Hot Rolling Cooling Control for Precise Finisher Entry Temperature
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Solution Overview
Problem
The existing hot rolling lines lack an effective method to control the temperature of materials as they enter the finisher mill, leading to inconsistencies and inefficiencies in the rolling process.
Innovation Solution
A system and method that utilize a control device to manage the flow of coolant water in the cooling equipment between the rougher mill and the finisher mill, employing set-up calculations, feedforward control, and learning algorithms to predict and maintain the desired temperature of the material at the finisher entry side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the material temperature is set to a sufficiently high temperature at the heating furnace, then the rolling process can be stably performed, but the finisher entry-side temperature cannot be precisely controlled within a narrow range
Solution Approach 1:
The cooling equipment is operated in advance during the rougher rolling process to pre-cool the material, so that when the material enters the finisher mill, its temperature is already within the desired narrow range. This preliminary cooling action enables precise temperature control at the finisher entry side without compromising rolling stability.
Solution Approach 2:
A temperature measurement device measures the actual temperature of the material at the finisher entry side, and this measured value is fed back to the control device. The control device then adjusts the cooling equipment's operation based on the difference between the measured temperature and the target temperature, enabling precise closed-loop temperature control.
2Temperature
If water cooling is applied to control the finisher entry-side temperature, then temperature reduction is achieved, but the cooling characteristics are difficult to predict quantitatively
Solution Approach 1:
The system uses real-time temperature measurement at the finisher entry side and feeds this information back to the control device. The control device continuously adjusts the cooling water flow based on the actual temperature deviation, compensating for the unpredictable nature of water cooling and achieving accurate temperature control despite variable cooling characteristics.
Solution Approach 2:
The control device dynamically changes the cooling water flow parameters (flow rate, timing, duration) based on the measured temperature and material characteristics. By adjusting these parameters in real-time, the system adapts to varying cooling characteristics and maintains accurate temperature control.
3Force
If the finisher rolling is performed at high temperature to reduce rolling load, then the rolling load is reduced, but the temperature control range becomes too broad
Solution Approach 1:
The cooling equipment is activated during the rougher rolling process to pre-cool the material before it enters the finisher mill. This preliminary cooling action reduces the temperature by a controlled amount, allowing the finisher rolling to be performed at an optimized temperature that balances rolling load reduction with precise temperature control within a narrow range.
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 allows for precise control of the finisher entry-side temperature, improving the accuracy and consistency of the rolling process, and enhancing the ability to handle challenging materials like ultrathin products.
Implementation Method 1
a cooling equipment for cooling the material to be rolled using coolant water
Implementation Method 2
cooling characteristics of water cooling including a heat transfer coefficient
Implementation Method 3
a rougher delivery-side pyrometer provided between the rougher mill and the intermediate equipment group, a finisher entry-side pyrometer provided between the finisher mill and the intermediate equipment group
Data Source
AI summary
A hot rolling line includes a rougher mill, a finisher mill, an intermediate equipment group, a rougher delivery-side pyrometer, a finisher entry-side pyrometer, and a control device. The intermediate equipment group includes a cooling equipment. The control device includes a set-up calculation device configured to determine a flow amount set-up value of the coolant water in the cooling equipment, a feedforward control device configured to perform feedforward control of a flow amount of the coolant water in the cooling equipment based on the flow amount set-up value, and a learning device configured to calculate a learning value based on a flow amount measured value of the coolant water in the cooling equipment and a finisher entry-side temperature measured value indicating a measured value of the material to be rolled measured by the finisher entry-side pyrometer.