Rolling Line Temperature Control During Flying Thickness Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In endless rolling lines, the temperature control of materials during flying thickness change is insufficient due to constraints in speed change and lack of integration of speed patterns in existing temperature control devices, leading to inadequate control of temperature variations.
Innovation Solution
A temperature control device that includes a heating furnace, a mill with multiple stands, a heat exchanger, and thermometers for predictive calculation and feedback control of speed patterns and heat exchanging amounts to maintain target temperatures during flying thickness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the casting speed of the continuous caster is maintained as dominant and constant, then the production stability is improved, but the temperature control accuracy during flying thickness change deteriorates due to inability to adjust speed patterns
Solution Approach 1:
The control device executes predictive calculations before the flying thickness change occurs to determine the required speed change amounts and heat exchanging adjustments. This preliminary action allows the system to prepare control parameters in advance, ensuring temperature accuracy is maintained even though the casting speed remains dominant and constant.
Solution Approach 2:
The control device incorporates feedback mechanisms that monitor actual temperature deviations during flying thickness change and use this information to refine speed pattern adjustments and heat exchanging control, thereby improving temperature control accuracy while maintaining production stability.
2Productivity
If the speed of rolling material is kept constant in the delivery side of finishing mill, then the production efficiency is improved, but the temperature control capability deteriorates when speed adjustment is needed for flying thickness change
Solution Approach 1:
The control device introduces dynamic speed patterns that allow temporary speed adjustments during flying thickness change while maintaining constant speed during normal operation. This dynamic approach enables the system to adapt temperature control capabilities when needed without sacrificing overall production efficiency.
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 solution enables precise control of temperatures for both preceding and succeeding materials within permissible ranges by predicting speed changes and adjusting heat exchanging amounts, improving temperature control accuracy.
Implementation Method 1
a heat exchanger which is disposed downstream of the mill and/or between the stands of the mill, and is configured to exchange heat with at least one of the material to be rolled after rolling by the mill and the material to be rolled during rolling by the mill
Data Source
AI summary
In an endless rolling line, a speed of a material to be rolled changes with a flying thickness change. A temperature control device executes predictive calculation of a speed change amount of the material to be rolled associated with the flying thickness change and updates a speed pattern. The temperature control device executes feedforward control of an amount of a coolant to cool the material to be rolled based on a latest speed pattern and a measured temperature value of the material to be rolled in an entry side of the heat exchanger. In parallel with the feedforward control, the temperature control device executes feedback control of coolant volume based on an error between the measured temperature value of the material to be rolled in the delivery side of the heat exchanger and a target value.