Coiled Metallic Strip Microstructure Prediction During Cooling
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Solution Overview
Problem
Existing microstructure models for metallic strips during hot rolling and cooling fail to accurately predict and control the final microstructure properties across the entire coil, leading to non-uniform mechanical properties due to incomplete transformation processes and complex heat transfer conditions, necessitating costly safety margins and limiting process optimization.
Innovation Solution
A computational method determines the microstructure properties of the entire wound strip by analyzing temperature and stress profiles of individual strip turns, using a microstructure model that incorporates coil cooling processes, allowing for precise adjustments of cooling parameters to achieve uniform microstructure across the strip's length and width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cast strip is used as a substrate, then production efficiency is improved, but the surface quality is insufficient and requires additional coating processes
Solution Approach 1:
The substrate is pre-treated with an anchor layer (e.g., chromium oxide, titanium oxide, or silane coupling agents) before coating. This preliminary surface preparation creates a roughened or chemically active surface that enhances adhesion of subsequent functional coatings, thereby achieving good surface quality while maintaining the production efficiency of cast strip substrates.
2Manufacturing precision
If conventional coating processes are used, then surface functionality is achieved, but production time increases and productivity decreases
Solution Approach 1:
Multiple coating operations are combined into a single continuous coating pass. The apparatus applies multiple layers or different types of coatings simultaneously in one continuous process, eliminating the need for separate coating steps and intermediate handling, thus maintaining surface functionality while significantly reducing production time.
Solution Approach 2:
The coating process is made continuous rather than batch-wise. The substrate moves continuously through the coating apparatus, with coatings applied in a single uninterrupted pass. This eliminates stopping and starting between coating operations, maintaining high productivity while achieving the required surface functionality.
3Manufacturing precision
If multiple separate coating processes are used, then comprehensive surface functionality is achieved, but device complexity and production time increase
Solution Approach 1:
The coating apparatus is designed as a multi-functional device that can apply different types of coatings (e.g., adhesive layers, functional coatings, protective layers) in a single integrated system. Different coating heads or spray nozzles are incorporated into one apparatus, allowing comprehensive surface functionality to be achieved without requiring multiple separate coating processes.
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 precise prediction and control of microstructure properties, ensuring consistent mechanical properties across the strip, reducing the need for safety margins and optimizing the production process for homogeneous product quality.
Implementation Method 1
a coating apparatus which comprises a rotating member which rotates about a center of rotation, and a coating unit which supplies a coating material to be coated on the substrate while the rotating member rotates
Data Source
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AI summary
The invention relates to a method for producing a metallic strip (1) in which the strip (1) is first rolled in a rolling mill (2) in the conveying direction (F) and subsequently cooled in a cooling section (3), after which the strip (1) is wound onto a reel (4) to form a coil, wherein the microstructure properties of the strip (1) are determined by a computational microstructure model.In order to improve the quality of the strip and in particular to be able to predict the microstructure of the strip more accurately over its length and width, the invention provides that the determination of the microstructure properties of the strip (1) is carried out using the microstructure model for the strip wound into a coil, by first determining the temperature (T) and/or the stress (σ) only for a section (5) of the wound strip (1) and using it as the basis for the microstructure model, and then determining the microstructure properties of the entire wound strip (1) by joining the individual sections (5) of the wound strip (1).