration, then vibration defects are reduced, but production efficiency deteriorates
Solution Approach 1:
The invention changes the control parameter from rolling mill speed to emulsion flow rate. By adjusting the emulsion flow rate, the lubrication state in the roll gap is optimized, which suppresses vibration without requiring speed reduction. This resolves the contradiction by finding an alternative control parameter that achieves vibration suppression while maintaining high production efficiency.
2Reliability
If the emulsion flow rate is increased to improve lubrication, then friction coefficient decreases, but slip occurs causing self-excited vibration
Solution Approach 1:
The invention implements a feedback control mechanism where the emulsion flow rate is dynamically adjusted based on the actual lubrication state and vibration conditions. By monitoring the system response and continuously optimizing the emulsion flow rate, the control system maintains the lubrication state within the optimal range, preventing both excessive lubrication (slip) and insufficient lubrication (high friction), thereby eliminating self-excited vibration.
3Reliability
If the emulsion flow rate is decreased to prevent slip, then friction coefficient increases, but oil film rupture occurs causing periodic fluctuation
Solution Approach 1:
The feedback control mechanism monitors the lubrication state and adjusts the emulsion flow rate to prevent oil film rupture. By maintaining the emulsion flow rate within the optimal range, the system ensures sufficient lubrication to keep the oil film intact, avoiding periodic fluctuations caused by film rupture while preventing excessive lubrication that would cause slip.
4Manufacturing precision
If the emulsion flow rate is optimized to suppress vibration, then surface quality improves, but system complexity increases
Solution Approach 1:
The invention focuses on optimizing a single key parameter (emulsion flow rate) rather than implementing a complex multi-parameter control system. By concentrating control efforts on the emulsion flow rate, which has the most significant impact on lubrication state and vibration, the system achieves improved surface quality and vibration suppression with minimal increase in system 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 method significantly reduces vibration defects, improves production efficiency, and enhances the surface quality and stability of the rolling process by optimizing emulsion flow rates, leading to greater economic benefits for enterprises.
Implementation Method 1
the lubrication state between the roll gaps... the friction coefficient... oil film thickness between the roll gaps
Implementation Method 2
the setting of emulsion flow rate directly determines the roll gap lubrication state... average oil film thickness between the roll gaps
Data Source
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AI summary
An emulsion flow optimization method suitable for a cold continuous rolling mill that aims to achieve vibration suppression. Said method aims to suppress vibrations, and by means of an oil film thickness model and a friction coefficient model, an optimum set value of the emulsion flow rate for each rolling stand that aims to achieve vibration suppression is optimized on the basis of an over-lubrication film thickness critical value and an under-lubrication film thickness critical value that are proposed. The described method greatly reduces the incidence of rolling mill vibration defects, improves production efficiency and product quality, treats rolling mill vibration defects, and improves the surface quality and rolling process stability of a finished strip of a cold continuous rolling mill.