Hot Rolling Mill Temperature Control via Segmented Cooling
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Solution Overview
Problem
Conventional temperature control devices for hot rolling mills face limitations in achieving precise temperature control and sheet thickness accuracy due to sudden temperature changes near the delivery side, which disrupt auto gauge control and affect product quality.
Innovation Solution
A temperature control device with multiple cooling devices between rolling stands, using entry and delivery side temperature meters, and pressure computing sections to manage cooling water pressure dynamically, ensuring gradual temperature adjustments and preventing sudden changes by shifting the controlled cooling device between adjacent units when pressure limits are reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cooling water flow rate is increased to cool the rolled material faster, then temperature control precision is improved, but sudden temperature changes occur near the delivery side that disrupt auto gauge control and reduce sheet thickness accuracy
Solution Approach 1:
The cooling devices are divided into multiple segments arranged in order from the entry side to the delivery side. Instead of controlling a single cooling device, the system segments the cooling function across multiple devices, allowing gradual temperature reduction without sudden changes that would disrupt sheet thickness control.
Solution Approach 2:
The system dynamically selects which cooling device to control based on the current temperature state and position in the rolling mill. The controlled object is changed from one cooling device to another as the rolled material progresses, enabling adaptive temperature control that prevents sudden temperature changes while maintaining precision.
2Temperature
If cooling device operation is intensified to achieve target temperature, then temperature control is improved, but large temperature changes exert adverse influence on sheet thickness accuracy
Solution Approach 1:
The system performs preliminary cooling actions at upstream cooling devices before the rolled material reaches the delivery side. By anticipating the temperature control needs and applying cooling gradually from the entry side, the system avoids large temperature changes near the delivery side that would adversely affect sheet thickness accuracy.
Solution Approach 2:
The system uses feedback from temperature detection to dynamically adjust which cooling device is controlled. Based on the detected temperature and target temperature, the system determines the appropriate controlled object and cooling water pressure, enabling precise temperature control without causing large temperature fluctuations that would harm sheet thickness accuracy.
3Productivity
If cooling water pressure is increased for effective cooling, then cooling efficiency is improved, but the system reaches pressure limits requiring controlled object changes to maintain continuous control
Solution Approach 1:
The system dynamically changes the controlled cooling device based on pressure limits and cooling needs. When one cooling device reaches its pressure limit, the system transitions control to the next cooling device in sequence, maintaining continuous and effective cooling without exceeding pressure constraints.
Solution Approach 2:
The cooling function is segmented across multiple cooling devices, each operating within its pressure limits. This segmentation allows the system to distribute the cooling load and maintain high cooling efficiency by switching between devices as needed, rather than requiring any single device to operate beyond its pressure capabilities.
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 precise temperature control and auto gauge control, reducing disturbances and improving sheet thickness accuracy, leading to higher quality rolled products.
Implementation Method 1
cooling water is jetted out of the cooling device to cool the rolled material
Implementation Method 2
cooling water is jetted out of the cooling device to cool the rolled material
Data Source
AI summary
A temperature control device for a hot rolling mill, preventing a sudden change in temperature of a rolled material near the delivery side of the rolling mill and realizing precise gauge control. The hot rolling mill has rolling stands arranged in a row and cooling devices for cooling the rolled material. The hot rolling mill is operated so that the cooling devices are preferentially used, in order, from one closest to the entry side until the upper limit pressure is reached. The cooling water pressure of each of the cooling devices is computed based on the target temperature of the rolled material and the actual temperature on the entry side. The cooling water pressure of the cooling device closest to the delivery side of the rolling mill is computed based on the target temperature of the rolled material and the actual temperature on the delivery side so the difference between the target temperature and the actual temperature on the delivery side is minimized.