Hot-Rolled Steel Cooling Control for Wave Shape Uniformity
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Solution Overview
Problem
Existing methods for cooling hot-rolled steel sheets fail to achieve uniform cooling, particularly when the sheets have a wave shape in the rolling direction, leading to localized cooling due to contact with transportation rolls or aprons, which results in temperature inconsistencies and non-uniform cooling.
Innovation Solution
A cooling apparatus that adjusts the cooling capabilities of the top and bottom surfaces by detecting the temperature phase and wave shape of the steel sheet, allowing for precise control of heat dissipation from both surfaces to ensure uniform cooling, using a combination of thermometers, shape meters, and control devices to manage the amount of heat dissipated from each surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling apparatus sprays cooling water on hot-rolled steel sheet, then cooling is achieved, but uniform cooling cannot be achieved when the sheet has a wave shape due to localized contact cooling
Solution Approach 1:
The invention applies different cooling strategies to different regions of the steel sheet based on its wave shape characteristics. The cooling water spray amount is adjusted locally according to the wave shape phase detected at each position, ensuring that areas with wave contacts receive reduced cooling while other areas maintain normal cooling, thereby achieving uniform overall cooling despite the non-uniform shape
Solution Approach 2:
The invention employs a feedback control system where the wave shape of the steel sheet is detected in real-time during transport, and this detection information is used to dynamically adjust the cooling water spray amount. The control device receives wave shape data, determines the appropriate cooling strategy based on the wave phase, and adjusts the spray amount accordingly, creating a closed-loop control system that adapts to the actual sheet condition
2Productivity
If cooling water spray amount is increased to cool the sheet faster, then cooling efficiency improves, but temperature difference between top and bottom surfaces increases
Solution Approach 1:
The invention distributes cooling water spray to both the top and bottom surfaces of the steel sheet, applying cooling locally to each surface rather than concentrating it on one side. This balanced approach allows for increased overall cooling efficiency while maintaining temperature uniformity between the top and bottom surfaces, as each surface receives appropriate cooling without creating excessive temperature gradients
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 approach enables the uniform cooling of hot-rolled steel sheets by minimizing temperature standard deviation, ensuring consistent cooling across the sheet width and length, even when the sheet has a wave shape, thereby improving the quality and consistency of the steel product.
Implementation Method 1
sprays the cooling water on the top surface of the hot-rolled steel sheet H moving on a run-out table from the top in the vertical direction in a water jet form through a cooling nozzle, and, simultaneously, sprays the cooling water on the bottom surface of the hot-rolled steel sheet H
Implementation Method 2
the portions that locally come into contact with the transportation rolls 220 or the aprons become more easily cooled than other portions due to heat dissipation by contact
Data Source
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AI summary
The apparatus for cooling a hot-rolled steel sheet of the invention includes a thermometer that measures the temperature of the hot-rolled steel sheet; a shape meter that measures a shape of the hot-rolled steel sheet; a top side cooling device that cools a top surface of the hot-rolled steel sheet in a cooling section; a bottom side cooling device that cools a bottom surface of the hot-rolled steel sheet in the cooling section; and a control device that controls at least one of an amount of heat dissipated from the top surface by cooling and an amount of heat dissipated from the bottom surface by cooling of the hot-rolled steel sheet in the cooling section by controlling the top side cooling device and the bottom side cooling device based on temperature measurement results and shape measurement results.