Cast-Roll Strip Line With Feedback Flatness Control for ≤0.6 mm Steel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current combined casting and rolling systems are inefficient in producing thin steel strips with a thickness of ≤0.6 mm, as they often require additional cold-rolling processes, resulting in high CO2 emissions and lack clear methods for achieving excellent flatness and profile without subsequent cold-rolling.
Innovation Solution
A combined casting and rolling plant with a continuous caster, roughing, intermediate, and finishing trains equipped with actuators and induction furnaces for precise temperature and profile adjustments, along with measuring devices for real-time feedback control, to produce ultra-thin strips with excellent flatness and profile without requiring cold-rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional combined casting and rolling systems are used to produce thin steel strips, then production cost and productivity are improved, but the strips require additional cold-rolling to achieve desired thickness and quality, increasing CO2 emissions and process complexity
Solution Approach 1:
The invention changes the parameters of hot rolling by implementing multi-zone temperature control in the rolling mill, maintaining different temperature zones (e.g., 900-1100°C in front rolls, 700-900°C in back rolls) to enable direct hot rolling of ultra-thin strips without cold-rolling, thus reducing CO2 emissions while maintaining productivity
Solution Approach 2:
The invention performs preliminary actions by equipping rolling stands with profile and flatness actuators that adjust the strand profile before and during rolling, and by controlling the temperature distribution in advance, enabling direct production of high-quality ultra-thin strips without subsequent cold-rolling operations
2Productivity
If conventional combined casting and rolling systems are used, then production cost and productivity are improved, but the geometric properties (flatness and profile) of thin strips cannot be achieved without cold-rolling
Solution Approach 1:
The invention implements feedback control by installing measuring devices (laser profilers, flatness meters) that continuously monitor the strip profile and flatness during hot rolling, with the data fed back to actuators that automatically adjust rolling parameters in real-time to maintain geometric precision
Solution Approach 2:
The invention applies dynamics by using movable and adjustable components including profile actuators that shift rolling rolls laterally, flatness actuators that adjust roll bending, and dynamically controllable temperature zones, enabling real-time adaptation to achieve excellent geometric properties during hot rolling
3Manufacturing precision
If actuators and measuring devices are added to adjust profile and flatness during hot rolling, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The invention applies universality by designing actuators that perform multiple functions - profile actuators that simultaneously control strip profile and position, and flatness actuators that adjust both flatness and tension, reducing the number of separate devices needed while maintaining manufacturing precision
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
Enables the production of ultra-thin steel strips with precise geometric properties and temperature profiles, reducing CO2 emissions by eliminating the need for cold-rolling and ensuring high productivity and cost-effectiveness.
Implementation Method 1
a first induction furnace for heating the sliver to a first rolling temperature
Implementation Method 2
a second induction furnace for heating the intermediate strip to a second rolling temperature
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present invention relates to a cast-roll composite plant for producing a hot-rolled finished strip from molten steel. The object of the invention is to find a novel cast-roll composite plant on which steel strips with a thickness ≤ 0.6 mm, excellent flatness, and an excellent profile can be produced cost-effectively and with high productivity. This object is achieved by a cast-roll composite plant according to claim 1.