Rolled Stock Cooling Simulation for Surface Temperature Limits
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Solution Overview
Problem
In hot rolling mills, the cooling of rolling stock in the intermediate roller table often leads to surface undercooling, which can cause phase transformations and impair product quality, necessitating a method to maintain a minimum surface temperature to prevent such undercooling.
Innovation Solution
A method where each cooling device in the cooling section is assigned a setting value for the coolant flow based on a simulation of the rolling stock's enthalpy and temperature distribution, ensuring the surface temperature does not fall below a predetermined minimum value by quasi-maximizing the coolant flow, thereby preventing undercooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If excessive coolant flow is applied to cool the rolling stock, then cooling efficiency is improved, but phase transformations occur in near-surface areas impairing product quality
Solution Approach 1:
The patent employs a feedback control system where temperature measurements (both bulk and surface) are continuously monitored and used to adjust the coolant flow rate. This closed-loop control ensures that cooling efficiency is maximized while preventing surface undercooling that would cause harmful phase transformations and affect product quality.
2Speed
If the coolant flow rate is increased to achieve desired entry temperature quickly, then cooling speed is improved, but surface undercooling occurs
Solution Approach 1:
The system dynamically adjusts the coolant flow rate during the cooling process rather than applying a constant flow rate. By making the cooling process adaptive and responsive to real-time temperature conditions, the system achieves fast cooling when needed while preventing surface undercooling, thus optimizing both cooling speed and surface temperature control.
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 effectively prevents undercooling of the rolling stock surface, ensuring product quality by maintaining the surface temperature above a minimum value during cooling, thus optimizing the cooling process.
Implementation Method 1
a coolant flow of a coolant can be discharged onto a rolling stock surface of the rolling stock
Implementation Method 2
cooling of a rolled stock in a cooling section arranged upstream of a finishing train
Data Source
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AI summary
The invention relates to a method for cooling a rolled stock (15) in a cooling section (19) arranged upstream of a finishing mill (9) of a hot rolling mill (1), the cooling section comprising at least one cooling device (21, 22, 23) by which a coolant flow of coolant (35) can be discharged onto a surface (29) of the rolled stock (15). In this method, a coolant flow is discharged onto the surface (29) of the rolled stock (29) by means of each cooling device (21, 22, 23) during each passage through the cooling section, and this flow is set to a value assigned to the respective cooling device (21, 22, 23) for that passage.The setpoints for a cooling section passage are determined in a simulation of the cooling section passage such that, in the simulation, certain surface temperatures of the rolled material surface (29) when exiting from effective areas (31, 32, 33) of the cooling devices (21, 22, 23) do not fall below a minimum value for a surface temperature (TS) of the rolled material surface (29).